Study On Soil Erosion And Scenario Analysis Of Soil And Water Conservation Based On CSLE Model

Soil erosion is called "the peristaltic disaster",which is the most persistent natural disasters faced by mankind in today's society',and is the ecological and environmental problems that people pay more attention to.Ninghua County is one of the most serious soil erosion areas in Fujian Province.It is also a typical representative of water erosion in hilly areas of purple soil in South China.In this paper,the Xiejia small watershed of Ninghua County is the study area.The RS/GIS technique and the Chinese soil erosion model(CSLE)were used to evaluate the regional soil erosion.Using GIS method of dynamic analysis,to explore the relationship between the soil erosion intensity and environmental factors,based on this,revealed the soil erosion characteristics of Xiejia small watershed in Ninghua County.By analyzing soil erosion in Xiejia small watershed to reflect the soil erosion level under different scenarios,by comparing the advantages and disadvantages of scenarios,with a view to the Xie small watershed of Ningxia County to carny out comprehensive management measures,and provide scientific basis for the evaluation of soil erosion conservation effects,management and ecological environment restoration.The research and application of the model have practical significance to the western Fujian.The results indicate that micro-erosion and slight erosion is the dominant factor in Xiejia Small Watershed.Soil erosion is mainly happened in the semi-sunny slope and sunny slope area which lavation between 300 meters and 450 meters and slope greater less than 15 degrees.Soil erosion ratio had the tendency to decrease along with the increase of vegetation coverage.In the area where vegetation coverage higher than 75%,soil erosion ratio was almost close to zero for two years.In the year of 2013,soil erosion in some kinds of land-use types tend to be better than 2007.But the soil erosion ratio in bare land,shrub grasslands and garden land is still on the high side.Through the scenario analysis of soil erosion in Xiejia Small Watershed,Simulated soil erosion ratio under all scenarios alternatives is lowering than the soil erosion ratio in 2013 at different extends.The combination scenario of various measures of soil and water conservation has an obvious effect on decreasing soil erosion...