Combined impacts of land use and soil property changes on soil erosion in a mollisol area under long-term agricultural development.

摘要: Soil erosion exhibits special characteristics in the process of agricultural development. Understanding combined impacts land use and soil property changes on erosion, especially area under long-term cultivations, is vital to watershed management. This study investigated temporal-spatial patterns based a modified version Universal Loss Equation (USLE) conducted contribution analysis. The data were interpreted from Landsat series images, properties obtained field sampling, laboratory tests SPAW (Soil-Plant-Atmosphere-Water) model calculations. Over long period development, average modulus decreased 187.7tkm-2a-1 1979 158.4tkm-2a-1 2014. types transformed mainly reclamation paddy fields shrinking wetlands large scale. Most soils converted loam silty or clay saturated hydraulic conductivity (Ks) most by 1.11% 43.6%. rapidly increasing 49.8km2 together with moderate decrease 14.0km2 forests, as well Ks values explained 87.4% total variance erosion. Although physical water indicated that loads should have become higher, upsurge played an important role mitigating this area. These results demonstrated had more significant than suggested rational measures be taken extend control dry farming. findings will benefit targeting