A Research On The Ecological Environment Quality Evaluation In The Middle Yarlung Zangbo River-the Black-necked Crane Nature Reserve

With the rapid development of economy and the continuous progress of science and technology,the impact of human beings on the ecosystem is growing.While bringing huge economic benefits to society,it also destroys the ecological environment.It can be said that the rapid growth of economy brings various resources and environmental problems,and poses an important threat to the sustainable development of human society.In recent years,with the vigorous advocacy of ecological environment protection and the gradual improvement of people’s awareness of environmental protection,ecological environment problems have gradually become the focus of attention.Taking the Black-necked Crane Reserve in the middle reaches of the Yarlung Zangbo River as the research area,this paper carries out the research on the ecological environment quality evaluation and obtains the ecological environment quality status and existing environmental problems in the research area,which provides a reference for the ecological environment quality evaluation.The main achievements of the research are as follows:(1)By referring to the previous scholars’ research on the evaluation of ecological environment quality,the criteria and norms for the selection of evaluation indicators are summarized.According to the characteristics of ecological environment in the study area,natural geography,climate environment,regional geology and ecological environment quality are selected as the first-level evaluation indicators.A total of 12 second-level evaluation factors constitute the evaluation index system of ecological environment quality in the study area.(2)The technology of remote sensing information processing,extraction and spatial analysis is used to extract slope information,NDVI extraction,calculation of temperature and rainfall difference,supervisory classification and interactive interpretation.The information extraction of each evaluation index in the study area is completed,and the structure maps of each index factor are made.Through field investigation,the accuracy of index interpretation is verified,and the wrong information is processed.Correction.(3)Considering the limitation of the index weight assignment in the evaluation of ecological environment quality,this paper adopts the method of combining subjective and objective valuation,that is,using coefficient of variation method and analytic hierarchy process to determine the comprehensive weight value of the evaluation index,and using fuzzy evaluation method to carry out the evaluation of ecological environment quality in the study area,and finally obtains the evaluation result of ecological environment quality in the study area.(4)Through the analysis of the evaluation results,the overall situation of the ecological environment quality of the study area is good,and the good evaluation area accounts for 84.84% of the total area of the study area.The environmental quality of the three areas of the study area is analyzed,and the spatial distribution of the ecological environment quality grade and the main environmental problems are obtained,which can provide reference for the protection and development of the ecological environment of the study area.