基于遥感和GIS技术的区域土壤侵蚀量研究

Regional Soil Erosion Based on RS and GIS

基于RS和GIS,应用修正通用土壤流失方程估算土壤流失量,分析四川省泸定县某镇土壤侵蚀状况。结果表明,该地土壤平均年侵蚀模数为6 483t/(km2·a),整体属于强度侵蚀强度。微度侵蚀、轻度侵蚀、中度侵蚀、强度侵蚀、极强烈侵蚀、剧烈侵蚀,分别占总面积的25.94%、45.65%、11.72%、5.73%、3.81%、7.15%,其中剧烈侵蚀量占侵蚀总量的73.26%。研究区耕地-林地-未利用土地或其中2种组合的土地利用格局容易发生严重侵蚀(极强烈及强烈侵蚀),生产中应尽量避免。

Based on RS and GIS, soil erosion was calculated by the revised universal soil erosion equation in a town of Luding county in Sichuan province. The results indicated that average annual erosion was 6 483 t/（km^2·a）, and soil erosion was severe on the whole. The soil erosion areas under slight, light, moderate, severe, the more severe and the extremely severe degrees made up 25. 94%, 45. 65%, 11. 72%, 5.73%, 3.81% and 7.15%, respectively. The amount of the extremely severe soil erosion accounted for 73.26% of the total. The more severe and the extremely severe soil erosion were easy to happen in farmland-forest land-unused land and the combination of above two land use types, which should be avoided in the practice.