Spatio-temporal Variation Of Soil Erosion In Sanchuan Basin

To study soil erosion in the Loess Plateau Soil Erosion data,we use remote sensing and geographic information system method. The Sanchuanhe soil erosion emporal dynamics in 1990 and 2010 were t analysis can provide the theoretical basis and reference for soil and water conservation and environmental protection in the Loess Plateau region of small watershed.It mainly includes the following:1 Acquired Sanchuanhe soil erosion factor LS Slope length factor, R rainfall factor, K soil erodibility factor, P factor, and soil and water conservation measures factor C and vegetation management, and create a spatial database for data in Geodatabase ArcGIS10 in management.2 Through the transfer matrix method to study changes in the relationship between time and space 20 years of erosion of soil Sanchuanhe watershed study,we found that the overall results were poor state of soil erosion Sanchuanhe basin, the main type of erosion erosion erosion of the following types of moderate, the intensity of erosion mainly located above Sanchuanhe River Basin, the transfer matrix display violent-very strong-strong-moderate-mild-micro degrees in one direction gradually turn for the better. The results show, after 20 years of governance average erosion modulus by 4709.93t/km2·a down to 4070.94 t/km2·a.3 In this paper, a high degree of soil erosion in the poster, terrain slope, land use and other environmental factors covering distribution. The results show that the height of 1200m poster below at 15°above the terrain slope, land use types, such as grassland and unused area is the most serious area of soil erosion, soil erosion from the point of view is best Dongchuan River sub-basin and watershed Beichuanhe the eastern mountains, the worst is Sanchuanhe the River.