Soil Erosion Assessment Of Dong Fang Hong Watershed In He Gang，hei Long Jiang Province Based On RS And GIS

A series of problems caused by soil erosion are affected by more and more people. TheSoil erosion can directly cause the loss of soil nutrients and break the sustainable developmentof ecology. It is the disaster of agricultural production. He Gang is the typical black soilregion of China. The grain output value of black soil is accounted for one-third of our countryevery year. Keeping the land and the water, the prevention of the loss with soil nutrients mustbe solved. This paper uses the technology of GIS and RS combine with the soil erosion andthe loss of the nutrients. There is a big significance for soil conservation work for this paper.This study chooses the area of small watershed Dong Fang Hong in He Gang. Using theremote sensing image data of ALOS and WorldView2of2012, the spatial resolution of theALOS is10m and the WorldView1is0.5m.Basing on the rainfall data、DEM data、soil datathis paper uses three methods to calculate the soil erosion such as SL190-2007、USLE andCSLE. Three methods verify each other. The results as follows:1. Translation the land use and the protection measures of soil erosion with the fieldvalidation.2. Building the database of the causes of the soil erosion. Choosing each factor to madethe map in order to show its spatial distribution.3. To calculate the soil erosion this paper uses three ways, every method tests and verifyeach other. The study was mainly eroded by mild and moderate. Using the model of USLE,the total annual erosion was36776.54t in2012.4. The mild and moderate erosion was located in the Midwest of this region, the terrainslope was between3°and5°.5. Calculating the potential erosion of this study region. Following as the spatial analysis,the type of potential soil erosion mainly as very strong, accounting for53.17%.6. Predicting the soli nutrient loss of this region，according the model to calculate theloss of total N, phosphorus, potassium, organic matter. Showing the maps of spatialdistribution with each nutrient. The loss of organic matter was about2454.6t.Total nitrogenloss was about330.6t.Total phosphorus loss was about89.4t.The loss of total potassium wasabout227.1t.