Study On The Assessment Of Ecosystem Vulnerability In Collapsing District Of Anxi County

Collapse erosion is the most serious state of soil erosion,and it is also the most typical type of soil erosion in southern China.In Fujian province,which is famous for its high-quality ecological environment,there is also a large area of collapse erosion."China's tea capital"-Anxi County is a typical representative.Anxi County is the hometown of Chinese oolong tea.Tea is a supporting industry in Anxi County,it benefits more than 800,000 people.However,in the flourishing development of the tea industry,many intrusive environmental problems have also been encountered.The erosion of collapsed land is one of the most important factors.Anxi County is dominated by hilly hills.Most of the land is dominated by red brick soil,red soil and sandy soil.The soil structure is loose,and the erosion resistance is poor.In addition,the poor infrastructure and the unreasonable development and use of the tea garden lead to the-collapse.With a large area and a wide area,it has become one of the most heavily eroded areas in the province.Collapse erosion have caused severe damage to the ecosystem in Anxi County,constraining the development of social economy,seriously affecting people's production and living standards,and receiving high attention from leaders at all levels.Since 2000,many scholars have studied collapse erosion from the types,the distributive laws and the management methods,and have achieved remarkable results.It is of great significance to understand the quality of the ecological environment in the region,make rational use of natural resources,formulate scientific development strategies,alleviate the situation and promote the economic and social development of Anxi County.At present,the research on collapse erosion is mainly focused on how to deal with it after it occurrence.Due to the lack of a uniform and standardized collapse vulnerability evaluation index system,there are few studies on the assessment of ecological vulnerability in the collapse area.This article takes the collapsed area of Anxi County,which has been seriously damaged,as its research object.On the basis of a comprehensive investigation of the collapse area and collect relevant data.Based on the man-land coupling system,the ecological vulnerability assessment of the collapse area in Anxi County was conducted.The paper selects 10 townships,Guanqiao Town,Longmen Township,Longjuan Township,Changkeng Township,Gande Township,Hutou Township,Chengxiang Township,Jingu Township,Shennei Township,and Huqiu Town as evaluation targets.The collapse area of these ten towns and villages accounted for about 86%of the total erosion and collapse area of Anxi County.Therefore,based on these ten townships,it can be concluded that the general conclusions apply to the collapsed area in the county of Anxi County.Using GIS technology,data analysis,field survey,qualitative and quantitative methods to collect relevant data in the study area.Based on the basic principle of the man-land coupling system establish an evaluation index system for the ecological vulnerability of the area with collapse,vulnerability and resilience as primary indicators.Use the entropy method to determine the weight of the index evaluation system,Evaluation of the ecosystem vulnerability in the collapse area of Anxi county by comprehensive index method,find the ecologically fragile status of the collapse area in Anxi county.Combining geographical information technology to analyze the vulnerability of the ecosystem in the district.To discuss the impact of landfall on local ecosystems,to find measures to deal with the ecological environment in the collapse area.Finally,based on the results of the study,we propose some countermeasures to reduce the risk of collapse from the perspective of reducing geological disasters,improve the environment from the aspect of ecological engineering,and improve the economic benefits based on tea production.Provide reference for the management of ecological environment in the southern part of China,which is represented by Guangdong Province,Jiangxi Province,etc.The main results of the paper are as follows:(1)The collapse area of Anxi County is generally in the low fragile level,the average vulnerability index of the ecosystem is 0.425.The low fragile level townships in the ten evaluation units are:Longmen Town,Hutou Town,Gande Town,Jingu Town,Huqiu Town,Longjuan Township,and Changkeng County.with an area of about 83.27%,accounting for the largest proportion.Moderately fragile townships include:Guanqiao Town,Chengxiang Town,accounting for 13.55%.The slightly fragile towns and townships are within the township,accounting for 3.18%of the area,which is the smallest proportion.(2)The southeast district is more fragile than the northwest district in Anxi County.Judging from the distribution of ecosystem vulnerability,the collapse area of Anxi County,the southeast district is more fragile than the northwest district.The townships in the southeast like Guanqiao Town,Longmen Town and Chengxiang Town have stronger ecological vulnerability,and The townships in the Northwest like Changkeng Town,Jingu Town and Huqiu Town have weaker ecological vulnerability.From the distribution of the ecological vulnerability of Anxi County and the distribution of collapsing hillocks in Anxi County,the degree of coincidence is high,it shows that the large part of the vulnerability of the ecosystem in Anxi County is caused by the collapse erosion.To improve the ecological environment in Anxi County,the first solution to the ecological problems is to control the collapse of the collapse erosion.(3)The degree of vulnerability of the collapse area in Anxi County is determined by exposure,fragile,and resilience.These include natural factors and socio-economic factors such as:strong and frequent precipitation in Anxi County,geomorphology of hilly hills,frequent human activities with high elevation of 200-500m above sea level,large construction land area,and high population density As well as the tea industry in Anxi County,the tea planting area is large.The main causes of vulnerability of villages and towns at the same level are different.Some townships are ecologically fragile due to their high exposure,such as the towns of Gande and Hutou.Some townships are ecologically fragile due to their vulnerability,such as Chengxiang Township,Longjuan Township,and Huqiu Town;some townships are vulnerable due to poor resilience such as Jingu Town and Hutou Town.Whatever the reason,it can be attributed to the three categories of exposure,vulnerability,and resilience.