基于GIS的丰都三合水土保持生态园区土壤侵蚀危险性评价

在 ARC/INFO 8.0 2地理信息系统软件和 SPSS 10 .0的支持下 ,探讨了基于 GIS的土壤侵蚀危险性评价单元的划分方法 ,运用层次分析法和系统聚类法 ,对重庆市丰都县三合水土保持生态园区土壤侵蚀危险性作了评价。评价中综合考虑了影响土壤侵蚀危险性的各个因素 ,避免了仅仅根据土层厚度来衡量土壤侵蚀危险性带来的局限性和不确定性。结果表明 ,在三合水土保持生态园区 ,土壤侵蚀危险性主要受坡度、土层厚度和植被覆盖度 3个因素的影响 ;园区内危险型、强险型和极险型土地面积占园区总面积的 5 7.4 9% ,土壤侵蚀危险性大。在园区内进行退耕还林时 ,不宜过多的营造经济林 ,应经济林和生态林并重发展

Assessment on Danger of Soil Erosion in Sanhe Ecological Orchard Based on GIS

The method of dividing assessed units on the danger of soil erosion was inquired and the danger of soil erosion appraised in Sanhe ecological orchard,Fengdu county,Chongqing city by means of analytical hierarchy process and system cluster supported by the software of ARC/INFO 8.02 and SPSS 10.0. The factors affecting the danger of soil erosion were considered in an all round way and the limitation and indistinction was avoided during the process of assessment. Results showed that the danger of soil erosion was mainly subject to the three factors of slope, the thickness of soil and the degree of plant cover and the area of the dangerous type, the more dangerous type and the seriously dangerous type was 57.49% of the area of the entire orchard. Because of the danger of soil erosion ,it was not suitable that the excessively economical woods was planted and it was reasonable that the economical woods and the ecological woods were paid equal attention during the process of "planting woods after withdrawing cultivated land" in the ecological orchard.