Analysis On The Spatiotemporal Evolution And Driving Factors Of Ecosystem Service Value In Jiangxi Province

With the rapid development of society and economy,changes in land use in Jiangxi Province have led to major changes in the value of ecosystem services,and ecological environmental protection is facing many problems.Under the background of advancing the construction of ecological civilization and building a beautiful China "Jiangxi model",research the spatiotemporal changes of land use and ecosystem service value in Jiangxi Province,reveal the degree of impact of land use on ecosystem service value,and explore the spatiotemporal changes of ecosystem service value The driving factors and the characteristics of temporal and spatial differences are of great significance for optimizing regional land use,improving regional ecological environment and promoting regional sustainable development.This paper takes the spatio-temporal change characteristics of land use and ecosystem service value in Jiangxi Province as the research object,and analyzes the dynamics of land use and the direction of land transfer to reveal the spatio-temporal change characteristics of land use in Jiangxi Province based on the current land use data in Jiangxi Province from2000 to 2020;Equivalent factor method,establishes the ecosystem service value evaluation model of Jiangxi Province,evaluates the ecosystem service value of Jiangxi Province;reveals the characteristics of ecosystem service value changes and spatiotemporal differences through Arc GIS visualization and hotspot analysis,and studies the spatial layout and spatiotemporal evolution of ESV in Jiangxi Province Difference;use sensitivity index,correlation analysis and the contribution rate of ecosystem service variation to reveal the degree of impact of land use change on ecosystem service value;finally,use multiple regression model and geographic weighted regression model(GWR)to construct the ecological system of Jiangxi Province The regression model of system service value driving factors reveals the temporal and spatial differences in the influence mechanism and degree of driving factors.The research came to the following conclusions:.(1)From 2000 to 2020,the overall characteristics of land use change in Jiangxi Province are: the area of wetland and construction land increased significantly,and the cultivated land,woodland,grassland,water area and unused land decreased;from the perspective of land use dynamics,the land use of Jiangxi Province The comprehensive dynamic degree of utilization is gradually increasing.The dynamic degree of land use from2010 to 2020 is significantly higher than that from 2000 to 2010.The order of the severity of changes in each category is as follows: construction land>unused land>wetland>water area>cultivated land>forest land>grassland;From the perspective of utilization transfer,in the past two decades,the land use changes in Jiangxi Province are mainly: cultivated land converted to construction land,cultivated land converted to forest land,forest land converted to construction land,forest land converted to cultivated land,grassland converted to forest land,grassland converted to cultivated land,of which cultivated land and forest land are for construction The main sources of land transfer,accounting for 54.39% and 25.46%respectively.(2)According to the natural conditions and grain output of Jiangxi Province,the ESV equivalent factor of Jiangxi Province was revised to be 1956.54 yuan/ha,and the ecosystem service value evaluation model of Jiangxi Province was constructed.The total ESV value of Jiangxi Province in 2020 is 609.546 billion yuan.From the perspective of ecosystem types,forest land has the largest ESV value,followed by water areas,and unused land is the smallest;as far as ecosystem service functions are concerned,regulating services are the main focus.The overall ESV showed a downward trend.During the study period,ESV decreased by 13.112 billion yuan,a decline of 2.11%.Based on the counties and grid scales,the characteristics of ESV temporal and spatial evolution in Jiangxi Province are discussed.The spatial distribution pattern of ESV is roughly "high in the north,low in the middle,and medium in the south".In most areas,the trend of ESV accumulation per unit area is not significant.ESV in 2010-2020 The change is stronger than that of 2000-2020.(3)Quantitatively analyze the impact of land use changes on the value of ecosystem services in Jiangxi Province through correlation analysis and ecological system variation contribution rate analysis.Among them,the change of wetland and water area has the most significant correlation with ESV,and the change of grassland area has no significant correlation with ESV;the water area has the largest contribution to ESV variation in Jiangxi Province,followed by forest land,and wetland is the smallest.(4)By constructing a multiple regression model and a geographically weighted regression model,the driving factors of the ecosystem service value in Jiangxi Province were analyzed,and the temporal and spatial differentiation characteristics and influence mechanisms of the driving factors were discussed.The research results showed that: total population,total GDP and forestry The overall impact of GDP on the value of ecosystem services in Jiangxi Province is negative,and the added value of the tertiary industry has a positive impact,that is,the development of the tertiary industry will promote the increase of ESV.Different driving factors have different influence mechanisms in different regions,and the response to driving factors in southern Jiangxi and other regions are quite different.