Soil erodibility indices under different land uses in Ri-Bhoi district of Meghalaya (India).

Abstract:

:In absence of soil erosion plots for determination of erodibility index (K) for erosion models like Universal Soil Loss Equation (USLE) or Revised Universal Soil Loss Equation (RUSLE) to estimate soil erosion, empirical relations are used. In the present study, soil erodibility index was determined for entire Ri-bhoi district of Meghalaya based on soil physical and chemical properties through empirical relationship and presented in a map form. Dominant land uses of the district were identified through geo-spatial tools which were viz. agriculture, forest, jhum land and wasteland. Soil samples from surface depth (01-15 cm) were collected from areas of different dominant land uses. Twenty five sampling points were selected under each land use type and geo-coded them on the base map of Ri-bhoi district. Apart from K-index, Clay Ratio, Modified Clay Ratio and Critical Soil Organic Matter were also determined for understanding the effect of primary soil particles on erodibility. In agriculture land use system K-index values were found in the range of 0.08-0.41 with an average of 0.25 ± 0.02. In case of jhum, forest and wasteland these were in the range of 0.08-0.42 with an average of 0.20 ± 0.01; 0.09-0.40 with an average of 0.22 ± 0.02, and 0.10-0.34 with an average value of 0.23 ± 0.02, respectively. Clay ratio (2.74) and Modified clay ratio (2.41) were observed to be higher in forest LUS, lower clay ratio (1.97) and modified clay ratio (1.81) were found in the wasteland indicating erosion susceptibility in forested area. The values of Critical Level of Organic Matter (CLOM) for the district ranged from 4.72 to 16.56. Out of 100 samples, only one sample had CLOM value less than 5 and rest 99 samples had values more than 5 indicating that the soils of the district had moderate to stable soil structure and offer resistance to erosion. All the indices values of geo-coded points were then interpolated in the Arc-GIS environment to produce land use based maps for Ri-bhoi district of Meghalaya. As K-index is a quantitative parameter which is used in models, the index can be then interpolated for estimation of soil erosion through USLE or RUSLE for any given situation.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Olaniya M,Bora PK,Das S,Chanu PH

doi

10.1038/s41598-020-72070-y

subject

Has Abstract

pub_date

2020-09-11 00:00:00

pages

14986

issue

1

issn

2045-2322

pii

10.1038/s41598-020-72070-y

journal_volume

10

pub_type

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