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A conceptual model of natural land degradation based on regressive pedogenesis in semiarid tropical environments

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Title A conceptual model of natural land degradation based on regressive pedogenesis in semiarid tropical environments
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Creator D.Vasu, P.Tiwary, P. Chandran, S.K. Singh, S.K. Ray, P. Butte, V. Parhad
 
Subject hydraulic conductivity, natural land degradation, pedogenic carbonate, pedogenic processes, subsoil sodicity
 
Description Not Available
Land degradation occurs in all the climatic regions, however, the adverse effects are
more pronounced in the semiarid tropical (SAT) environments due to increasing aridity
and water scarcity. Though natural processes can also cause land degradation, it is
generally attributed to anthropogenic factors. In this study, we elucidate the role of
climate and landscape driven soil forming processes in land degradation through a
conceptual model. For this, morphological, physical, and chemical properties of the
soils occurring in a part of the SAT Deccan Plateau region, India, were characterized.
The trend of climatic variables, namely, the mean annual rainfall, potential evapotrans-
piration, and maximum summer temperature during the last century (1901– 2010)
showed that the increase in aridity negatively influenced the soil forming processes.
The results showed that rainfall variability, temperature, potential evapotranspiration,
and hydrological behaviour of the SAT soils were the primary drivers of the soil
forming processes and they were identified through examination of the soil variability
by factor analysis. The depth distribution of selected indicators (% clay, pH, calcium
carbonate, exchangeable sodium percentage, exchangeable magnesium percentage,
and hydraulic conductivity) indicated that the current pedogenic processes operating
in the SAT environment caused the undesirable modification in soil properties.
Through our conceptual model, we discuss the mechanism of the formation of pedo-
genic carbonate, subsoil sodicity, and subsequent reduction in hydraulic conductivity
which leads to the land and vegetation degradation in the SAT environments.
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Date 2020-04-07T01:36:17Z
2020-04-07T01:36:17Z
2018-08-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/34501
 
Language English
 
Relation Not Available;
 
Publisher Wiley