Abstract
Globally, land degradation becomes a serious environmental issue in the context of anthropogenic pressure and climate change in the twenty-first century. Modeling and assessment of land degradation vulnerability assume a greater importance especially in the semi-arid ecosystems for sustainable land resource management. Consistent and reliable earth observation satellite datasets, Analytic Hierarchy Process (AHP), and Geographic Information System (GIS) are the powerful tools to model and assess the land degradation vulnerability. The present study was aimed to model and assess the land degradation vulnerability through analysis of Normalized Difference Vegetation Index (NDVI), Land Surface Temperature (LST), rainfall, terrain characteristics, and pedological parameters by using AHP and GIS in the semi-arid ecosystem of Rayalaseema region of southern India. The NDVI and LST products derived from time-series Moderate Resolution Imaging Spectroradiometer (MODIS) datasets, rainfall products from Tropical Precipitation Measuring Mission (TRMM), terrain characteristics from Shuttle Radar Topography Mission (SRTM) (30 m), and pedological parameters derived from legacy soil datasets were used in the study. The AHP- and GIS-based modeling shows that about 25.3 and 9.9% of the study area were under high and very high vulnerability to land degradation, respectively. Inadequate rainfall and vegetative cover, high temperature, problematic soils, and lack of adequate conservation measures were found to be the main causative environmental factors for land degradation in the study area. The study clearly demonstrates the potential of AHP- and GIS-based modeling in the assessment of land degradation vulnerability by using the time-series MODIS NDVI- and TRMM-based rainfall products, terrain characteristics, and pedological parameters.
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Acknowledgements
Authors of article are highly thankful to the US Geological Survey and NASA for providing free access of time-series MODIS (https://earthexplorer.usgs.gov) and TRMM data (http://trmm.gsfc.nasa.gov). Authors are also thankful to the Director, ICAR-National Bureau of Soil Survey and Land Use Planning, Nagpur, for providing the facilities to carry out the work. We sincerely thank anonymous reviewers whose constructive comments and suggestions greatly improved the overall quality of the manuscript.
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P. Sandeep: conceptualization, methodology, software, validation, and writing—original draft, review, and editing. G.P. Obi Reddy: conceptualization, methodology, software, validation, and supervision. R. Jegankumar: validation. K.C. Arun Kumar: validation.
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Sandeep, P., Reddy, G.P.O., Jegankumar, R. et al. Modeling and Assessment of Land Degradation Vulnerability in Semi-arid Ecosystem of Southern India Using Temporal Satellite Data, AHP and GIS. Environ Model Assess 26, 143–154 (2021). https://doi.org/10.1007/s10666-020-09739-1
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DOI: https://doi.org/10.1007/s10666-020-09739-1