A framework for adaptation to climate change effects in salt affected agricultural areas of Indo-Gangetic region

Abstract

Indo-Gangetic plain (IGP) constitutes about 13% of the total geographical area of the India, and it produces about 50% of the total food grains. Salt infestation in soils is rampant which poses threat to productivity of agricultural lands, and change in climate could play vital role in further aggravating the problem. Many agricultural practices can slow development of salts in soil and may even mitigate greenhouse gas emissions which contribute to climate change. Crop, soil and water management can provide immediate adaptation measure for changing climate effects, and can also meet long-term mitigation goals. Agricultural management can have interactions with soil sodicity-salinity development at several junctures affecting either one or all of these: GHG emissions, soil carbon balance, water use and landscape water balance, water and salt fluxes, and water quality. For salt affected soils, most of these interactions are influenced by change in rainfall and temperature, and extreme conditions in either direction can lead to increase in salinity and sodicity in soil. Therefore, the management conditions need to be analysed more carefully with life cycle assessment and feedbacks from other interacting elements like society and policy developers. A conceptual framework for systematically meeting the goal of climate change mitigation and adaptation for salt affected soils of Indo-Gangetic region based on these interactions is proposed.

Full text

A framework for adaptation to climate change effects in
salt affected agricultural areas of Indo-Gangetic region
A.K. BHARDWAJ1*, M.S. NAGARAJA2, S. SRIVASTAVA3, A.K. SINGH4
and SANJAY ARORA5
Received: 10 October 2015; Accepted: 17 February 2016
ABSTRACT
Indo-Gangetic plain (IGP) constitutes about 13% of the total geographical area of the India, and it produces
about 50% of the total food grains. Salt infestation in soils is rampant which poses threat to productivity
of agricultural lands, and change in climate could play vital role in further aggravating the problem.
Many agricultural practices can slow development of salts in soil and may even mitigate greenhouse
gas emissions which contribute to climate change. Crop, soil and water management can provide
immediate adaptation measure for changing climate effects, and can also meet long-term mitigation
goals. Agricultural management can have interactions with soil sodicity-salinity development at several
junctures affecting either one or all of these: GHG emissions, soil carbon balance, water use and landscape
water balance, water and salt fluxes, and water quality. For salt affected soils, most of these interactions
are influenced by change in rainfall and temperature, and extreme conditions in either direction can
lead to increase in salinity and sodicity in soil. Therefore, the management conditions need to be analysed
more carefully with life cycle assessment and feedbacks from other interacting elements like society and
policy developers. A conceptual framework for systematically meeting the goal of climate change
mitigation and adaptation for salt affected soils of Indo-Gangetic region based on these interactions is
proposed.
Key words: Sodicity, Salinity, Agriculture, Adaptation, Mitigation, Climate change
Journal of Soil & Water Conservation 15(1): 22-30, January-March 2016
ISSN: 0022-457X
1Senior Scientist, ICAR-Central Soil Salinity Research Institute, Karnal-132001, Haryana
2College of Horticulture, University of Horticultural Sciences, Bagalkot-587102, Karnataka
3,4,5Regional Research Station, ICAR-Central Soil Salinity Research Institute, Lucknow-226005, Uttar Pradesh
*Corresponding author Email id: ak.bhardwaj@icar.gov.in
INTRODUCTION
Indo-Gangetic region is one of the most
populated areas of world and provides livelihood
security for several hundred millions of people.
Population explosion in the region, and in India as
a whole, has result in escalated demand for food,
and it is estimated that the food grain requirement
by 2020 in the region will be almost 50% more than
at present (Paroda and Kumar, 2000). The Indo-
Gangetic plain (IGP) is environmentally sensitive,
socially significant and economically strategic
region where landscape, hydrology and soil fertility
are threatened by climate warming coupled with
anthropogenic pressure. Climate change has
various direct and indirect effects on agriculture
production, although these effects may be small to
moderate at present. Despite of various efforts
taken to mitigate the adverse effects of climate
change, significant effects are highly likely to occur
over the next century (IPCC, 2007).
According to intergovernmental panel on
climate change (IPCC), the rise in global mean
surface temperature with the same rate as today
would be 1.4–5.8 ºC by 2100 (IPCC, 2001). Countries
with warmer climates like India will be more prone
to the negative effects of climate change on crop
production (Cline, 2007). Reports reveal that all-
India mean annual temperature has shown
significant warming trend of 0.05°C/10 y during the
period 1901 to 2003, however, during 1971 to 2003
it has been accelerated to 0.22°C/10 y (Kothawale
and Ropakumar, 2005). Increased emissions of
carbon dioxide (CO2), methane (CH4) and nitrous
oxide (N2O) are mainly responsible for this
accelerated rate. Modeling for climate scenario
shows that India could feel incidences of warm and
wet conditions, altered precipitation frequency and
intensity resulting due to climate change (Watson
et al., 1996). These changes in climate play an
important and effective role for soil productivity
of the Indo-Gangetic region.
The agricultural area of IGP is shrinking due to
the spread of marginal saline areas in Haryana,
Punjab and Uttar Pradesh. On the other hand, the

CLIMATE CHANGE IMPACTS ON SALT AFFECTED SOILS 23January-March 2016]
productivity of land is also declining due to climate
anomalies. About 0.75 t ha-1 decrease in rice yield
with 2ºC increase in air temperature in high
yielding rice areas and about 0.06 t ha-1 in the low
yield coastal regions has been reported by Sinha
and Swaminathan (1991). An increase of 1ºC
temperature may cause decrease of 8% wheat yield
under salt affected areas of Uttar Pradesh (Mishra
et al., 2011). It may also reduce wheat crop duration
by seven days and reduce yield by 0.45 t ha-1
(Aggarwal et al., 2004). Though the region specific
impacts of climate change are uncertain in India,
the farmers of marginally productive and rain-fed
lands are going to suffer significantly.
There is a need to identify region specific
problems associated with agricultural activity due
to the effects of environmental changes on crop
production. Management options to mitigate
climate change and their effects also need to be
delineated. However, adaptation efforts are now
being taken as paired measures with mitigation
strategies to uphold soil productivity under the
climate change scenario, particularly in developing
countries. It should be of utmost priority to consider
and prepare for impacts of climate change on food
production to ensure food security for the global
population (Schmidhuber and Tubiello, 2007).
Collaborative efforts are required to guarantee the
practices applied are significant assuming it as a
collective responsibility of all sectors at global level.
Here, we analyze various interactions which
management of salt affected agricultural soils could
have with climatic changes, and their implications
for salt affected areas. We put forth a conceptual
framework for meeting the goal of climate change
mitigation and adaptation for salt affected areas of
Indo-Gangetic region based on these interactions.
Interactions of Change in Climate with Agriculture
Agricultural Land Use Impacts Global Warming
The potential of greenhouse gases like CO2,
N2O, CH4 to warm up the environment is referred
to as its global warming potential. It is a relative
measure of how much heat a greenhouse gas traps
in the atmosphere. The overall balance between the
net exchange of gases from a crop production
system constitutes the net global warming potential
(GWP) of that production system. The common unit
is referred to as carbon dioxide equivalent or CO2e.
Increased concentration of greenhouse gases in
atmosphere over last 250 years has been primarily
attributed to the combustion of fossil fuels, and land
use changes, including deforestation, biomass
burning, draining of wetlands, ploughing and use
of fertilizers. It now far exceeds pre-industrial
values determined from ice cores spanning many
thousands of years (IPCC, 2007).
According to IPCC (1996), agricultural facilities
contribute approximately 20% of the annual
increase in anthropogenic GHG emissions. When
accounting for major GHGs from agriculture,
carbon dioxide (CO2), nitrous oxide (N2O) and
methane (CH4) possess top places. Human activities
are responsible for altered carbon cycle. They
influence addition of carbon as well release of
carbon from natural sinks like soil. About 75% of
total CO2 emissions have been accredited to burning
of fossil fuels and rest to land use changes in the
past 20 years (IPCC, 2001). Global concentration of
atmospheric CO2 has increased from 280 ppm
during pre-industrial phase to 379 ppm in 2005 that
exceeded by far the natural range over the last
650,000 years (180 to 300 ppm) as determined from
ice cores (IPCC, 2007).
Agriculture sector is considered as the largest
producer of non CO2 emissions like methane (CH4)
and nitrous oxide (N2O), contributing about 60%
of total emission (WRI, 2012). Globally, 52% of CH4
and 84% of N2O emissions are attributed to the
agricultural sources such as animal husbandry,
manures and agricultural soils (Smith et al., 2008).
Flooded rice cultivation is attributed to be the third
largest source (91%) source of agricultural
emissions, and contributing to 11 percent in the
form of methane arising from anaerobic
decomposition of organic matter. According to
USEPA (2006), the emission of methane in highly
populated regions like China and South East Asia
are expected to increase by 10 and 36%, respectively,
by 2020. However, quantification of methane
emission from paddy fields is difficult as it is
dependent on the land in cultivation, fertilizer use,
water management, density of rice plants and other
agricultural practices (Aydinalp and Cresser, 2008).
Animal husbandry (7%) and the burning of
agricultural wastes (2%) contribute less significantly
to CH4 emissions.
Agriculture accounts for about 38% of global
emission of N2O. Nitrous oxide emissions
contributed to 40–44% of the GWP from rain-fed
sites and contributed 16–33% of GWP in the
irrigated system (Mosier et al., 2005). Application
of nitrogenous fertilizers, cultivation of nitrogen
fixing crops, retention of crop residues and
cultivation of soils with high organic carbon content

24 BHARDWAJ et al. [Journal of Soil & Water Conservation 15(1)
are the main sources. Nitrification and
denitrification resulting in N2O production get
enhanced when available nitrogen exceeds plant
requirements.
Agricultural Management Impacts Soil Carbon Balance
The carbon pool within the soil systems is
considered to be the world’s largest terrestrial store
of carbon (Post et al., 1982), but various
anthropogenic activities like land use change and
land management practices are affecting soil carbon
stocks and carbon fluxes. Estimates suggest that
agriculture production contributes up to 12,000
megatons of carbon dioxide equivalent (CO2e) a
year and up to 86% of all food-related
anthropogenic greenhouse-gas emissions (Gilbert,
2012). The accumulation of organic carbon in soil
is proportional to carbon assimilation in biomass.
It increases with increasing precipitation (Post et
al., 1982) and decreasing temperature (Burke et al.,
1989). Therefore, net ecosystem productivity is
strongly linked with the climatic conditions.
Net ecosystem productivity (NEP) is used to
measure the net exchange of carbon between an
ecosystem and the atmosphere; however it is more
intricate and difficult to assess. The NEP has been
reported to decrease with increase in water stress
in forests (Granier et al., 2007). It can be taken as a
good indicator of carbon accumulation rate within
a system though it is largely dependent on
prevailing management practices and climatic
conditions. For an ecosystem net primary
productivity (NPP) and carbon storage are
potentially affected by the changes in atmospheric
CO2 concentration and climate. A positive
correlation has been established between NPP i.e.
the total plant growth per unit area per year, and
climatic conditions. Under climate change scenario
crop yield may get positively affected because of
CO2 fertilization under high concentration of CO2
or may decrease due to rising air temperatures
(Rosenzweig and Hillel, 1998) and water stress (Fig.
1). Agricultural practices like resource conservation
has been related to significant changes on soil
carbon build up (Mishra et al., 2015).
Agricultural Management Impacts Water-use and
Landscape Water Balance
Projections regarding the change in
precipitation patterns, owing to change in climate,
indicate that the cropping duration and crop
production may be severely affected as over 80%
of total agriculture is rainfed (Olesen and Bindi,
2002; Reilly et al., 2003). The availability and
distribution of soil water responds to climate
change due to altered precipitation patterns or
drought event. Change in hydrological patterns is
expected to increase the uncertainty in water
availability leaving some regions more affected
than others. Climate change is expected to affect
the regional water balances (Eagleson, 1986).
Regional water balances comprise division of
incoming precipitation into runoff,
evapotranspiration, and soil moisture storage. High
rainfall intensity decreases downward movement
of water whereas low rainfall, conjugated with high
temperature, aggravates the problem of soil
salinization because of increased rate of
evapotranspiration and increased capillary
movement of water and salts to the surface of soil.
Evapotranspiration (ET) is primarily a function
of water flux through vegetation canopy and is
controlled by stomatal conductance and canopy
characteristics (Woodward, 1987). Annually,
approximately 42.1% of the total rainfall gets
converted into evaporation, 48.1% into stream flow
and rest lost as seepage (Combalicer et al., 2010).
Increased ET may cause 20% decrease in runoff
relative to precipitation and 58% decrease in soil
moisture storage (Marks et al., 1993). Climate
change has potential effects on evapotranspiration
(ET) due to its effects on air temperature, wind
speed, cloudiness and atmospheric turbidity
affecting the radiations. Increased ET and longer
growing seasons would increase the demand for
irrigation requirements globally up to 5-20% or
more by the 2070s or 2080s (Fisher et al., 2006).
Climatic factors like temperature, rain, wind and
humidity affect the seasonal shift in water balance
Fig. 1. Soil carbon buildup rates in an Indo-Gangetic region
soil under different management practices for wheat
and rice crops. (Error bars denote ± 1SE)

CLIMATE CHANGE IMPACTS ON SALT AFFECTED SOILS 25January-March 2016]
by influence on evaporation and transpiration. An
increase in CO2 concentration may cause reduction
in rate of evapotranspiration due to reduced
stomatal aperture and small openings in the leaves,
leading to increase canopy resistance (Long et al.,
2004).
Climate Change Affects Soil Water and Salt Balance
Increased rate of ET and aridity also brings in
the problem of salinity especially in the areas where
ground water table is shallow. Salts travel along
with the capillary water to the overlying soil
horizons. The availability of water to plants is
influenced by various soil properties viz., porosity,
field capacity, plant available water, soil texture etc.
(Jarvis 2007; Reynolds et al., 2002). Higher salt
content in the soil profile and higher salt
concentration in the soil solution alters the osmotic
potential of water, affecting plant available form.
Along with this, high temperatures elevate drier
conditions which increase water stress and
accentuate demand for water (Fink et al., 2004). Salt-
affected soils with high pH and presence of certain
cations and anions in the soil solution and on
exchange sites can have ion specific effects due to
change in osmotic potential, and imbalance in plant
nutrition (due to deficiency/toxicity of different
nutrient). It all may have direct effect on soil biota
and plant growth and as a whole on the crop yields
(Mengel and Kirkby, 2001).
High temperature and high ET has been found
to cause accumulation of salts in the upper soil
horizon with decreased rate of downward leaching
resulting into soil salinization/alkalization even in
places that were not found affected earlier (Dregne,
1976). Studies done in four different climatic regions
of world i.e., Mediterranean, semi-arid, mildly arid
and arid, reveal a non-linear relationship between
soluble salt concentration and rainfall (Pariente,
2001). Salt affected soils result from changes in
water balance along with excess salt accumulation
at some depth in the soil profile following erosion
leaving it exposed to atmosphere (West et al., 1994).
Plants growing on these soils are susceptible to
osmotic stress and specific ion toxicity that overall
decreases the quantity (yield) and quality of the
crops (Grattan and Grieve, 1999). Salt accumulation
negatively affects the soil properties and processes
and reduce land potential to be cultivated or for
any other use (Kovda and Szabolcs, 1979; Szabolcs,
1990; Varallyay, 1994). High salt content in the soil
water along with impaired ratios of elements like
Ca and Na make it unavailable to plants. Soil water
phase of salt affected soils shows signs of low
nutrient ion activities (Curtin and Naidu, 1998;
Grattan and Grieve, 1999).
Climate Change Effects on Salt Affected Soils
Salt affected soils are rich in salts in soil solution
as well as exchange complex. They can have several
ways of interaction with climate change effects (Fig.
2). Climate change is causing increase in soil
salinization/sodicity problem. Dregne et al. (1991),
reported that in 11 countries, about 29.6 Mha area,
out of total 158.7 Mha irrigated area, is affected with
high salt content. Increasing salinization of natural
resources like soil, land and water is now regarded
as serious environmental problem. Changes in
hydrology tend to raise the water table and increase
the mobilization of salts (Slinger and Tenison, 2005;
Charman and Wooldridge, 2007). Further,
accumulation of salts creates other problems and
inhibits the growth, thus affecting productivity.
Also, salt affected soils have poor structure which
is a major constraint while using these soils for
production.
Marginal Productivity Relates to Higher Susceptibility
Climate plays an important role in maintaining
the soil properties. It can have adverse effects on
all type of soils yet can have even more deleterious
effects on sodic lands. Increased sodicity affects the
soil physical properties like dispersion and slaking,
and cause dispersion of aggregates and loss of
carbon bound within aggregates and physically
protected from decomposition (Tisdall and Oades,
1982). Smith et al., 2009, estimated that agricultural
soil would lose upto 62-164 Tg carbon by 2100 with
the changed climate scenario using Century Model.
Fig. 2. Illustration of salt development mechanisms in soil
and control of climate driven factors for salinity
development

26 BHARDWAJ et al. [Journal of Soil & Water Conservation 15(1)
Sodic soils with high amount of sodium on
exchangeable sites affects the plant growth (Gupta
and Abrol, 1990), and climate change may
aggravate the problem. Altered pattern of rainfall
can affect the capacity of soil to maintain the
required level of organic carbon and also the soil
structure. Sodic soils suffer from ponding on
surface due to their lower infiltration rates. High
evapotranspiration causes rise in salt concentration
in soil solution. The soil moisture available to plant
is in very low amount and presence of salts in this
water raises the osmotic potential of soil solution.
Water becomes physiologically unavailable to
plants and may generate water stress and other
nutrients deficiencies. Nitrogen is an important
element for crop growth especially in sodic soils
(Curtin and Naidu, 1998), but the rate of loss of N
through volatilization increases in soils with high
pH and waterlogged conditions (Gupta and Abrol,
1990; Grattan and Grieve, 1999). Also presence of
high level of chloride may also limit the uptake of
nitrate (Grattan and Grieve, 1999). All these factors
may altogether affect the plant growth,
reproduction and senescence by affecting plant’s
physiological and biochemical functions (Lauchli
and Epstein, 1990; Rengasamy et al., 2003).
Low Soil Stability Relates to Higher Impacts
Soil structure is a very important factor in crop
production, controlling cultivation, plant growth,
grain yield and quality (Shepherd, 1992). Increasing
sodicity may affect the rate of biomass
accumulation and carbon emission and thus can
alter the carbon dynamics in the soil. Dispersion of
soil aggregates causes loss of soil carbon and
generates other conditions like compaction.
Formation of soil crust can affect various soil
processes like water infiltration, run off, erosion and
evaporation. Dispersive clays and soils are much
more susceptible to dispersion (Bhardwaj et al.,
2010). Presence of Na in any clay mineralogical
group increases the dispersivity of soil (Bhardwaj
et al., 2009). High clay content in the soils helps
develop cracks when soil is dry. Drier climatic
conditions will enhance the problem by increasing
the frequency and size of cracks (Climate Change
Impacts Review Group, 1991). Owing to rigorous
structural degradation, presence of high salt content
and consequently developed imbalance in water
availability limits the biomass production on sodic
soils. Climate change will aggravate the
degradation of sodic soils by accelerating salt
accumulation in susceptible regions.
Framework for Adaptation to Climate Change
With growing demand for food supply, there
is a need to increase the area of arable land. Land
resources being limited, reclaiming salt affected
lands for agriculture is a highly lucrative
alternative. Further, bringing salt affected soils to
cultivation require the development and
implementation of farming practices which are
efficient, inexpensive, and with minimal effects on
environment (Qadir and Oster, 2002). The amount
of carbon stored in salt affected soils is usually very
less than in normal soils (Paustian et al., 1998), due
to low primary productivity. Sodic soils can be
reclaimed using amendments like gypsum, a source
of calcium in available form to replace the excess
of Na on exchangeable sites that may be leached
out then with excess water. These soils can be
cropped appropriately, upon reclamation, to
enhance productivity, and sequestration of carbon
which is considered as an important mitigation
strategy against the elevating concentration of CO2
in the atmosphere. Locking of atmospheric CO2 into
the soil systems also enhance the soil and water
quality, and improve the productivity of land. Land
management practices that are favorable to plant
growth, soil biota and soil structure are believed to
enhance the soil organic matter and will increase
the soil carbon density. Management practices such
as zero tillage, conservation tillage, change in
cropping pattern, use of tolerant varieties, and
reduced summer fallowing, all complement
sequestration of carbon with in the soil system.
Reduce/conservation tillage rationalizes the
undesirable effects of plowing by causing
mechanical disturbances to the soil aggregates (Parr
et al., 1990). Traditional management practices
involve mineralization of soil organic carbon by
enhancing the breakdown of soil aggregates. On
the other hand conservation agricultural practices
decreases this loss by slowing down the breaking
of aggregates (West and Post, 2002). The scope of
carbon assimilation and sequestration in soil is
higher in marginally productive saline and sodic
soils which are very low in soil carbon.
Soil carbon sequestration although involves the
interaction with other important nutrients/
minerals, several experiments have been conducted
by workers to evaluate the improvement in carbon
content of salt affected soils cultivated using
suitable management practice (Mishra et al., 2015;
Gupta and Abrol, 1990; Singh, 1989; Garg, 1998;
Singh et al., 1994, 1997). Several packages of
practices have been developed and evaluated.

CLIMATE CHANGE IMPACTS ON SALT AFFECTED SOILS 27January-March 2016]
Mishra et al. (2010) also reported increased in
carbon content in sodic soils under different
horticulture crops. Use of crops tolerant to high salt
levels and those needing minimum tillage will also
be beneficial for cultivation on salt affected lands.
Climate change will have more adverse effects
on saline and sodic soils than normal soils. At the
same time new areas, due to altered rainfall pattern
and high temperature, are getting affected by salt
accumulation and becoming susceptible to salinity
development. Climate change favours development
of conditions which enhance salt accumulation in
soil profile, their movement to upper horizons and
development of osmotic stresses. Agricultural
practices like land use change, improper use of
fertilizers and cropping patterns with higher
emissions of greenhouse gases have also been
contributing to climate change phenomena. High
temperatures accelerate evapo-transpiration
causing upward movement of salt to upper
horizons. Salt accumulation in soil solution makes
water unavailable to plants, causing decrease in
crop yield. This condition is more severe in case of
saline and sodic soils that are already affected with
high level of salts and have marginal productivity.
Most of recently developed sodic soils are in
highly productive regions of world such as Indo-
Gangetic plain. Reclamation of these lands and then
by putting them under proper management brings
great opportunity to increase food supply and
livelihood security, especially in developing
countries. On the other hand reclamation and
management of salt affected areas can increase
primary productivity and helps in sequestering
carbon in soil to meet the climate change mitigation
goals. These soils represent a great potential to
sequester carbon with in the soil system, directly
by enhancing their primary productivity by
improving the soil physico-chemical properties and
indirectly by lowering the emission of CO2 into the
atmosphere. Adoption of resource conservation
technologies like zero tillage, residue application,
permaculture, judicious use of fertilizers, salt
tolerant varieties will further enhance the potential
of these lands to sequester carbon. Thus, not only
salt affected soil but also other waste lands with
low productivity can play important role in the
current climate change scenario. The two prolonged
strategy of enhanced carbon storage in these lands
as well as boosting food security makes salt affected
areas strategically very important in terms of policy.
Development of efficient reclamation as well as
management technologies hold the key, though, to
the extent of benefits which can be achieved. The
immediate challenge is to understand threat and
level of impact of climate change in salt affected
soils, then to identify alternative management
practices, their life cycle assessment, inculcating the
generated information into crop, climate and socio-
economic models and get the feedback to improve
the management (Fig. 3).
Understanding salt development mechanisms
in soils, under altered water and temperature
regime, is a key to developing sustainable
management. Life cycle assessments need to done
to reap long term benefits, rather than short term
yield based goals. The generated information need
to be continuous fed to farmers and policy makers
to get feedback on performances under large scale
production systems and varied climatic and
Fig. 3. Framework for adaptation to climate change effects for salt affected soils

28 BHARDWAJ et al. [Journal of Soil & Water Conservation 15(1)
landscape conditions. Salt development
mechanisms are complex and continuously driven
by landscape or watershed based management
changes. Under impacts at large scale will be crucial
to device sustainable strategies to meet the
challenge of mitigation and adaptation to climate
change. Salt affected marginal lands have a strategic
role to play in achieving the goal of enhancing
national food security by countering climate change
if these principles are followed.
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