RELATIONSHIP BETWEEN SPATIAL DISTRIBUTION OF SOIL EROSION AND ENVIRONMENTAL FACTORS IN YUEXI COUNTY

Taking Landsat TM of 2004 year as main data sources.Soil erosion intensity maps of 2004 year was interpreted from TM imagery.Making use of the ArcGIS software,soil erosion intensity maps and the maps of different environmental factors were served as overlay Analysis.Relationship between soil erosion and environmental factors are studied at 2004 in Yuexi County.The occurrence and development of soil erosion has been affected by the environmental factors.The occurrence and development of soil erosion has been affected by the environmental factors.From relations soil erosion and soil types,soil erosion occurs mainly in granite yellow-brown soil,yellow-brown soil of granite soil and brown soil on granite in Yuexi County.From different land use pattems,soil erosion is mainly occurred in the forest land,shrubbery,paddy field area and grassland of high cover degree.From the relationship between soil erosion and slope,soil erosion mainly occurs on the slope of 3°～25°,it is the majority Particularly on slope of 8°～25°.The area of greater than 35° of rarely occurs soil erosion.From the relations of soil erosion and aspect,soil erosion is to be serious on the northern slope of the mountains,southwest slope,western slope and north-west slope.From the relationship between soil erosion and elevation,soil erosion is not obvious in the area of elevation under 200 meters in Yuexi County.soil erosion is relatively significant area of 200 meters to 1 000 meters.It mainly registers as light erosion and moderate erosion,especially soil erosion emergence size is many in area of 500 meters to 1 000 meters.