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

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 decision-making and reference for the implementation of the project.Under the guidance of ecological system theory and by using remote sensing techniques 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 provide 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.