Study of Soil Erosion in the Southern Hillside Area of China Based on RUSLE Model
Soil erosion is a major ecological and environmental issue globally.As an important content of soil and water conservation,soil erosion by water is a primary cause of soil degradation and is significantly threatening the environment.Based on GIS and RUSLE models,we conducted quantitative research on the quantity and spatial distribution of soil erosion in four provinces (Hunan,Jiangxi,Zhejiang and Fujian) comprising the Southern Hillside Area.In addition,relationships between the distribution characteristics of soil erosion and influencing factors (e.g.slope and elevation) were analyzed.We found that the annual amount of soil erosion was 246 million tons and the mean soil erosive modulus is 421.81t/km2.Soil and water conservation good across the study area,and only 13.41％ of the soil erosion area has a higher degree of erosion.Spatially,soil erosion in Hunan and Jiangxi were characterized by a block distribution; soil erosion in Zhejiang and Fujian were characterized by a point distribution.Soil and water conservation in Hunan were worse than the other provinces.The degree of soil erosion in the study area was closely related to slope and elevation.At different levels of slope and elevation,the slight erosion had the largest area (more than 75％ of the area of soil erosion).Otherwise,the area of intense erosion and higher degree erosion was small compared to the slight soil erosion degree (less than 1.5％ of the total).The slope 15～25° and elevation from 20～500m suffered the most intensive erosion.
NETL
NSTL
万方数据
维普
