Relation Between Land Use Change And Soil Erosion Change-Taking The Danjiangkou Reservior Area As An Example

There is a human land-use and land involved in a targeted production activities. Human activities on land use in different ways, to a certain extent the process of soil erosion-affected areas. Changes in land-use change of the original surface vegetation cover type, vegetation cover, soil erosion characteristics of the regional changes in land-use types and thus soil erosion intensity is an important basis for change.Application of GIS techniques greatly facilitates the study of soil erosion, the researchers developed a variety of remote sensing and GIS technology based on regional soil erosion model. A number of scholars at home and abroad to use the power of GIS in the evaluation of soil erosion has done a lot of research. GIS and soil erosion inccordance with the application of the model can be divided into three kinds: first, to GIS as a tool, using GIS model extraction factor requirements, and then in accordance with the model using the graphics requirements of GIS and map algebra operations, the calculation results;II is GIS and soil erosion model as two different systems, to study the combination of the two systems; third is to use GIS to develop new models or improve the existing model.In this study, the study area for Danjiangkou reservoir area, from a regional survey of soil erosion, the collection and processing in the region related to terrain, weather, land use and other data to remote sensing images, topographic maps, historical surveys and research data for the basic information source, through GIS analysis and processing to establish the basis of the database in the reservoir area, the study area combined with the measured data, simulation of the soil erosion situation in the region, in-depth analysis of soil erosion in land-use change and regional relations, identify the area of regional soil erosion and distribution, grasp the characteristics of the regional soil erosion. Danjiangkou reservoir area on the study of soil erosion is not only an important scientific significance, but also a very important practical value.ARCGIS with GIS software and statistical software, statistical analysis through clustering, have been 1980-2000 Danjiangkou reservoir area of different land use types of the corresponding impact on soil erosion levels, by comparing the three periods in a high, medium and low three the impact of level of soil erosion area under the percentage of total gross floor area, it could be changes in the direction of soil erosion from land-use change to reflect the status of land cover on soil erosion.Have a soil erosion hazard in 1980 and 2000 showed an upward trend, which reached its peak in 1990, and by soil erosion in 2000 have declined against the trend, but in 1980 compared with the selection of soil erosion hazard is still is on the rise. Show that the land use in 1980 and 1990, soil erosion is not conducive to harm reduction, and in 1990 and 2000, land-use approach to reducing harm from soil erosion.Danjiangkou reservoir area of land use and soil erosion has been effectively controlled. Reasonable implementation of the returning farmland to forests and grassland measures to increase regional vegetation cover, is the most effective measure of soil and water conservation. Especially in recent years, because of the proactive fiscal policy, increased the input of Soil and Water Conservation, various aspects of the work has also made remarkable achievements.