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A review on sheet erosion measurements in Hungary

Authors:
  • Geographical Institute Research Centre for Astronomy and Earth Sciences
  • Research Centre for Astronomy and Earth Sciences

Abstract and Figures

Soil erosion has a significant role in ecology, economy and in environmental protection therefore its quantification and prediction are very important, particularly on a national level. Although some details can be described using physical equations, the entire soil erosion process is rather complicated and can be determined only empirically, which requires large measured datasets. Because plot measurement is the most convenient and therefore the most popular way of capturing erosion data, we used plot measurement to understand erosion in Hungary. The northern and the western parts of the country are endangered by sheet erosion, which is why the plots were carried out in those areas. Most of the plots were constructed to determine the " K " factor of the USLE (Universal Soil Loss Equation) under permanently tilled soils without vegetation cover. Additionally the soil protection effect of various field crops and the additional land use types (forest, pasture) was measured in the plots. Furthermore descriptive investigations, rainfall simulations and soil tracer detections were also used to quantify sheet erosion at different environmental conditions and scales. Despite the large amount of measured data collected, only a few of them have since been published. Due to a lack of available data, national erosion research, erosion prediction, and model calibration are less precise and effective Scaling problems among the measured levels also emphasized a definite need for a larger and more accessible national database. Finally, without the financial base of additional plot measurements, the publication of the previously gathered data is absolutely necessary to continue soil erosion studies in Hungary.
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A REVIEW ON SHEET EROSION MEASUREMENTS IN HUNGARY
JAKAB Gergely1, SZABÓ Judit2, SZALAI Zoltán1,2
1Geographical Institute RCAES, HAS
Budaörsi út 45., 1112 Budapest e-mail: jakab.gergely@csfk.mta.hu
2Dept. of Environmental and Landscape Geography, Eötvös Loránd University
Pázmány Péter sétány 1/C., 1117 Budapest, Hungary
Keywords: soil loss, scaling, methodological diversity, national database
Abstract: Soil erosion has a significant role in ecology, economy and in environmental protection therefore its
quantification and prediction are very important, particularly on a national level. Although some details can be
described using physical equations, the entire soil erosion process is rather complicated and can be determined
only empirically, which requires large measured datasets. Because plot measurement is the most convenient and
therefore the most popular way of capturing erosion data, we used plot measurement to understand erosion in
Hungary. The northern and the western parts of the country are endangered by sheet erosion, which is why the
plots were carried out in those areas. Most of the plots were constructed to determine the “K” factor of the USLE
(Universal Soil Loss Equation) under permanently tilled soils without vegetation cover. Additionally the soil
protection effect of various field crops and the additional land use types (forest, pasture) was measured in the
plots. Furthermore descriptive investigations, rainfall simulations and soil tracer detections were also used to
quantify sheet erosion at different environmental conditions and scales. Despite the large amount of measured
data collected, only a few of them have since been published. Due to a lack of available data, national erosion
research, erosion prediction, and model calibration are less precise and effective Scaling problems among the
measured levels also emphasized a definite need for a larger and more accessible national database. Finally,
without the financial base of additional plot measurements, the publication of the previously gathered data is
absolutely necessary to continue soil erosion studies in Hungary.
Introduction
Soil erosion is a global problem that affects—with varying intensity—most of the cultivated
areas of the world. The pressures of an increasing population have led both to food that is
produced intensively on existing farmland and to the involvement of new areas into intensive
tillage operations (RHODES 2014). Consequently, since soil is a conditionally renewable re-
source, soil erosion hazards can be a ticking time bomb for a country’s security.
The success of avoiding and remediating soil erosion depends on the detailed
knowledge of the sub-processes involved in erosion. Useful models are accessible only when
large amounts of measured results are available.
Since soil erosion is a rather complex phenomena contingent on the temporary interac-
tions of various environmental parameters, even the basic processes vary within a particular
area. To apply a general and adequate soil erosion model in the landscape and to gain the best
results, it must be calibrated and validated with local data first. Accordingly the very best soil
erosion model can present inadequate results because of the lack of previous calibration and
validation. Therefore each country has almost a responsibility to gather as much and as high
quality place-specific erosion data as it is possible.
The case of Hungary is very unique from this point of view because two thirds of the
country is used agriculturally and widespread loose sediment parent material makes the soils
especially prone to erosion. Although the area of the country (ca. 93,000 km2) is smaller than
the average traditionally agricultural country in the EU, a wide range of erosion processes can
be found and often parallel to each other. The flatter, continental parts of Hungary are often
afflicted by wind erosion and even by "berm erosion" on salt affected alkali flats (TÓTH et al.
2015), while the hilly parts are eroded by both sheet and gully erosion. The varying landscape
and climate results in a rather complex mosaic pattern of soil erosion processes with very high
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90 JAKAB G., SZABÓ J., SZALAI Z.
spatial diversity (CENTERI 2002c, KERTÉSZ and CENTERI 2006). This spatial diversity makes
the up- and downscaling of the measured data considerably difficult both over time (DE
VENTE and POESEN 2005) and among scales (STROOSNIJDER 2005).
The aim of this paper is to review the efforts of soil erosion measurements in Hungary
and compare the published results. To do so, the focus is solely on sheet erosion, even though
gully (JAKAB et al. 2009, KERTÉSZ and JAKAB 2011), wind (NÉGYESI et al. 2014) and fluvial
(SZALAI et al. 2013) erosion also have a very important impact on recent landscape develop-
ment of Hungary.
Measuring soil erosion
Most of Hungary’s soil erosion history has occurred from natural phenomena and is of limited
interest to this study. However anthropogenic soil erosion events and processes have in-
creased in the last century due to intensive farming practices (SZILASSI et al. 2006). Therefore
soil loss as a potential danger, rising in the 20th century, directed attention to erosion process-
es. From a theoretical standpoint the history of soil erosion research was divided to three main
groups by the authors described below: (1) descriptive studies, (2) process oriented studies,
(3) complex studies. This classification is subjective reflecting the progressive attitude of man
to the nature over time.
Descriptive studies
In the first part of the 20th century soil erosion was considered more of a cause of recent land-
scape morphology rather than a process, which detaches soil particles and moves them else-
where. Because of this common consideration, a detailed survey of the current status of soil
erosion in Hungary seemed to be more prescient than investigations of the processes of its
present soil erosion. Results of the survey were soil erosion maps constructed and produced at
various scales from national (DUCK 1960, STEFANOVITS 1964) to larger scales (DUCK 1966,
ÁDÁM 1967). Additionally, case studies were carried out in order to measure nutrient distribu-
tions along different slopes due to sheet erosion on various soil types (MATTYASOVSZKY and
DUCK 1954).
At that time, soil erosion was considered as an effect, which mitigated soil fertility
hence caused economical damages. Its role as an environmental hazard had not yet been rec-
ognized. On the other hand the role of human activity was identified as the main purpose of
accelerated erosion increase. Consequently significant efforts were made for erosion preven-
tion and soil protection theories and practices (FEKETE 1953).
Although process oriented investigations have become more popular since the 70s, de-
scriptive studies were still popular. In that time KERÉNYI (1984a) introduced a new way of
soil erosion surveying and mapping in which he took rill and gully erosion into account in
order to determine the real rate of accumulated soil loss. Since this type of survey needed sig-
nificantly more effort it did not become widespread.
Process oriented studies
While descriptive investigations increased a need arose to understand the processes involved
in generating soil erosion. This led to increasing attention being paid to monitoring and mod-
elling studies. Soil erosion monitoring was carried out with the construction of measuring
equipment that could quantify runoff and soil loss values due to natural precipitation events.
These techniques aimed at measuring soil losses at different spatial scales since it became
A review on sheet erosion measurements in Hungary 91
evident right away that the results of different scales are hardly comparable to each other
(STROOSNIJDER 2005).
The small-scale investigations were based on monitoring sediment traps at catchment
outlets (SZŰCS 2012), creeks or rivers (DEZSÉNY and LENDVAI 1986). In the 80s the water
quality of Lake Balaton—because the lake was a very popular destination—decreased dramat-
ically, becoming a major problem. Although water pollution was partly due to the lack of
sewerage, attention was focused on the erosion processes in the Balaton watershed (DEZSÉNY
and LENDVAI 1986). At this point in time measurements were concentrated on the surface
water quality of the streams in the catchment in which phosphate received the primary interest
(MÁTÉ 1987).
In the early 90s, a country wide catena scale monitoring program was designed and
partly constructed by the National Soil Monitoring Network (TIM) (VÁRALLYAY 1994). In
this study metal sheets of 1 m2 were placed into the soil at exactly 60 cm from the surface
parallel to various geomorphological positions—mainly on ridges, footslopes and midslopes.
The changes of soil depth above the metal sheet referred the dynamics of erosion or deposi-
tion processes (NOVÁKY 2001). Although in this study the construction took the main part of
the budget—maintenance being nearly negligible—monitoring stopped because of financial
difficulties. Moreover there are very limited data published from the short monitoring period
(18 stations, 3 slope positions and 3 recording times). These data partly reflect the obscurity
of the first year results manifested in a few cm changes in both directions at the same place
(NOVÁKY 2001).
Plot measurements
Measuring in situ soil erosion this method is currently the most widespread of the world.
Many sites can be found in Europe with large amounts of published data (VACCA et al. 2000,
JANKAUSKAS and JANKAUSKIENE 2003, CERDAN et al. 2006, GONZÁLEZ-HIDALGO et al. 2007) and
many countries neighboring Hungary have well documented monitoring results such as Ro-
mania (IONITA et al. 2006), Slovakia (STANKOVIANSKY et al. 2006) and Slovenia (HRVATIN et al.
2006). Theoretically plot measurement can provide data on a wide variety of scales even
though data is typically recorded at micro and smaller scaled investigations (STROOSNIJDER
2005).
Hungary is situated on the border of 3 climatic zones therefore the whole country can-
not be described as one unit. The SE part (The Great Plain) is continental and has the least
amount of precipitation (less than 500mm year-1) and a high yearly mean temperature fluctua-
tion (20°C). The Western part is the wettest while the SW has a slight Mediterranean influ-
ence (DÖVÉNYI 2010).
The size of the published plots varies from 2 to 1200 m2 due to different purposes
(KAZÓ (1966a) reported about the advantages and disadvantages of in situ measurements on
various plot sizes). In accordance with topography and pedology the most endangered spots
can be found mainly in the western and the northern parts of the country (KERTÉSZ and
CENTERI 2006) (Figure 1). In these areas the soils concerned are Luvisols and Lithosols on the
higher parts and Cambisols on the hills. The most investigated land use type is arable land,
especially black fallow or continuous seedbed conditions, however, forest cover has also been
investigated (BÁNKY 1959b).
92 JAKAB G., SZABÓ J., SZALAI Z.
Figure 1. Location of plot measurements in Hungary
1. ábra A parcellás mérések elhelyezkedése hazánkban
The appearance of the USLE concept (WISCHMEIER and SMITH 1978) provided a
standard way for sheet erosion measurement. Its high efficiency was associated with easy
applicability, which is why the USLE method became widely accepted even in Hungary be-
hind the iron curtain. Although considerable more plot measurement data was registered and
stored this study focuses on only ten locations on the basis of seventeen publications. Most of
the measured data are still unavailable since they manifested only in manuscripts even though
some of them contain data that covers long periods of time (more than 10 years continuous
monitoring).
Some of the sources present single precipitation induced runoff and soil loss values,
other reveal derived values (e.g. soil erodibility (K) factor from the USLE) (Table 1). A
common problem in sources from former times was the exchangeability and comparability of
the presented data due to the lack of certain precipitation parameters or soil bulk density. The
bulk density of soil loss is generally much less than that of the in situ soil, hence soil loss val-
ues presented in bulk units are hardly comparable to those of weight units.
The most accepted calculation methods concern an annual period even though often a
few precipitation events result almost in the total amount of annual soil loss. This phenome-
non is typical for semiarid regions such as the Mediterranean but due to climate change it is
becoming even more frequent even in Hungary. Accordingly the same sediment gathering
infrastructure has to collect and store sediment and soil loss of various orders of magnitude.
This is why there is no completely accepted and widespread sediment collector equipment in
Hungary—even the most up to date devices can not handle extreme events, which often caus-
es data loss.
Table 1. Plot measurement properties in Hungary The presented values are means. (K: soil erodibility factor of the USLE; R: rain
erosivity factor of the USLE; A: soil loss; RR: runoff rate; question mark refers to ambiguous data)
1. táblázat Magyarországi parcellás eróziómérések A pulikált eredmények átlagok. (K: USLE erodálhatósági tényez; R: USLE
esenergia tényez; A: talajveszteség; RR: lefolyási ráta; a kérdjel kétes adatot jelöl)
Location Purpose
Plot size
(m)
No of
plots Soil Land use
Moni-
toring
period
Slope
steepness
(%)
Published results
Source
Csákvár USLE
K factor 1×8 10
Regosols
Leptosols Black fallow 1990-
1997 14 K values for five soils KERTÉSZ and RICHTER 1997;
KERTÉSZ et al. 2004,
Visz USLE
K, C factors 2×22 4 Cambisol
Black fallow
Pasture 1999 9 K=0.034 TÓTH et al. 2001.
Kisnána Erodibility various 6? Luvisol Forest 1958-
2009 ? Results of single events BÁNKY 1959a
Szent-
györgyvár
Tillage com-
parison 24×50 4 Luvisol Arable land
2003-
2009 9 Annual runoff and soil loss
values
BÁDONYI et al. 2008; KER-
TÉSZ et al. 2007
KERTÉSZ et al. 2010
Madarász et al. 2011
Püspök-
szilágy
USLE
K factor 22 4
Cambisol &
Luvisol Black fallow 2000 9 Results of single events BALOGH et al. 2003
Bátaapáti USLE
K factor 2×22 2 Leptosol Black fallow 2006 9 K=0.2, A=30 t ha-1, R=140 kJ
m-2 mm h-1 BALOGH et al. 2008
Pilismarót Erodibility various 6 Luvisol Arable land
1982-
1985 14-23 RR=0.04; A= 10.2 g m-2 GÓCZÁN & KERTÉSZ 1988,
1990; KERTÉSZ 1987
Bakonynána Erodibility various 6 Luvisol Arable land 1976-
1984 18-29 RR=5.6
KERTÉSZ and GÓCZÁN 1990;
GÓCZÁN and KERTÉSZ 1988
Abaújszántó Geotextil effect 2×10 16 Cambisols Vineyard
Orchard
2007-
2008 10-20 K= 0.002; 0.004; 0.035 KERTÉSZ et al. 2007b,c
Károlyfalva Erodibility 0.8×2.5 4 Cambisol Black fallow 1986 18 Results of single events KERÉNYI 1991, 2006
Pátka Model calibra-
tion
2×20
1.8×60 3 Cambisol
Chernozem
Arable field
Vineyard
Orchard
1999-
2002 4-13 Results of single events BARTA 2004
93
94 JAKAB G., SZABÓ J., SZALAI Z.
The most adequate database among the investigated sources is based on the Csákvár
experimental station (Figure 2). The K factor for five representative soils of the Lake Balaton
catchment was determined over several years. Four soil types were transported to the station
in order to equalize climatic conditions. Each investigated soil was originally shallow, there-
fore after the settlement of the replaced soil the circumstances were the same as in the in situ
locations (KERTÉSZ and RICHTER 1997). Eight years of measurement was calculated into eight
separate K factor values for each of the five investigated soils (KERTÉSZ et al. 2004).
Figure 2. Measured K values on Csákvár station (A: Lithosol, sandy silt; B: Cambisol, silty sand; C: Cambisol
silty clay; D: Rendzina silty clay; E: Cambisol silty clay) After KERTÉSZ et al. (2004)
2. ábra Mért K értékek a Csákvári Állomásról (A: Köves sziklás váztalaj, homokos vályog; B: Váztalaj homok;
C: Földes kopár agyag; D: Lejtőhordalék agyag; E: Rendzina silty clay) KERTÉSZ et al. (2004)
Presumably the database measured at the Kisnána station contains the highest amount
of data, however it has yet to be published. On the basis of the available data here, no valuable
calculations or comparisons can be made.
Some parts of the data measured at Szentgyörgyvár are published both in a detailed
rough format and in a summarized format (Table 2), hence they are not particularly applicable
for further calculations or comparisons (BÁDONYI et al. 2008, KERTÉSZ et al. 2007, KERTÉSZ
et al. 2010). Moreover the main parts of the database are still unavailable for the scientific
community.
1990 1991 1992 1993 1994 1995 1996 1997
Plot A 0,031 0,037 0,049 0,035 0,004 0,023 0,024 0,012
Plot B 0,036 0,069 0,076 0,111 0,012 0,042 0,060 0,005
Plot C 0,035 0,034 0,032 0,041 0,006 0,008 0,012 0,004
Plot D 0,001 0,021 0,027 0,022 0,007 0,017 0,030 0,003
Plot E 0,044 0,172 0,060 0,192 0,036 0,029 0,141 0,027
0,00
0,02
0,04
0,06
0,08
0,10
0,12
0,14
0,16
0,18
0,20
K-factor
years
A review on sheet erosion measurements in Hungary 95
Table 2. Main measured parameters on the Szentgyörgyvár site. (R: USLE erosivity factor; Dep: deposited soil
loss; Susp: suspended soil loss) After BÁDONYI et al. 2008 and MADARÁSZ et al. 2011
2. táblázat Szentgyörgyvári Állomás által mért főbb adatok . (R: USLE esőenergia tényező; Dep: ülepedő talaj-
veszteség; Susp: lebegtetett talajveszteség) BÁDONYI et al. 2008 és MADARÁSZ et al. 2011 alapján
Year R Tillage Runoff Runoff
rate
Dep. Susp. Total Soil
loss
kJ m-2 mm h-1 m
3 ha-1 kg ha-1 kg ha-1 kg ha-1
2004 51.34
Conventional 15.458 0.010 57 9 67
Minimum 2.708 0.002 3 2 5
M/C % 17.5 17.5 5.3 20.9 7.5
2005 173.35
Conventional 892.127 0.290 4542 264 4806
Minimum 342.531 0.111 101 74 175
M/C % 38.4 38.4 2.2 28 3.6
2006 40.24
Conventional 448.631 0.015 7331 591 7922
Minimum 110.44 0.005 1.1 64 165
M/C % 24.6 35.9 1.4 10.8 2.1
Mean for
2007-2009 n.a.
Conventional 26.2 0.04 n.a. n.a. 1540
Minimum 9.4 0.014 n.a. n.a. 580
M/C % 35.9 35 n.a. n.a. 37.7
The published parts of the erosion measurements carried out at Bátaapáti and
Püspökszilágy are short-term case studies. Since the data issued are separated and point scale,
both in time and space, the usage of these measurements are limited.
Plot measurements taken place next to Abaújszántó were aimed to quantify the role of
organic geotextiles in soil protection (JAKAB et al. 2012), moisture conservation (KERTÉSZ et
al. 2011) and erosion control (Table 3).
Table 3. Main result of biological geotextiles covered plot measurements at Abaújszántó 2006-2008
3. táblázat Geotextillel fedett parcellák mért értékei Abaújszántón 2006-2008
Orchard Espalier vineyard
Traditional vine-
yard
Jute Un-
covered Jute Borassus Buriti Un-
covered Jute Un-
covered
Soil loss (t ha-1 year-1) 0.56 2.63 5.29 2.83 6.67 24.83 0.12 0.13
K (t h MJ-1 mm-1) n.a. 0.0045 n.a. n.a. n.a. 0.0427 n.a. 0.0002
P 0.21 n.a. 0.21 0.11 0.27 n.a. 0.98 n.a.
Runoff mm year-1 7.1 9.5 13.7 17.2 11.2 29.0 7.5 6.3
Runoff rate 0.013 0.017 0.025 0.036 0.023 0.053 0.014 0.011
Some of data measured next to Pilismarót and Bakonynána are published in a single
storm resolution, however the database seems to be incomplete in terms of the lengths of the
measuring period. The presented values are often difficult to compare due to the lack or insuf-
ficiency of certain parameters such as surface coverage. The annual summaries have not yet
been calculated and because of the length of the elapsed time it is unlikely they will ever be.
Although runoff and soil loss results measured at Pátka were of high quality, even for soil
erosion prediction model building (BARTA 2004), they were not available for further calcula-
tions. Similarly the database built at Károlyfalva seems to contain very useful data but neither
the literature, the rough database or the calculated values are available.
96 JAKAB G., SZABÓ J., SZALAI Z.
Rainfall simulation studies
Plot measurement results hardly depend on recent climatic conditions. In the absence or
abundance of some certain types of precipitation that occurred under a special soil condition,
the measured annual values can differ remarkably from each other. Hence the gained results
are comparable only with limitations. To ensure the possibility of a better comparison artifi-
cial precipitation forming devices were needed. Reflecting this need the first rainfall simulator
was designed and constructed parallel to the global trend and the first plot constructions in
Hungary by MATTYASOVSZKY (1953) in the 50s and KAZÓ (1967) in the 60s.
Table 4. Rainfall simulator studies in Hungary
4. táblázat Eső-szimulátoros vizsálatok Magyarországon
Type of simulator Plot size Purpose of using a rainfall
simulator Source
Rotating Drop former, field 0.25 m2 Infiltration, water management KAZÓ 1966b
Rotating Drop former, field 0.25 m2 Soil erodibility KAZÓ 1967
Rotating Drop former, lab 0.25 m2 Splash erosion KERÉNYI 1982, 1984b,
1986
Individual drop former, field 8 m2 Soil erodibility KERTÉSZ and RICHTER
1997
Alternating Nozzle type, field 12 m2 Soil erodibility CSEPINSZKY et al. 1998
Alternating Nozzle type, field 12 m2 Soil erodibility, infiltration CSEPINSZKY et al. 1999a-b
Alternating Nozzle type, field 12 m2 Soil erodibility, infiltration CSEPINSZKY and JAKAB
1999
Alternating Nozzle type, field 12 m2 Soil erodibility CENTERI et al. 2001
Alternating Nozzle type, field 12 m2 Soil erodibility, soil loss predic-
tion
CENTERI 2002a
Alternating Nozzle type, field 12 m2 Soil erodibility, crop rotation CENTERI 2002b
Alternating Nozzle type, field 12 m2 Soil erodibility CENTERI 2002c
Alternating Nozzle type, field 12 m2 Soil erodibility CENTERI et al. 2002
Alternating Nozzle type, field 12 m2 Soil erodibility, crusting impact KERTÉSZ et al. 2002
Fix Nozzle type, field 10 m2 Phosphorus loss, erodibility AZAZOGLU et al. 2003a,b
Alternating Nozzle type, field 12 m2 Soil erodibility CENTERI 2003
Alternating Nozzle type, field 12 m2 Soil erodibility CENTERI and PATAKI 2003
Alternating Nozzle type, field 12 m2 Soil erodibility, infiltration SCHWEITZER et al. 2003
Alternating Nozzle type, field 12 m2 Model comparison CENTERI et al. 2004
Alternating Nozzle type, field 12 m2 Soil erodibility, infiltration JAKAB 2004
Fix Nozzle type, field 10 m2 Phosphorus loss, comparison of
simulators
SISÁK et al. 2004a,b
Alternating Nozzle type, field 12 m2 Soil erodibility CENTERI et al. 2005
Alternating Nozzle type, field 12 m2 Soil erodibility, infiltration JAKAB and SZALAI 2005
Alternating Nozzle type, field 12 m2 Soil erodibility, Canopy effect SZŰCS et al. 2006
Individual drop former, lab. 0.5 m2 Karst corrosion ZÁMBÓ and WEIDINGER
2006
Fix Nozzle type, field 0.25 m2 Soil erodibility, tillage effect KERTÉSZ et al. 2007
Fix Nozzle type, field 10 m2 Phosphorus loss STRAUSS et al. 2007.
Alternating Nozzle type, field 12 m2 Soil erosion, canopy effect BALOGH et al. 2008
Alternating Nozzle type, field 12 m2 Model comparison CENTERI et al. 2009
Fix Nozzle type, field 10 m2 Rill initiation HAUSNER and SISÁK
2009a,b
Fix Nozzle type, field 10 m2 Model calibration HAUSNER 2010
Alternating Nozzle type, field 12 m2 Crusting, SOC erosion JAKAB et al. 2013
Fix Nozzle type, lab. 0.5 m2 Aggregate erosion, crusting SZABÓ et al. 2015
Artificial rainfall simulation has many advantages. It makes the investigations cost-
effective, thus theoretically any type of rainfall characteristic can be applied at any time and
any place. The purpose of usage also widely varies. In addition to soil loss, runoff and infiltra-
A review on sheet erosion measurements in Hungary 97
tion studies, the device is also perfect for measurements on splash erosion, nutrient move-
ments, contamination leaching, sealing, crusting, organic carbon degradation, and karst corro-
sion (Table 4). Rainfall simulation studies in Hungary were reviewed in detail by CENTERI et
al. (2010).
Descriptive investigations for process estimations
A detailed survey of an area can provide much more information than simply the degree of
soil erosion at various spots. The spatial distribution can be compared to other databases such
as (1) to other areas comparing the missing or deposited soil values at definite geomorpholog-
ic sites; or (2) to the same area from another time. Additionally, if they are well documented,
spatial comparisons can be done by applying individual studies from a wide range of pub-
lished investigations. On the other hand, for temporal comparisons, repeated surveys or stand-
ardized estimated initial conditions are needed on the same location, which are generally cre-
ated by the same research staff.
Tracer detections
Tracers are very useful tools for soil redistribution investigations. Most of the materials can
act as a tracer in soil replacement detection, however some artificial materials are more suita-
ble than others. Since Hungary is located close to the Ukraine fallout from the nuclear acci-
dent at Chernobyl nearly contaminated the whole territory of the country as much. Cs-137
detection in soil redistribution therefore can provide soil loss and landscape evolution data
both in hillslope (CSEPINSZKY et al. 1999c) and catchment scale (DEZSŐ et al. 2004; KERTÉSZ
and JAKAB 2011). Results demonstrated that soil loss of an ordinary transdanubian catchment
of 100 km2 originated partly from subsoil due to gully erosion (~50%) and partly from topsoil
due to sheet erosion (50%) (JAKAB et al. 2009).
Retrospective estimates of deposition processes show that many chemical soil parame-
ters can be used such as high phosphate content (CENTERI 2010), mineralogical composition
(NAGY et al. 2012), CaCO3 or soil organic matter (JAKAB et al. 2014). These studies report a
relatively high deposition rate at the footslope position (generally more than two meters),
however the exact volume of soil loss along the investigated hillslope could only be estimat-
ed.
For detailed analytical investigations the in situ, real time artificial contamination
methods are more applicable than the retrospective ones. For tracers rear earth oxides are used
to determine the effects of erosion and tillage. This technique is not widespread in Hungary,
however TÓTH (2015) presented preliminary results from rear earth oxide distribution results
due to erosion under various tillage systems in Zala county.
Remote sensing
The use of aerial photographs for surveying soil erosion in Hungary dates back to 1966. MIKE
(1966) tried to emphasize the advantages of this method compared to the traditional field sur-
vey, however, she focused mainly on gully erosion. As the calculation capacity of computers
increased, remote sensing image interpretations became generally available even for sheet
erosion surveys. VERŐWOJTASZEK (1996) compared calculated USLE soil loss categories
to those interpreted from landsat images for a tilled sample field of 200 ha. The highest differ-
ences (37% both) were found in the soil loss categories of 5-10 t ha-1 and 15< t ha-1, while the
ratio of the area classified to the same category was only 11%. The difficulties mentioned
were the disturbing influence of differences in plant coverage. A few years later VERŐ
98 JAKAB G., SZABÓ J., SZALAI Z.
WOJTASZEK and BALÁZSIK (2008) published soil erosion map results derived from remote
sensing images for a whole catchment (~ 120 km2). These results were validated using field
samples. The authors reported that changes in soil quality were detected even under vegeta-
tion coverage. Nevertheless this method cannot be automatized as the identification of learn-
ing areas is valid for only one image, hence changes in soil moisture content, soil status or
vegetation cover can change soil radiation dramatically.
Complex studies
In complex studies the descriptive investigation is generally completed with analytical and/or
historical data describing the complex process that formed the present landscape. SZILASSI et
al. (2006) investigated the role of land use change in the fluctuating intensity of soil erosion at
a small catchment in the Balaton region and concluded that land use patterns have a unique
importance in soil loss values.
Conclusions
Sheet erosion measuring methods used in Hungary have always been in accordance with the
methods used by the rest of the world. The level of the designed experiments and equipment
in Hungary has also increased with international standards. The country spent significant re-
sources to construct and maintain their erosion measuring facilities that resulted in valuable
databases at several locations. The most notable weakness of these efforts has been the poor
publicity of these results due to the majority of the cases data stored in paper-based raw for-
mat without having gone through analysis.
Presently almost all the monitoring activities have been halted mainly due to financial
problems. The existing raw data are unavailable for the scientific community, however with
minimal additional investment they would become important resources for model calibrations
and other soil science purpose. This course of action would be much more inexpensive than
beginning new monitoring activities.
Conversely, some may say that it would be sufficient to use the erosion data measured
by neighboring countries and there is no need to spend additional money for such costly busi-
ness. Moreover, the existing correlations are losing their relevance due to the increasingly
acute influences of climate change. However, Hungary has very diverse patterns of soil types,
land use, climatic conditions and parent rock material that makes the expansion of the results
difficult. Additionally the question of up- and downscaling among scales proves problematic
without measured data.
Regardless, soil erosion is a rather serious problem—also in Hungary—that requires
action. According to the opinion of the authors the increasing quantity of available data on
soil erosion provides a higher level of security for the country.
A review on sheet erosion measurements in Hungary 99
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A review on sheet erosion measurements in Hungary 103
LEPELERÓZIÓS VIZSGÁLATOK EREDMÉNYEI MAGYARORSZÁGON
JAKAB Gergely1, SZABÓ Judit2, SZALAI Zoltán1,2
1MTA CSFK Földrajztudományi Intézet
1112 Budapest Budaörsi út 45. e-mail: jakab.gergely@csfk.mta.hu
2ELTE TTK Környezet- és Tájföldrajzi Tanszék
1117 Budapest, Pázmány Péter sétány 1/C.
Kulcsszavak: talajveszteség, léptékfüggés, módszertani különbség, országos adatbázis
Absztrakt: A talajpusztulás Magyarországon mind ökológiai, mind környezetvédelmi és gazdasági értelemben
meghatározó szerepet játszik ezért mérése és modellezése elsődleges fontosságú, különösen országos léptékben.
Az erózió néhány alapfolyamata jól közelíthető pusztán fizikai összefüggések használatával, azonban a holiszti-
kus megjelenítés - a folyamat meglehetősen összetett volta miatt - csak empirikusan történhet, ami nagymennyi-
ségű mért adat nélkül elképzelhetetlen. A lepelerózió in situ vizsgálatának legalkalmasabb és ezért a leginkább
elterjedt módszere a parcellás mérés, következésképp hazánkban is e mérésekből származik a legtöbb adat. Ma-
gyarország északi és nyugati területei a leginkább veszélyeztetettek a lepelerózió által, ezért a mérések is e terü-
letekre koncentráltak. A legtöbb parcellás mérés a USLE Universal Soil Loss Equation "K" tényezőjének megha-
tározását célozta ezért növényborítás nélküli, folyamatosan magágy állapotban tartott talajt vizsgált. A későbbi-
ekben aztán egyes szántóföldi növények illetve eltérő területhasználati típusok (erdő, kaszáló) talajvédő hatását
is számszerűsítették a mérések során. Ezeken túlmenően eltérő környezeti feltételek és változó lépék mellett a
területet leíró vizsgálatok, mesterséges esőztetések és a talajmozgás detektálása egészítette ki a lepeleróziós
vizsgálatokat. A nagymennyiségű mért adatnak csak egy részét publikálták ezért jelentős részük nem elérhető a
szakemberek számára. A hiányos adatok jelentős csökkenést okoznak a hazai erózióbecslés talajvédelem és
modellezés pontosságában és hatékonyságában. Az egyes területi léptékben mért adatok kiterjeszthetősége más
léptékekre korlátozott ezért a különböző léptékekben mért adatok megléte és használata nélkülözhetetlen. Az
eróziómérésre fordítható források szűkülésével, újabb mért adatok hiányában a meglévő értékek közzététele
létszükséglet.
... Soil erosion may be related to unfavorable lithology (Kašanin-Grubin et al., 2019), soil characteristics (Rădoane and Rădoane, 2017), vegetation cover (Avni, 2005), or geomorphic conditions (Faulkner, 2008;Ballesteros-Cánovas et al., 2017). Many studies of surface runoff erosion have focused primarily on sheet erosion (Montgomery, 2007;Jakab et al., 2015;Aiello et al., 2015) using land-use changes and meta-analysis approaches (Borrelli et al., 2017;García-Ruiz et al., 2015). One of these includes the analysis of roots being exposed by sudden or progressive soil loss to new environmental conditions, causing a reaction in root growth (Gärtner et al., 2001). ...
Article
Approximately 42 % of Mexico is affected by soil denudation resulting from moderate to severe sheet erosion and gullying processes. At Huasca de Ocampo (central Mexico), soil degradation has been linked to intense land use dating back to pre-Hispanic times as well as to unfavorable geological, geomorphic, and climatic conditions. Here, we quantify erosion rates with high precision at annual to multi-decadal timescales by combining, for the first time, dendrogeomorphic reconstructions and UAV-based remote sensing. To assess rates of sheet erosion and gullying processes over the longer-term erosion rates (10-60 yrs), we assessed the age and first exposure of 159 roots to determine sheet erosion rates and gullying processes. At shorter timescales (<3 yrs), we employed an Unmanned Aerial Vehicle (UAV) to develop digital surface models (DSMs) for February 2020 and September 2022. Exposed roots provided evidence of sheet erosion ranging between 2.8 and 43.6 mm yr-1 and channel widening ranging between 11 and 270 mm yr-1, with highest erosion rates found along gully slopes. The UAV-based approach pointed to intense gully headcut retreat with rates between 164.8 and 870.4 mm yr-1; within gullies, channel widening rates ranged between 88.7 and 213.6 mm yr-1 and gully incision rates were between 11.8 and 109.8 mm yr-1. The two approaches yielded very comparable results regarding gully erosion and channel widening; this underlines the potential of using exposed roots to quantifying soil degradation processes retrospectively and considerably beyond the period covered by UAV imagery.
... Soil erosion may be related to unfavorable lithology (Kašanin-Grubin et al., 2019), soil characteristics (Rădoane and Rădoane, 2017), vegetation cover (Avni, 2005), or geomorphic conditions (Faulkner, 2008;Ballesteros-Cánovas et al., 2017). Many studies of surface runoff erosion have focused primarily on sheet erosion (Montgomery, 2007;Jakab et al., 2015;Aiello et al., 2015) using land-use changes and meta-analysis approaches (Borrelli et al., 2017;García-Ruiz et al., 2015). One of these includes the analysis of roots being exposed by sudden or progressive soil loss to new environmental conditions, causing a reaction in root growth (Gärtner et al., 2001). ...
... In the last decade, the agricultural area in Hungary has declined; however, the country is among the leaders in terms of the proportion of agricultural land to the total area in the European Union (BOZSIK & KONCZ, 2018). Two third of the country is used for agriculture (JAKAB et al., 2015). ...
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Land use change may modify key soil attributes, influencing the capacity of soil to maintain ecological functions. Understanding the effects of land use types (LUTs) on soil properties is, therefore, crucial for the sustainable utilization of soil resources. This study aims to investigate the impact of LUT on primary soil properties. Composite soil samples from eight sampling points per LUT (forest, grassland, and arable land) were taken from the top 25 cm of the soil in October 2019. The following soil physicochemical parameters were investigated according to standard protocols: soil organic matter (SOM), pH, soil moisture, NH4 +-N, NO3-N, AL-K2O, AL-P2O5, CaCO3, E4/E6, cation exchange capacity (CEC), base saturation (BS), and exchangeable bases (Ca 2+ , Mg 2+ , K + , and Na +). Furthermore, soil microbial respiration (SMR) was determined based on basal respiration method. The results indicated that most of the investigated soil properties showed significant difference across LUTs, among which NO3-N, total N, and K2O were profoundly affected by LUT (p ≤ 0.001). On the other hand, CEC, soil moisture, and Na + did not greatly change among the LUTs (p ≥ 0.05). Arable soils showed the lowest SOM content and available nitrogen but the highest content of P2O5 and CaCO3. SMR was considerably higher in grassland compared to arable land and forest, respectively. The study found a positive correlation between soil moisture (r = 0.67; p < 0.01), Mg 2+ (r = 0.61; p < 0.01), and K2O (r = 0.58; p < 0.05) with SMR. Overall, the study highlighted that agricultural practices in the study area induced SOM and available nitrogen reduction. Grassland soils were more favorable for microbial activity.
... In the last decade, the agricultural area in Hungary has declined; however, the country is among the leaders in terms of the proportion of agricultural land to the total area in the European Union (BOZSIK & KONCZ, 2018). Two third of the country is used for agriculture (JAKAB et al., 2015). ...
Article
Full-text available
Land use change may modify key soil attributes, influencing the capacity of soil to maintain ecological functions. Understanding the effects of land use types (LUTs) on soil properties is, therefore, crucial for the sustainable utilization of soil resources. This study aims to investigate the impact of LUT on primary soil properties. Composite soil samples from eight sampling points per LUT (forest, grassland, and arable land) were taken from the top 25 cm of the soil in October 2019. The following soil physicochemical parameters were investigated according to standard protocols: soil organic matter (SOM), pH, soil moisture, NH 4 ⁺ –N, NO 3 – –N, AL-K 2 O, AL-P 2 O 5 , CaCO 3 , E 4 /E 6 , cation exchange capacity (CEC), base saturation (BS), and exchangeable bases (Ca ²⁺ , Mg ²⁺ , K ⁺ , and Na ⁺ ). Furthermore, soil microbial respiration (SMR) was determined based on basal respiration method. The results indicated that most of the investigated soil properties showed significant difference across LUTs, among which NO 3 – –N, total N, and K 2 O were profoundly affected by LUT (p ≤ 0.001). On the other hand, CEC, soil moisture, and Na ⁺ did not greatly change among the LUTs (p ≥ 0.05). Arable soils showed the lowest SOM content and available nitrogen but the highest content of P 2 O 5 and CaCO 3 . SMR was considerably higher in grassland compared to arable land and forest, respectively. The study found a positive correlation between soil moisture (r = 0.67; p < 0.01), Mg ²⁺ (r = 0.61; p < 0.01), and K 2 O (r = 0.58; p < 0.05) with SMR. Overall, the study highlighted that agricultural practices in the study area induced SOM and available nitrogen reduction. Grassland soils were more favorable for microbial activity.
... Soil erosion results from natural factors but anthropogenic activities including unsustainable land use practices are thought to accelerate soil erosion [2,[5][6][7][8]. Soil erosion by water can manifest itself in manifolds, i.e., sheet, rill, and gully erosion [9]. Gully erosion is the most detrimental of all forms of erosion because it can quickly remove and transport enormous quantities of soil [10]. ...
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Gullies reduce both the quality and quantity of productive land, posing a serious threat to sustainable agriculture, hence, food security. Machine Learning (ML) algorithms are essential tools in the identification of gullies and can assist in strategic decision-making relevant to soil conservation. Nevertheless, accurate identification of gullies is a function of the selected ML algorithms, the image and number of classes used, i.e., binary (two classes) and multiclass. We applied Linear Discriminant Analysis (LDA), Support Vector Machine (SVM), and Random Forest (RF) on a Systeme Pour l'Observation de la Terre (SPOT-7) image to extract gullies and investigated whether the multiclass (m) approach can offer better classification accuracy than the binary (b) approach. Using repeated k-fold cross-validation, we generated 36 models. Our findings revealed that, of these models, both RFb (98.70%) and SVMm (98.01%) outperformed the LDA in terms of overall accuracy (OA). However, the LDAb (99.51%) recorded the highest producer's accuracy (PA) but had low corresponding user's accuracy (UA) with 18.5%. The binary approach was generally better than the multiclass approach; however, on class level, the multiclass approach outperformed the binary approach in gully identification. Despite low spectral resolution, the pan-sharpened SPOT-7 product successfully identified gullies. The proposed methodology is relatively simple, but practically sound, and can be used to monitor gullies within and beyond the study region.
... Rainfall maximums (the longest statistically evaluable term is 6 days in Hungary according to Goda, L. 1966) refer to pluvial flood formation in the plains caused by the low infiltration capacity and the intense rains where the runoff is limited because of the flat surface. In Hungary, precipitation maximums are in June (1-6 days maximums) and August when mainly extreme 1-day rainfalls occur, hence these months are presumed to have the most important role in soil erosion and partly in pluvial flood formation (Szűcs, P. et al. 2006;Jakab, G. et al. 2015). ...
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Extreme precipitation events can trigger flash flood, mass movements, pluvial flood and accelerated soil erosion. As soil structures are highly degraded due to intensive improper cultivation water infiltration can considerably decrease during the vegetation period. Additional changes in canopy coverage on the soil surface cause relevant variability in infiltration and hence vulnerability against runoff related disasters. Most researchers agree that the frequency of extreme precipitations increases, however, in the Carpathian Basin the uncertainties are quite high. This study aims to compare daily maximum mean precipitation amounts (MMPA) predicted by the Goda-method for June and August as the most probable months of extremities. We used the CarpatClim database as input and predicted MMPAs for two periods, 1960–1985 and 1986–2010. The Goda-method uses monthly data and calculates daily results on given probability. A general increase was found between the first and second half of the period regarding daily maximum precipitation amount in both investigated months. For August the 1-day precipitation amount increased from 56.1 mm to 61.8 mm, whereas 6-days amount from 93.8 mm to 103.2 mm at 1 per cent probability (r = 0.53; p < 0.001). Beyond this change, relevant spatial differences were found. Comparing the macro regions plains had lower increase compared to the mountains, whereas the highest increase was at the. The most endangered location is the southern part of the Transdanubian Hills where parallel with the intensive increase in MMPA both in June and August the environmental conditions such as loose parent material and the high percentage of crop fields also emphasize the potential hazard.
... A talajtípus megváltozására a feltalaj lepusztulása következtében számos, korábbi eróziós kutatás szolgáltat példát (KERÉNYI, 1991;1994;JAKAB, et al., 2015), amelynek következtében jól fejlett, vastag humuszos rétegű talajokból (Luvisol, Phaeozem stb.) antropogén hatások következtében földes kopárok (Regosol) jöhetnek létre. Ugyancsak eróziós, de síkvidéki folyamatok eredményeként a talaj referencia csoport nem, csak a szelvényhez rendelhető minősítők ('nudinatric') változnak meg a réti szolonyec talajok padkás eróziója következtében (NOVÁK & TÓTH, 2016). ...
Article
A WRB diagnosztikai elemeit és a felszínborítási adatokat kombinálva a talajokat ért antropogén hatás mértéke szerint négy csoportot alkottunk: 1. nincs talaj, 2. antropogén eredetű talaj, 3. természetes talaj, de lényeges antropogén bélyegekkel, illetve 4. természetes talaj. A négy csoport valamelyikéhez egyértelműen hozzárendelhető a felszínborítási osztályok mindegyike. Az általunk kidolgozott módszer segítségével értékeltük Magyarország talajtakarójának természetességét. Az ország területének 2%-án nem számolhatunk a FAO által definiált értelemben talaj létével, 6%-án antropogén talajok várhatók (Anthrosol, vagy Technosol), 66%-án a természetes talajok antropogén átalakítottsága eléri a WRB diagnosztikai határértékeit, és mindössze 26% azon talajok aránya, amelyekben antropogén hatások a diagnosztikában nem jelennek meg, azaz természetes vagy természetközeli állapotúként értékelhetők. Talajtípusok tekintetében legnagyobb mértékű emberi hatással a csernozjomok, réti és öntés talajok esetében számolhatunk, míg természetközeli állapotú talajok legnagyobb kiterjedésben a kőzethatású és váztalajokon maradtak fenn. A területi különbségek is jelentősek: míg legnagyobb arányban a Hajdúságon és a Körös-Maros közén találunk antropogén hatásokkal érintett talajokat, addig a természetközeli állapotú talajok aránya az Északi-középhegység egyes hegyvidéki területein a legnagyobb. Módszerünk csak becslésre alkalmas, mégis jó áttekintést ad a hazai talajok antropogén átalakítottságának mértékéről, az emberi tevékenység, mint hatodik talajképző tényező jelentőségéről, intenzitásának térbeli eloszlásáról, amely a hazai talajtani adottságoknak egy eddig kevéssé vizsgált aspektusa.
... A talajtípus megváltozására a feltalaj lepusztulása következtében számos, korábbi eróziós kutatás szolgáltat példát (KERÉNYI, 1991;1994;JAKAB, et al., 2015), amelynek következtében jól fejlett, vastag humuszos rétegű talajokból (Luvisol, Phaeozem stb.) antropogén hatások következtében földes kopárok (Regosol) jöhetnek létre. Ugyancsak eróziós, de síkvidéki folyamatok eredményeként a talaj referencia csoport nem, csak a szelvényhez rendelhető minősítők ('nudinatric') változnak meg a réti szolonyec talajok padkás eróziója következtében (NOVÁK & TÓTH, 2016). ...
Article
Estimation of the extent of anthropogenic transformation of Hungarian soils based on land cover and WRB diagnostics A combination of land cover data and WRB diagnostic traits was used to form four soil groups based on the extent of anthropogenic influence: 1. areas with no soil, 2. areas with anthropogenic soils, 3. natural soils with evidence of human transformation, 4. soils in a natural condition. All the land cover classes could be unequivocally assigned to one of these groups. This method was then applied to evaluate the naturalness of the soil cover in Hungary. No soils meeting the definition of soil according to FAO guidelines were found on 2% of the land surface, anthropogenic soils (Anthrosol or Technosol) were characteristic of 6%, natural soils on which the level of anthropogenic activity reached the WRB diagnostic limit values made up 66% of the land surface, and only 26% of the soils were in a natural or near-natural condition. In terms of diagnostic soil types, the chernozem, meadow and alluvial soils exhibited the greatest extent of anthropogenic influence, while most of the soils in a natural condition were skeletal and lithomorphic soils. There were also considerable territorial differences: the highest rate of anthropogenic transformation was found in the Hajdúság and Körös- Maros Köze regions, while the highest proportion of natural soils was recorded on hilly areas in the Northern Mountains. The method developed for evaluating the naturalness of the soil can only be used as a rough estimate, but it nevertheless gives a good idea of the extent to which Hungarian soils have been exposed to anthropogenic effects, and of the importance of human activity, which is considered to be the sixth soil-forming factor, but which has been less well studied than the other five factors.
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A tájkutatással egyidős az a törekvés, hogy a különböző tájak antropogén átalakítottságát vagy éppen természetességét objektív módszer segítségével fejezzük ki. Az antropogén hatások kifejezésére leggyakrabban a növényzet, vagy a tájak ökológiai állapota szolgál indikátorként. Tanulmányunkban a felszínborítási adatoknak a talajjellemzőkre gyakorolt hatásával és azok megváltozásával jellemeztük az egyes hazai kis- és középtájak antropogén átalakítottságának mértékét. Az eredmények alapján a városodási és iparosodási folyamatok következtében lezajló közismert, és széles körben tanulmányozott talaj- és tájdegradációs folyamatok mellett a táj- és talajhasználat extenzifikációja által érintett jóval nagyobb kiterjedésű területekre illetve azok térbeli koncentrációjára tudtunk rámutatni.
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Adaptation is the most important strategy to reduce the effect of climate change and soil erosion. During this process adequate, rational land use is necessary to ensure climate resilience. Therefore, the main objective in this study was to evaluate the susceptibility of different land use intensities (arable land and grassland) to soil erosion. The rainfall simulation method is a good tool to measure and estimate soil erosion in situ. The comparative measurements were carried out in the field with a Shower Power-02 simulator on 6 m2 plots in Gerézdpuszta, where the slope angles were ~8% and the simulated rainfall events had high intensities (~70–96 mg h−1). The runoff and soil loss were significantly higher from arable land. The runoff-infiltration ratio and runoff coefficient showed lower infiltration capacity in the case of arable land. On average, the suspended sediment loads were tenfold higher under intensive land use. In the case of grassland a moderate increase in infiltration was observed due to higher rainfall intensity, as also reported in the literature. The rainfall simulation method provides good data for soil loss estimations.
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Soil porosity increase on arable fields is mainly the result of cultivation while sealing and crusting are natural processes. The first is a rapid change the latter is slower, however, little is known about the time scale of soil sealing and crusting. Crusting rainfall simulation experiments were carried out to investigate the role of single rainfall events on soil sealing and crusting, on an intensively cultivated arable field. To follow porosity changes trough out the year, undisturbed samples were analyzed. High seasonal differences were identified in bulk density and porosity during the vegetation period that appeared to be the results of tillage. The results of rainfall simulation underline the rapid influence of a single storm in sealing and crusting of a Cambisol by decreasing the final infiltration rate and increasing runoff and sediment load. Porosity reduction manifested first of all in surface crust formation, however, kaolinite was the dominating cay mineral in the investigated Cambisol. Bulk density of the tilled soil layer enhanced by 15% in case of structural and 40% in erosion crust. The higher value could be the result of the continuous deposition according to Stoke's law creating a clay film cover on the surface. The sealing and crusting effect of a single storm could be of the same order as the influence of tillage on soil porosity runoff and soil loss. The porosity created by tillage can collapse during one precipitation event.
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Sedimentological investigations and thermal analyses were carried out in a steep slope vineyard in 2007 (Nagy-Eged hill - located in the north-eastern part of Hungary). This area is proned extremely eroded due to its significant steepness and vine-growing cultivation. Soil thickness is approximately 50 cm near the top while at the bottom the thickness of horizon A alone reaches up to 150 cm. According to the results the ratio of fractions smaller than 0.02 mm and those larger than 2 mm between the top and the bottom is reverse. In the lower slope section the ratio of particles smaller than 0.02 mm is three times that in the upper slope section. Similarly the ratio of particles larger than 2 mm in the lower slope section is five times that in the upper slope section. The quantity of clay minerals measured by thermal analysis is larger than that measured by elutriation indicating that a part of them exceeds the diameter of 2μm. Our results revealed the effects of soil erosion on the mineral composition of the soil. The amount of clay minerals (e.g. montmorillonite) is about the double in the lower section, than in the upper of the slope. Clay minerals caused negative water budget in the upper levels resulting in the occurrence of anthropogenic water deficit as the consequence of soil erosion. Therefore vegetative growth of plants in the lower areas is better than that of those in the upper areas.
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This chapter contains sections titled: Introduction, Historical Evidence of Erosion, Current Erosion Processes, Erosion on Farmland, Soil Conservation, References.
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The factors affecting soil erosion processes are complex and various, comprises two phases: detachment and transport by water. Previous studies indicated that initial moisture content, slope and soil crusts are playing an important role in soil erosion. The primary objectives of this study were to examine the sediment concentration and aggregate size distribution of the washed sediment. Aims were also to create diff erent season specifi cally modelled situations in order to check runoff rates on bare soils under heavy rainfall. The experiments were conducted with a laboratory-scale rainfall simulator using a 1/2 HH 40 WSQ fulljet nozzle on eutric calcaric Cambisol loamic. Altogether, 72 soil loss samples were collected (6 separate precipitations, 3 time periods, 4 particle size fractions). The experiments indicated that the runoff rate was not increased by the presence of soil crusts, and even less sediment occurs on crusted surfaces. This sediment contained smaller fractions compared to recently tilled surface. The sediment concentration increased with the slope angle, but the runoff rates probably depend rather on the micro-morphology and initial moisture content of the surface. The main erosion process is the raindrop erosion after inland inundation and drought in gentle slopes, while the intermediate period of the precipitation is the most erosive. In general, the ratio of the macro aggregates in soil losses decrease and the ratio of the smaller fractions increase with the time during a precipitation event. Changing climate conditions are shown to have an effect on agricultural production through the temporal and spatial distribution of the erosion rates.
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On soils with Natric or Vertic properties in the subsoil and easily erodible (e.g. Mollic) topsoil waters running downslope generate diverse erosional microtopography. This process is particularly well observed on the alkali (Solonetz and Solonchak) flats of the Great Hungarian Plain. To the effect of erosion beginning along the cracks of the alkali ground a szikpadka (salt berm) of some tens of centimetres height and various gradients forms between the berm top with intact soil profile and the so-called vakszik (“blind pan”) with eroded topsoil. The extension of salt-affected soils and the accompanying berm erosion was substantially increased by groundwater table changes in the wake of the 19th-century river regulation and land drainage works. At the same time, previous research has proved that this type of erosion of extremely slow rate was an active geomorphic agent on alkali soils in the Pleistocene and in the warm semiarid stages of the Holocene.
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Flooding and waterlogging events showed a frequency rising sharply during the last decades so their prevention has become a very actual task. Prevention should start where surface runoff is generated, i.e. over the areas used for agriculture and forestry of hilly and mountainous watersheds. Conservation agriculture is a very successful method for keeping rainwater in the soil and for decreasing the sediment and nutrient load of surface waters. The increased amount of soil moisture is favorable both for the plants and for soil fauna. The mitigation of runoff , soil and nutrient loss is due to the organic matt er which remains in the topsoil as it is not disturbed and moved downwards in the soil by ploughing as well as to the activities of soil edaphon. By applying non-inversion, shal-low tillage runoff can be reduced to a mere one third and soil loss to the thirtieth-fortieth of the values measured under conventional tillage, depending on weather conditions of the given year. Experiments show that conservation agriculture provides for profi table production and at the same time it is benefi cial for the environment.
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On arable lands intensive soil management can lead to severe land degradation: soil erosion and reduced biodiversity are among its manifestations. The main objective of the National Rural Development Plan is to shape such an agricultural practice, which is based on the sustainable use of natural resources and the protection of biodiversity and landscape values. Conservation tillage is this sort of sustainable farming practice. Its main advantages are the protection against erosion and deflation, preservation of soil structure, retention of soil moisture, enrichment in organic matter, protection of soil life and contribution to biodiversity. Our aim was to compare the effects of conventional and conservation tillage on soil erosion, on a study site located on the Western subcatchment of Lake Balaton (Szentgyörgyvár), where runoff, soil loss and nutrient loss were measured at every rainfall event on four plots. For the statistical analysis of the measured data SAS and Statistica programmes were used, applying general and generalised linear mixed models, respectively. The study gives an overview of the SOWAP (Soil and Water Protection) project carried out between 2004 and 2006. The results gained during three years of experiments show that frequency of runoff was much lower in case of conservation tillage (30.8%) than in case of conventional tillage (74%). On the whole, conservation tillage proved to be more favourable at all points: in winter wheat, sunflower and maize crops runoff was reduced by 66.8%, soil loss by 97.3%, TOC loss by 91.1%, nitrogen loss by 86.8%, phosphorus loss by 95.6% and potassium loss by 78,8% comparing to the values measured on the conventional plots. Tolerable soil loss determined on the basis of the rate of soil formation is 2 t/ha/year. In case of conventional tillage, average annual soil loss was 4.26 t/ha, thus erosion exceeded the rate of soil formation. On the plots of conservation tillage the average annual soil loss was 0.11 t/ha, therefore sustainable farming can be assured with this practice. Consequently, there is a possibility of protecting soil resources, reducing soil erosion and nutrient loss within an intensive agricultural system by using conservation tillage (shallow, contour tillage with crop residues partly left on soil surface and partly rotated into the soil) instead of conventional tillage.
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Rainfall simulator experiments were set up in Balatonszabadi on chernozem soil. The soil erodibility factor (K factor) was calculated based on the soil loss data from rainfall simulation and the Universal Soil Loss Equation (USLE). The C factor of the USLE model describes the effects of land cover such as cities, rivers, lakes, forests, pastures/meadows, orchards, arable lands and others. On arable lands the estimated soil loss is highly dependent on C factors. The present goal is to highlight the effects of local soil erodibility experiments on the number of crops that can be chosen for sustainable land use. Local measurements proved some estimated Hungarian erodibility data from the literature to be too high, resulting in higher predicted soil losses. Higher predicted soil loss increased the necessity for soil protection operations and decreased the number of plant species available for sustainable crop production. Incorporating the USLE equation into a GIS model makes it possible to calculate soil losses for particular areas (watersheds, for instance) or to analyse potential management strategies by adjusting factors in the equation (such as vegetation cover), running the model, and then comparing the output with alternative scenarios.
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Because of population growth the global demand for food is rapidly increasing. As a consequence of this agriculture is expanding and becoming more intensive. Agricultural land use has the highest share among land use categories in the world therefore it is very important that farming activities are sustainable for the landscape and environment friendly. The aim of this paper is to present the positive role of conservation agriculture in landscape protection on the example of the results of the SOWAP (Soil and Surface Water Protection) project, supported by EU LIFE and Syngenta. Within the framework of the project tillage plots were established at two locations in Hungary, near Lake Balaton on Luvisol and Cambisol soils. The experimental program included soil erosion, biodiversity, soil microbiology measurements and agronomic traits. Runoff from the conservation tillage treatments was reduced by 66.8%, soil loss by 98.3%, TOC loss by 94.1%, nitrogen loss by 86.8%, phosphorus loss by 95.6% and potassium loss by 78.8% relative to values measured on the conventional plots. Soil moisture conditions have improved in the upper 20 cm under conservation tillage. Rainfall simulation experiments indicate the protection of plant residues resulting in the reduced number and volume of rills under conservation tillage. Yields of winter wheat, winter oilseed rape, sugar beet and maize were similar from plowed fields and conservation-tilled fields. There was a considerable improvement of biodiversity conditions on the conservation plots. The results of the SOWAP project give a reliable evidence that conservation agriculture is sustainable and it is an adequate tool for landscape protection.
Chapter
IntroductionMagnitude of Soil Erosion in RomaniaSoil ConservationConclusions AcknowledgementsReferences