Raitis Meļņiks

Raitis Meļņiks
Latvijas Valsts mežzinātnes institūts "Silava"

MSc

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29
Publications
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75
Citations

Publications

Publications (29)
Article
Full-text available
Emissions of carbon dioxide (CO2), nitrous oxide (N2O), and methane (CH4), particularly those from organic soils, need to be reduced in the context of climate change mitigation (CCM). Here, we estimated the greenhouse gas (GHG) fluxes from nutrient-poor organic soils in cranberry (Vaccinium macrocarpon) and highbush blueberry (Vaccinium corymbosum)...
Conference Paper
Full-text available
Assessment of changes in carbon (C) stocks in mineral soils typically relies on the steady-state C stock values, which are influenced by various long-term land-use and management scenarios. This conventional approach limits understanding of the short-term soil C balance, including in lands not subject to land-use or management changes. Additionally...
Article
Full-text available
This study evaluated the impact of different land use types on groundwater dissolved organic carbon (DOC) concentrations and annual DOC efflux from drained peatlands to catchment runoff, providing insights into the mechanisms of carbon stock changes in peatland soils. We measured groundwater chemical properties and various environmental variables,...
Presentation
Full-text available
This study investigates the distribution and carbon content of organic soils in Latvia, leveraging machine learning techniques alongside remote sensing and National Forest Inventory (NFI) data to enhance the precision of organic soil mapping. Our approach integrates data from various sources, including airborne laser scanning (ALS) data, digital el...
Article
Full-text available
Organic horizons including peat deposits are important terrestrial carbon pools, and various chemical, biological, and water exchange processes take place within them. Accurate information on the spatial distribution of organic soils and their properties is important for decision-making and land management. In this study, we present a machine learn...
Article
Full-text available
Drained organic soils in agricultural land are considered significant contributors to total greenhouse gas (GHG) emissions, although the temporal and spatial variation of GHG emissions is high. Here, we present results of the study on soil-to-atmosphere fluxes of carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4) from drained organic (fen)...
Article
Full-text available
Peat erosion has a significant impact on soil fertility, agricultural productivity, and climate change dynamics. Through this process, the topsoil rich in organic matter and carbon (C) is removed and can travel long distances, causing a net C loss. Additionally, peat undergoes oxidation, resulting in further C loss. In our study, we evaluated C los...
Article
Open source GIS software GRASS releases 8.0 to 8.4 have received some long overdue improvements in imagery handling such as the ability to reuse spectral signature files of existing classifiers, machine readable output of accuracy assessment tool and a support vector machine (SVM) classifier. Practical comparison of all three pixel‐based classifier...
Article
Full-text available
When it comes to greenhouse gas (GHG) reduction, the role of water tables in former peat extraction areas has received considerable interest in recent decades. This study analysed the carbon dioxide (CO 2), methane (CH 4) and nitrous oxide (N 2 O) surface-to-atmosphere fluxes from a rewetted and permanently flooded former peat extraction areas in c...
Presentation
Full-text available
Pārskats par 2022. gada pētniecisko uzdevumu izpildi pētījumu programmā "Tehnoloģijas meža apsaimniekošanas procesu efektivitātes paaugstināšanai". Līguma Nr. 5_5.9.1_0081_101_21_87
Article
Full-text available
The aim of this study was to evaluate the impact of groundwater level, soil temperature and general soil chemistry on greenhouse gas (GHG)—carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O)—fluxes from tree stems in deciduous stands with nutrient-rich naturally wet and drained peat soils. In total, nine sample plots were established in the...
Article
Full-text available
Extensive use of drainage ditches in European boreal forests and in some parts of North America has resulted in a major change inwetland and soil hydrology and impacted the overall ecosystem functions of these regions. An increasing understanding of the environmentalrisks associated with forest ditches makes mapping these ditches a priority for sus...
Article
Full-text available
Nutrient-rich organic soil management in agriculture is among the critical sources of greenhouse gas (GHG) emissions globally and at the European level, where the most significant effects are observed in Northern, Eastern, and Central Europe. Growing climate change mitigation targets urge the need to assess and analyze current organic soil manageme...
Conference Paper
Full-text available
The aim of the study is to develop a methodology for assessment of the area and properties of buffer zones around drainage ditches and areas surrounding protective belts around natural streams, for transformation into "biomass factories". In Latvia and neighboring countries, these buffer zones have significant biofuel production, as well as climate...
Article
Full-text available
The aim of this study is to develop a method for identification of the drainage ditch network, which can be used for surface runoff modeling and to increase accuracy of estimation of greenhouse gas (GHG) emissions in croplands and grasslands, using remote sensing data. The study area consists of 11 objects throughout Latvia with a total area of 145...
Conference Paper
Full-text available
Aim of this study is to develop a method for automatic shallow drainage ditch generation to drain terrain depressions using four factor least cost surface which is obtained using LiDAR (light detection and ranging) data and Sentinel-2 multispectral satellite imagery. LiDAR data are used for depression mapping in DEM, flow accumulation and slope mod...
Article
Full-text available
Soil berms are typically built on the sides of ditches and are designed to purify water from agricultural fertilizers and to limit the transport of sediments to water bodies. However, for soils with fine particles, water filtration is limited and wet soil conditions can occur, which in turn reduces the soil's hydrologic conductivity capacity and hi...
Conference Paper
Full-text available
The aim of this study is to investigate and adapt existing methods for the identification of ditch connections and culverts using LiDAR (Light detection and ranging) data. The research area is located in Daugavpils region, Kalupe parish and covers area of 25 km2 . Two methods are used, the first one is based on a ditch network analysis previously o...
Technical Report
Full-text available
The ditch shelters are formed at the edges of ditches and are constructed for technological purposes, as well as mechanical barriers, for example, to delimit protected nature areas on wet organic or mineral soils from drained forests. However, in most cases the effects of mechanical barriers are undesirable. In soils with fine texture water filtrat...
Technical Report
Full-text available
Pētījuma mērķis ir pilnveidot aramzemju un ilggadīgo zālāju apsaimniekošanas radīto SEG emisiju un CO₂ piesaistes uzskaites sistēmu un pilnveidot, kā arī izstrādāt jaunus metodiskos risinājumus SEG emisiju un CO₂ piesaistes aprēķiniem. Pētījumā izstrādātos risinājumus paredzēts izmantot nacionālās SEG inventarizācijas pilnveidošanai, novērtējot aug...
Technical Report
Full-text available
Pētījuma mērķis ir novērtēt mežizstrādes tehnikas ietekmi uz augsnes sablīvēšanos grāvju atbērtnēs un raksturot augsnes sablīvējuma ietekmi uz ūdens apmaiņu starp mežaudzi un notekgrāvi. Pētījums veikts Ceraukstes pagastā. Izvēlēti trīs pētījuma objekti, kas reprezentē grāvju atbērtnes pie jaunizbūvētiem meža ceļiem, kur vēl nav veikta kokmateriālu...
Technical Report
Full-text available
The aim of the study is to assess the impact of the compaction of the soil in the technological corridors on the water regime in the forest stand due to extraction of roundwood in commercial felling. The study was carried out in 6 research sites on sandy and moraine clay sediments nearby Jaunjelgava, Ogresgals and Vecbebri municipalities. Each stud...
Technical Report
Full-text available
Aim of this study is to evaluate methodology from previous study steps in scale of single forest stand. Area of this study consists of 12 forest stands on 4 different Quaternary sediment types where clear cut has been done during 2018. Data about depth of ruts, soil penetration resistance and soil moisture was collected in field works. Data were co...
Presentation
Full-text available
Tasks and preliminary results of the research program on forest operations and bioenergy production technologies (in Latvian).
Presentation
Full-text available
Pētījumu par attālo izpēti, biokurināmā ražošanu un kompaktklases tehnikas izmantošanu mežsaimniecībā rezultātu kopsavilkums.

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