IDENTIFICATION OF SOIL EROSION RISK AREAS FOR CONSERVATION PLANNING IN DIFFERENT STATES OF INDIA

Abstract

ASSESSMENT OF EROSION RISKS, EEPECIALLY IN THE DEVELOPING COUNTRIES IS A CHALLENGING TASK MAINLY DUE TO NON- AVAILABILITY OF INSUFFICIENCY OF RELEVANT DATA. IN THIS PAPER THE SOIL EROSION RISKS HAVE BEEN ESTIMATED BY INTEGRATING THE SPATIAL DATA ON POTENTIAL EROSION RATES AND SOIL LOSS TOLERANCE LIMITS FOR CONSERVATION PLANNING AT STATE LEVEL IN INDIA. THE EROSION RISK CLASSES HAVE BEEN PRIORITIZED BASED UPON THE DIFFERENT BETWEEN THE PREVAILING EROSION RATES AND THE PERMISSIBLE EROSION LIMITS . THE ANALYSIS REVEALED THAT ABOUT 50% OF THE TOTAL GEOGRAPHICAL AREA (TGA) OF INDIA , FALLING IN THE FIVE PRIORITY EROSION RISK CLASSES, REQUIRES DIFFERENT INTENSITY OF CONSERVATION MEASURES THOUGH ABOUT 91% AREA SUFFERS FROM POTENTIAL EROSION RATES VARYING FROM <5 TO >40 t ha-1 yr-1. STATEWISE ANALYSIS INDICATED THAT ANDHRA PRADESH, MAHARAHTHRA AND RAJASTHAN SHARE ABOUT 75% OF THE TOTAL AREA UNDER PRIORITY CLASS 1(6.4 M ha) THOUGH THEY ACCOUNT FOR ONLY 19.4% OF THE TOTAL AREA (36.2 m ha) UNDER VERY SEVERE POTENTIAL EROSION RATE CATEGORY (>40 t ha-1 yr-1) . IT WAS OBSERVED THAT ABOUT 75% OF TOTAL GEOGRAPHICAL AREA (TGA) IN THE STATE OF BIHAR , GUJARAT , HARYANA , KERALA AND PUNJAB DOES NOT REQUIRE ANY SPECIFIC SOIL CONSERVATION MEASURE AS THE POTENTIAL EROSION RATES ARE WELL WITHIN THE TOLERANCE LIMITS. THE DEVELOPED METHODOLOGY CAN BE SUCCESSFULLY EMPLOYED FOR PRIORITIZATION OF EROSION RISK AREA AT WATERSHED , REGION OR COUNTRY LEVEL.