A Research On Ecological Vulnerability Evaluation Based On PSR-AHP-GRA Model

With the rapid development of the economy and the increasing frequency of production activities,human influence on the ecosystem has become greater and greater,and the damage to the ecological environment has become increasingly serious.Since the 19 th CPC National Congress,the state has paid more and more attention to the protection of the ecological environment,and has paid more and more attention to the protection and research of nature reserves.This paper takes the Dongzhaigang Mangrove National Nature Reserve in Hainan Province as the research area to carry out ecological environment vulnerability assessment research,obtains the ecological environment vulnerability status and existing environmental problems in the study area,puts forward corresponding suggestions for environmental protection work Provided references,the research mainly achieved the following results:(1)Based on previous studies on ecological environment vulnerability assessment,summarize the principles for selecting evaluation indicators,and based on the actual ecological environment characteristics of the study area,based on the pressure-stateresponse model(PSR),from human activities,meteorology,hydrology,13 geological,land cover,and socio-economic aspects were selected to construct 13 ecological environment vulnerability assessment systems.(2)Collect remote sensing image data,meteorological data,geological data,and statistical yearbook data according to the needs of the evaluation index system,and use remote sensing and GIS technology to perform information processing,extraction,and spatial analysis on the acquired data,and conduct slope Information extraction,temperature and precipitation interpolation,interpretation of land use types,etc.,completed the extraction of information for each evaluation index in the study area,and produced an information map of each evaluation index.(3)Considering the subjectivity and poor accuracy of traditional evaluation methods such as index-weighted comprehensive methods,this paper introduces the Grey Relational Analysis Model(GRA)to the study of ecological environment vulnerability assessment.First,the analytic hierarchy process((AHP)determine the evaluation index weight value,then use the GRA model to obtain the gray correlation projection weight value,and then use the GRA model to calculate the correlation coefficient of each evaluation index of each evaluation unit,and then obtain the ecological environment vulnerability index and classify it to obtain the study area.Eco-environment vulnerability assessment map.(4)Analysis and evaluation results show that the overall ecological environment in the study area is low in vulnerability and the quality of the ecological environment is good.The area with low ecological environment vulnerability accounts for 90.85% of the total area of the study area.Analyze the ecological environment vulnerability distribution and influencing factors in the study area,and then provide suggestions and references for ecological environment protection and development in the study area.