| Urban Agglomeration around Chang-Zhu-Tan is one of the important engines for the high-quality development of the urban agglomeration in the middle reaches of the Yangtze River.In the new era of accelerating the development of new urbanization and ecological civilization construction,it is of great significance to adhere to the "three high and four new" strategy of Hunan Province,create "three highlands",practice the "four new" mission,and strengthen the research on ecosystem service value evaluation of Urban Agglomeration around Chang-Zhu-Tan,so as to promote new urbanization and realize the high-quality development of urban agglomeration.In this study,the regional difference coefficient,biomass factor and social development coefficient were used to modify the ecosystem service value coefficient,and the ecosystem service value evaluation model of Urban Agglomeration around Chang-Zhu-Tan was constructed to reveal the spatiotemporal variation law of ecosystem service value of urban agglomeration in 2005,2010,2015 and 2018.Based on this,grid analysis and spatial auto-correlation analysis were used to study its spatial dependence.And then using geographic detector analyzes the effect of influencing factors on ecosystem service value from the perspective of spatial differentiation.This paper discusses the impact of urbanization process on ecosystem services in the study area,and finally puts forward corresponding suggestions for regulation and improvement.The main conclusions are as follows:(1)The value of ecosystem services in urban agglomerations is mainly provided by hydrological regulation services and biodiversity maintenance services.From 2005 to 2018,the individual services value has changed significantly,and the value of hydrological regulation,waste treatment,food production and aesthetic landscape has been declining,while the value of gas regulation,climate regulation,soil conservation,biodiversity maintenance and raw material production has been decreasing first and then increasing.There are differences in the service value provided by various ecosystems,and the service value provided by forest land,water and cultivated land system are the main services value of urban agglomeration.In 2005-2018 year,there are different characteristics of five ecosystems services value in each period.Among these changes,the cultivated land and grassland systems service value have always been in a decreasing trend,a “first increasing and then decreasing” process of water system service's value is presented,and the unused land system service value has also undergone a "increase-decrease-increase" fluctuation.From 2005 to 2018,the total value of ecosystem services in urban agglomerations has a trend of continuous reduction,and the reduction speed is accelerating.In 2005-2010,2010-2015,2015-2018 and 2005-2018,the total value of ecosystem services decreased by 1.0289 billion yuan,2.4849 billion yuan,2.8046 billion yuan and 6.3183 billion yuan respectively.(2)In terms of spatial distribution,from 2005 to 2015,the service value of per capita ecosystem in urban agglomeration was relatively stable,and the distribution feature of "high east-west and low middle" was presented.From 2015 to 2018,the per capita ecosystem service value of Shimen county and Anhua county increased from a higher level to a high level;You county increased from the general level to a higher level;the per ecosystem service value of Li county,Junshan district,Wangcheng district and Ningxiang city decreased,all of which decreased from the general level to a lower level.The spatial distribution of service value of the four major ecosystems in2005-2018 shows the distribution characteristics of "high east-west and low middle",but there are still some differences in some parts.The total value of ecosystem services is unbalanced in space,showing the distribution difference of "high in East and West,low in the middle,high in the South and low in the north".On the grid scale,there is always a significant positive correlation between the total ecosystem services value,the spatial agglomeration is significant,and the agglomeration changes have volatility.From 2005 to 2018,the total value of ecosystem services in urban agglomeration formed four typical gathering areas,which are high-high concentration,low-low concentration,low-high concentration and high-low concentration.(3)From the perspective of influencing factors,the spatial distribution of ecosystem service value in urban agglomeration is affected by both natural environmental factors and socio-economic factors,and the determinant q value of different factors is different;the interaction between influencing factors is conducive to enhancing the explanatory power of spatial-temporal differentiation of ecosystem service value in urban agglomeration.The order of single factor determinant q value from large to small is HAI > population density > per capita agricultural mechanization power > urbanization level > vegetation index > primary industry GDP > per capita GDP > elevation > slope > annual average temperature.Among the interaction factors,the q values of urbanization level,primary industry GDP,per capita GDP,per capita agricultural mechanization power,vegetation index and human activity impact index(HAI)were all above 0.5,the interaction between population density and HAI was the strongest(q = 0.8843),the interaction between per capita GDP and HAI was the second(q = 0.8564),the interaction between urbanization level and HAI is the third. |
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