Maximum Allowable Soil Erosion Rate under Different Land Forms of Uttarakhand
1Present address Division of Soil Chemistry and Fertility, Indian Institute of Soil Science, Nabibagh, Berasia Road, Bhopal, 462 038, Madhya Pradesh
2Present address Central Soil and Water Conservation Research and Training Institute, Kaulagarh Road, Dehradun, 248 195, Uttarakhand
Soil is fixed resource base and its conservation is important for very survival of human beings. The problem of land degradation in the state of Uttarakhand has been accentuated due to natural and anthropogenic factors. Under such circumstances, determination of maximum allowable erosion rate (‘T’ value) which cannot affect the crop productivity will be a useful tool for devising land restoration strategies for conservation planning. Therefore, the present investigation was carried out to ascertain ‘T’ values for different physiographic units of Uttarakhand by using bio-physical indicators such as soil permeability, bulk density, organic carbon content, erodibility and soil pH. Different scoring algorithms were used to convert data in 0–1 scale and aggregate scores were determined using weighted mean model. The ‘T’ value was computed using aggregate score vs depth matrix. Soils of the northern part of the state are very prone to erosion hazards as manifested by low soil loss tolerance limit, which ranged from 2.5 to 5.0 t ha−1 yr−1. About 58% area of the state has a tolerance value of 7.5 t ha−1yr−1, which comprised mostly southern part of the state. These ‘T’ values could serve as conservation planning tool for planners for devising suitable land restoration strategies.
Erosion, soil loss tolerance limit, land forms, conservation planning, Uttarakhand.