南水北调中线工程陕西水源区生态环境质量综合评价

Comprehensive Eco-environmental Evaluation of Shaanxi Water Source Area in Middle-Route of South-to-North Water Transfer Project

对南水北调中线陕西水源区生态环境质量进行客观评价,可为南水北调工程的顺利实施提供决策和参考。利用RS和GIS分析方法,在生态系统理论的指导下,提取了研究区影响环境质量的6个因子图层数据,叠加形成一个综合环境指数图层数据,并将其划分为4个环境分区。从空间统计分析结果来看,综合自然指数Ⅰ,Ⅱ级最好,占整个水源区面积的64.69%,Ⅲ级较好,占整个水源区面积的31.52%;Ⅳ级区综合自然指数较差,占整个水源区面积的3.79%。对整个陕南水源区进行生态环境质量综合评价研究,能够对南水北调中线水源区生态补偿和水土保持建设提供数据支持和决策依据。

To evaluate the quality of eco-environment in Shaanxi water source area in the middle route of the south-to-north water transfer project objectively can provide the decisionlmaking and reference for the imple- mentation of the project. Under the guidance of ecological system theory and by using remote sensing tech- niques and the analysis methods of geographic information systems, the paper extracts six factor layer data affecting environmental quality in the study area, then stacks them to be the integrated environmental index layer data, and finally divides it into four environment divisions. From the result of spatial statistical analysis, the first and the second integrated natural indexes are the best, accounting for 64.69 percent of the total water area; the third is better, accounting for 31.52 percent; and the forth is poor, accounting for 3.79 percent. To evaluate and study the eco-environmental quality in Shaanxi Province comprehensively can pro- vide a data support and a decision-making basis for ecological compensation and soil and water conservation in the middle route of the south-to-morth water transfer project.