Analysis Of Regional Distribution Of Soil Resistance Index To Erosion In Jiangxi Province

Soil is detached and transported by water or wind in the process of soilerosion. Soil resistance index to erosion is referred to whether soil is susceptible toerosive force and the ability to bear detachment and transportation. In this thesis,two soil resistance index methods were used. Firstly, according to Universal SoilLoss Equation, K value was regarded as soil resistance index to erosion and Kvalue of red soil, loess, purple soil and black soil was calculated using artificialrainfall simulation experiments. Secondly, soil resistance index to erosion of redsoil, loess, purple soil and black soil was calculated using EPIC model. At last, soilresistance index to erosion with two methods were compared and the correctioncoefficient of EPIC model was obtained. Based on the second soil survey data ofJiangxi province, the traditional statistics and geostatistics methods was adoptedwithin GIS software, integrated and concised the standards and method of mappingon Provincial scale, prepared regional distribution of each soil indicators inresearch area. Then calculated soil resistance index to erosion, prepared andanalyzed regional distribution of soil resistance index to erosion. We get the mainconclusion as follows:(1)The correction coefficient of EPIC model is 1.04. (2)Within ArcGIS and GS+ software, the regional distribution of each soilindicators in Jiangxi Province was obtained:Regional distribution of clay content appeared the decreasing trend whichfrom the northeast, northwest, southwest and south to the central in research area,with the range from 5.50 to 58.10; Regional distribution of silt content appearedthe decreasing trend which from the northeast, north, west and central to the eastand south in research area, with the range from 16.01 to 69.18; Regionaldistribution of sand content appeared the decreasing trend which from the east,south, central and northwest to the northeast, north and west in research area, withthe range from 1.88 to 75.59; Regional distribution of organic matter contentappeared the decreasing trend which from the northwest to the east, southeast andsouth in research area, with the range from 0.34 to 15.15. Comparing with themean of clay, silt, sand, organic matter content of each soil class, both of them hadthe same discipline of regional distribution.(3)The spatial variability of soil resistance index to erosion in research area ismoderate difference, with the range from 0.1552 to 0.4323, mean of 0.2952, andvariance coefficient of 18.12%.We get regional distribution of soil resistance index to erosion by usingOrdinary Kriging interpolation. Its regional distribution appeared the increasingtrend which from the east, south and west to the central, north and northeast inresearch area. Comparing with the mean of the index of soil resistance to erosionof each soil class, all of them had the same discipline of regional distribution.The soil resistance index to erosion reflects the degree that soil resistance to erosion, the index is smaller, resistance to erosion is stronger. Therefore, regionaldistribution of soil resistance to erosion appeared the decreasing trend which fromthe east, south, west to the central, north and northeast in research area.