Effects of Structural Changes Land Use on Soil Erosion in the Yunmeng Lake Watershed
In order to investigate the influence of land use change on soil erosion over the Yunmeng Lake watershed,RS and GIS techniques were utilized and RUSLE model was selected to acquire soil erosion data.Transitional matrix was used to study the land use and the soil erosion level change.A soil erosion intensity index was introduced to quantify the relationship between land use change and soil erosion.On this basis,statistical regression method was used to study the soil erosion due to the changes of land use.The result showed that during the period of 1986-2010,farmland were the dominant land use type with reducing to 59％ from 63％.Land use changes were mainly caused by converting farmland or grassland to other land use types.Soil erosion situation had improved with the proportion of minima zones rising from 60.7％ to 61.7％ and the total proportion of strong,extremely strong and severe erosion zones decreasing from 16.9％ to 16.6％.Great changes happened for soil erosion with the change rate of moderate,strong and extremely strong as 50.54％,50.8％ and 47.34％ respectively.Soil erosion was mainly converted from the adjacent degrees.Soil erosion was affected by the different land uses.The transition of forestland to farmland and grassland were the primary causes for aggravating soil erosion.On the contrary,the transition of farmland to other land use types had alleviated the soil erosion.Moreover,a new dynamic assessment method for watershed soil erosion was proposed on the base of regression analysis and would propose more easy way for dynamic monitoring the soil erosion in the Yunmeng Lake watershed.
Land use changeSoil erosionRegression analysisYunmeng Lake
NETL
NSTL
万方数据
维普
