基于GIS的低丘缓坡建设对水土流失的影响--以昆明市西山区花红园区块为例

目的]研究低丘缓坡建设对水土流矢的影响。方法]采用地理信息系统(GIS)和RUSLE模型对昆明市西山区花红园低丘缓坡项目建设区开展前、后土壤侵蚀量变化进行量化分析,对项目区建设前、后在不同土地利用类型和不同坡度下的水土流失特征以及建设后水土流失对项目区周围生态环境、地表径流、未做土地平整区域的影响进行了研究。结果]建成后项目区总体水土流失现象得到极大缓解;保留植被因景观破碎化导致土壤流失加剧;建成后坡度5°的区域地表径流主要是沿着道路用地分布以及向道路的两边蔓延。结论]低丘缓坡项目建设用地建成后的侵蚀类型为极微度侵蚀。

Effects of Hilly Slope Construction Based on GIS on Soil Erosion-A Case Study of Huahongyuan Block in Xishan District in Kunming City

Objective] The aim was to study effects of slope construction on soil erosion. Method]Based on GIS and RUSLE model, the change of soil erosion amount before and after hilly slope construction in Huahongyuan, Xishan District in Kunming City was analyzed, soil ero-sion festures of different land use type and different slope were studied, as well as effects of soil erosion on eco-environment around the project ar-ea, surface runoff and level area. Result]The results showed that after hilly slope construction, soil erosion was greatly alleviated;due to land-scape fragmentation, preserved vegetation resulted in soil loss increase;the surface runoff in the region of slope > 5° was mainly distributed a-long the road and spread to both sides of the road. Conclusion] After construction of slope projects, soil erosion is minimal degree.