Effect of Conversion of Cropland to Forestland on Soil Water Erosion and Land Use/Cover in Wuqi County

To study the impact of conversion of cropland to forestland project on land use change/cover and soil erosion in Wuqi County in this paper,based on 3Stechnology and RUSLE soil erosion model,the analysis and evaluation of the county,returning farmland to forest and land use/cover,the temporal and spatial changes of soil erosion were carried out.The results showed that the implementation of returning farmland to forestland in Wuqi County after 10years,various types of land use complex changes happened between cultivated land area,66.51%less than before returning cultivated land,forest area increased by 212.61%than before project,soil erosion was obvious controlled effect,the average soil erosion modulus was 9 779 t/(km2·a)before the project,and it was 5 285t/(km2·a)after the conversion of cropland to forestland,the reduction percentage was 45.96%,after conversion of cropland to forestland in the county to the annual reduction amount of soil erosion was about 1.704×107 t.Soil erosion and land use types were closely related,the most serious erosion occured on unused land,the average soil erosion modulus was 19 513 t/(km2·a),which is 22.79times of average modulus with 856t/(km2·a)in forestland;the study results will provide reference to soil erosion control and rational use of land resources in this region.