Spatiotemporal Differentiation Of Ecological Vulnerability In Hefei City Based On PSR Model

Since the 21st century,the study of ecological vulnerability has gradually become one of the core issues in the field of global environmental change,and it is also an important basis for the evaluation of ecological issues and ecological restoration.According to the characteristics of the ecological environment of Hefei City,the data of land use,topography,meteorology and soil erosion in 2000,2005,2010 and2015,and the statistical data of population density,GDP density and industrial pollution of Hefei city are used to establish the health of Hefei city by means of remote sensing,model,field investigation,AHP and spatial analysis A set of scientific and practical evaluation index system of ecological vulnerability of Hefei city has been formed based on the environmental background database.The comprehensive and quantitative evaluation has been carried out according to the spatiotemporal differentiation law of ecological vulnerability of Hefei City,and the spatiotemporal change law of ecological vulnerability of Hefei City in the 16 years 2000-2015 has been revealed.The study of ecological vulnerability in Hefei will help to understand the impact of human activities on the ecological environment,reveal the law of temporal and spatial differentiation of ecological vulnerability in Hefei,which has guiding significance for the ecological restoration and reconstruction of Hefei,and promote the sustainable development of Hefei.The specific conclusions are as follows:From 2000 to 2015,the vulnerability of ecological environment in Hefei was mainly slight,which occupied the main position,supplemented by moderate vulnerability,and there were also a few high-quality micro vulnerable areas.The order of mild vulnerability from large to small is: Lujiang County > Feidong County >Chaohu City > Feixi County > Changfeng County > Shushan District > Baohe District > Luyang District > Yaohai district.Chaohu City,Luyang District and Yaohai District decreased,while the other counties increased.There is significant spatial heterogeneity in the ecological vulnerability of Hefei,and the spatial distribution of ecological vulnerability is different in different periods.On the whole,the ecological vulnerability of Hefei city is mainly slight,which is more and more fragile from the four sides to the center.The vulnerability in the north of Hefei city is higher than that in the south,especially in the center of Hefei city.In2000 and 2010,there was a very small area of extreme vulnerability in the center of Hefei city.Lujiang County and Chaohu City in the south of Hefei city are slightly vulnerable areas,and Chaohu City also has a slightly vulnerable area.Feidong County,Feixi County,Changfeng County and the edge of the city are mostly slightly vulnerable.With the change of time,many moderately vulnerable mixed areas have been increased.The urban center is mainly moderately vulnerable,and there are also severely vulnerable areas.At the beginning,Changfeng county is a mild vulnerable area.With the change of time,the area of moderate vulnerable area has increased.It is mostly distributed in the south of Changfeng County near the urban area,in the north of Changfeng County,and in the south of Changfeng County.The transition from mild vulnerable area to moderate vulnerable area indicates that the vulnerability of ecological environment changes is enhanced.At the same time,Feixi County and Feidong County also have the situation of light vulnerability to moderate vulnerability.With the urbanization process and the development of human society,the severely vulnerable areas can be expanded in the urban area.The expansion distribution trend is similar to the distribution of residential areas and the development direction of urban scale.Human activities need to pay attention to whether the ecological environment is damaged and whether the ecological vulnerability changes.