Based On The RUSLE Model Xiangxi Rocky Area Of Soil Erosion Research

It is the the rocky desertification areas of high incidence,where is Xiangxi Provicnce,in order to understand the Formation Mechanism and risk.The Research are studied the soil erosion in the Longshan County. In this paper,it is estimate the soil erosion loss by the RUSLE application of GIS and RS,and analyze the spatial variation of soil erosion,and evaluate the degree of danger. This Research mainly studied is following.Based on rainfall,soil,DEM, remote sensing,soil and water conservation measures of Longshan County,determine the rainfall and runoff,soil erosion can,slope and slope length,vegetation cover and soil conservation measures and other factors influencing factors,and establish the county on a scale soil erosion quantitative evaluation system.Last,there is calculate the period of rainfall erosivity,the soil erodibility,slope length and slope, vegetation cover,soil and water conservation measures factor coefficients though the RUSLE model,and analysis the spatial variation.(1)Calculated study area landscape index use Fragstats3.3.Through the analysis of various land landscape index to determine where can occur soil erosion.Soil erosion in different landscapes within the study area is not the same for all types of landscapes are analyzed in Longshan County,learned woodland landscape can effectively mitigate soil erosion,agricultural land(dryland and irrigated),followed by the grass again;while construction land and unused land can accelerate soil erosion.(3)According RUSLE model make soil erosion modulus map of Longshan County in 2005,and calculating the average erosion modulus is 489.281t/(km2*a),and analyze the spatial variation.The results show that the study area are more serious soil erosion in the construction of multi-land and unused land; woodland almost no soil erosion. (3)According to soil erosion intensity of uniform standards for soil erosion map production were grading grading, erosion derived micro,mild erosion,moderate erosion,severe erosion,the area very severe and severe erosion area ratios were 78.51%,4.69%,1.15%,8.32%,7.33%.(4)Analyze the risk of soil erosion within the study area through the resist life hazard evaluation methods and SEPDI evaluation methods. Resist life risk assessment study area obtained without insurance type,light type insurance,dangerous type,very dangerous type,type area of destruction ratio was 71.97%,8.55%,11.93%,6.98%, 0.57%,SEPDI evaluation methods calculated SEPDI study area is 2.07.In this study, to understand the laws of the study area of soil erosion,and explore effective ways and means of preventing soil erosion,and for the further understanding of the evolution of soil erosion and soil erosion control rocky areas are important for the area of ecological environment construction and sustained and stable economic development providing scientific and technological support.