Change Around Hangzhou Bay And Its Response To Ecolo Gical Environment Vulnerability

In recent years,with the increasing economic level,China's ecological vulnerability has attracted much attention.Land use-cover change(LUCC)is the most direct manifestation and link of the interaction between the natural environment and human activities,while ecological vulnerability is also undergoing profound changes under the influence of both natural and human factors.The study of LUCC and its impact on ecological vulnerability is conducive to the further exploration of driving factors of ecological environment vulnerability,the rational planning of land use,and the basis for the protection of ecological environment.Based on the above research background,this study takes the Hangzhou Bay Area as the research area,selects the remote sensing impact data of the three phases of 2005,2010,and 2015 as the source,comprehensively uses GIS technology methods to build an ecological vulnerability assessment index system,the paper analyzes and evaluates the land use change and ecological fragility around Hangzhou Bay.The main conclusions are as follows:First,by analyzing the land use change in the study area,it is found that the proportion of land use types in the study area is ranked in order of forest land,cultivated land,construction land,water area,grassland,and unused land.From 2005 to 2015,the study area was dominated by forest land and cultivated land.The cultivated land area and water area decreased.The grassland area,construction land area and unused land area all increased,and the forest land area did not change much.Second,by analyzing the sensitivity,adaptability and exposure of the study area,it is found that the study area is in a slightly vulnerable area,and shows an increasing trend of ecological vulnerability year by year.Third,by analyzing the overall vulnerability of the study area and the ecological vulnerabilities of each administrative area,it was found that the ecological vulnerability of the study area was strong in 2005 and 2010,and significantly decreased in 2015,belonging to a slightly vulnerable area.In terms of administrative regions,Shengsi County,Dinghai District,Daishan County,and Xiangshan County have the highest ecological vulnerability rankings,and Putuo District has the most obvious increase in ecological vulnerability rankings.The area of ecological vulnerability in Yinzhou District and Qingpu District has the most obvious increase.Fourth,by analyzing the evolution of ecological vulnerability in the study area from2005 to 2015,it was found that the area of ecological vulnerability reduction in the study area was much larger than the increase area.Fifth,by analyzing and studying the impact of regional land use change on ecological vulnerability,it is found that different land use types have different impacts on ecological vulnerability.Cultivated land type has the most ecologically fragile area,and it is mainly moderate,while other types such as forest land are mainly lightly fragile areas.