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Digital soil mapping of soil organic carbon stocks in Western Ghats, South India

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Title Digital soil mapping of soil organic carbon stocks in Western Ghats, South India
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Creator S. Dharumarajan , B. Kalaiselvi , Amar Suputhra , M. Lalitha , R. Vasundhara , K.S. Anil Kumar , K.M. Nair , Rajendra Hegde , S.K. Singh , Philippe Lagacherie
 
Subject Digital soil mapping SOC stock Western Ghats Quantile Regression Forest Cross validation Multiple soil classes
 
Description Not Available
Spatial information of soil carbon storage at national and global level is essential for soil quality and environmental
management. Improved knowledge on the amount and spatial distribution of the carbon stock in soils is crucial
in estimating changes in the terrestrial carbon dynamics and management options for carbon-storing. A
study was conducted to map the soil organic carbon stock (SOC) over 56,763 km2 area of Western Ghats of
south India using a digital soil mapping approach. Landsat data, terrain attributes, and bioclimatic variables
were used as covariates. Equal-area quadratic splines were fitted to soil profile datasets to estimate soil organic
carbon stock at six standard soil depths (0–5, 5–15, 15–30, 30–60, 60–100 and 100–200 cm) and Quantile Regression
Forest (QRF) algorithmwas used to predict the SOC stocks. Prediction of SOC stock was better for surface
layer (R2 = 31–43%) and the performance was decreasing with depth (R2 = 7–21%). The modal performance
was also compared with SoilGrids products. Although the spatial patterns were similar, the present predicted
SOC maps outperformed SoilGrids products in terms of both R2 and RMSE. The predicted total soil organic
stock in the Western Ghats ranged from 7.1 kg m−2 to 30.9 kg m−2 and the total estimated SOC was 917 Tg.
The present high resolution SOC maps help to assess and monitor the soil health and preparation of proper
land use planning
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Date 2021-07-24T13:19:42Z
2021-07-24T13:19:42Z
2021-03-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/49908
 
Language English
 
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Publisher Not Available