Study On Ecosystem Service Value Based On Land Use Change

Evaluating ecosystem service value has a positive effect on the overall planning of urban and rural development and the construction of ecological civilization.It can effectively promote the orderly development of natural resources and achieve sustainable economic and social development.Based on RS and GIS technologies,taking Yulin as an example,explore the temporal and spatial dynamics of land use and ecosystem service value,under the background of energy resources development,ecological environment restoration and rapid urbanization.Build an ecosystem service value equivalent table of Yulin and revise it based on socio-economic and natural ecological conditions.Ecosystem service value was calculated by using equivalent factor method,based on grid's land use structure.Then analyze ecosystem service value of Yulin during 1982-2016.The main conclusions are as follows:(1)Grassland,cultivated land,forest land,and sandy land are the main types of land use in Yulin.Construction land and sand lands have expanded and contracted respectively.Land use status index are major fluctuations of bare land,gravel land and saline-alkali land,the remaining types of land use are relatively stable.Spatially,land use degree change in most regions is relatively gentle.Land use degree change index ranged from-2 to 2.6.Land use degree deepened areas are mainly distributed in the northeastern sand and southwestern regions,the weakened areas are mainly distributed in the central area of Yulin.Land use diversification was gradually deepened,the degree of diversification was mainly high and medium.The regions where the of land use diversification degree dramatic change is located in the west and north-central.(2)The value of ecosystem service in 1982,1992,2002,2013 and 2016 was: 5.258 billion Yua n,2.783 billion Yua n,7.881 billion Yua n,54.228 billion Yua n,and 44.130 billion Yua n.The sensitivity index of ecosystem services is less than 1,which shows that the research results are credible.Spatially,the highest value of ecosystem service is located on land with the slope of 6~15° in each year.Climate regulation,hydrological regulation and soil conservation are the main types of ecosystem service in Yulin.Ecosystem of farmland,forests and grasslands contributes most to ecosystem service value in each year,account for more than 80%.