岳西县土壤侵蚀空间分布与环境因子的关系

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

以岳西县2004年TM影像为数据源,通过目视解译的方法,得到2004年土壤侵蚀强度矢量图。利用Arc-GIS软件,将土壤侵蚀图与不同的环境因子图进行叠加分析,探讨了岳西县2004年土壤侵蚀空间分布与环境因子的关系。结果表明:从土壤侵蚀与土壤类型的关系看,土壤侵蚀主要发生在麻石黄棕壤、黄棕壤性麻石土及麻石棕壤上。从不同土地利用方式看,侵蚀土壤主要发生在有林地、灌木林、水田、高覆盖草地地区。从土壤侵蚀与坡度的关系看,土壤侵蚀主要发生在3°～25°的坡度上,尤其在8°～25°坡度上居多。从土壤侵蚀与坡向的关系看,山地的北坡、西南坡、西坡及西北坡容易发生土壤侵蚀。从土壤侵蚀与海拔的关系看,200～1000 m地区土壤侵蚀比较显著,尤其500～1000 m的地区土壤侵蚀发生量多。

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.