Study On Land Ecological Zoning Based On The Change Of Supply And Demand Of Ecosystem Services

In recent years,the rapid progress of industrialization and urbanization makes the land use/cover change dramatically,which not only leads to the obvious changes of the ecosystem structure under the influence of land use/cover,but also makes the ecological environment problems increasingly serious.The essence is the imbalance between supply and demand of ecosystem services.Therefore,at present,it is an urgent problem to study land zoning from the source of supply and demand of ecosystem services to promote the sustainable development of economy,society and ecological environment.Based on this,in this paper,Dafeng district of Yancheng city is taken as the research area.Based on the data of land use status in 1985,2000 and 2015,this paper analyzes the driving force of land use/cover change and its change in Dafeng district and its villages and towns in the past 30 years,references the quantitative matrix of ecosystem service supply and demand proposed by Burkhard,and constructs the profit and loss model of ecosystem service supply and demand in combination with the actual situation of the study area.Besides,on this basis,the changes of supply and demand and profit and loss of ecosystem services in Dafeng district are analyzed.Finally,by identifying the hot spots of supply and demand profit and loss of ecosystem services in Dafeng district,combined with the characteristics of different township land use and the change of supply and demand profit and loss of ecosystem services,this paper carrys out the land ecological division of dafeng district and puts forward management and control suggestions.The results are as follows:(1)On the whole,the land use/cover types in Dafeng district are mainly cultivated land,followed by water area and grassland.The cultivated land area decreased slightly in the 30 years,but the overall change was not significant.Except for Shanghai farm and Fangqiang farm,the degree of change in the last 15 years is more intense than that in the previous 15 years.In ecological land,The area of beach and grassland is decreasing,and the area of reservoir,pond is increasing.In each village and town,the land use/cover change is significantly different.The ecological land changes in Dazhong Town.Xituan Town and Economic Development Zone are mainly due to the increase of land for reservoirs and pits.In Dafeng port,Shanghai farm and other coastal villages and towns,it is mainly transformed from high covered grassland and beach to reservoir.pit.(2)On the whole,the relationship between supply and demand of ecosystem services in Dafeng district is in the short supply.In the past 30 years.the proportion of surplus area of ecosystem services had been decreasing,from 17.17%in 1985 to 8.81%in 2015.which had been reduced by half.Furthermore,the area of supply and demand deficit area has been expanding,from 2.11%to 6.8%.more than tripled.The profit and loss level of supply and demand of ecosystem services in villages and towns is mainly of supply and demand balance type.The profit and loss level of supply and demand shows a declining trend,and the latter 15 years is significantly lower than the former 15 years,but the decline mode and degree are pretty different.In Dafeng port,Shanghai farm,Caomiao town and other coastal areas,it mainly transforms from surplus supply and demand area to balance supply and demand area and deficit area.In other villages and towns,it is mainly from the supply and demand balance area to the supply and demand deficit area,but some villages and tow.ns have no obvious change.(3)On the basis of the above research results,this paper uses the local spatial autocorrelation method to identify the hot spots of supply and demand profit and loss of ecosystem services in Dafeng district,and combines the regional land use/cover and the change of supply and demand profit and loss of ecosystem services to divide the land of Dafeng district into ecological functions from the perspective of ecological supply and demand.It can be divided into three categories:ecological conservation area,ecological cultivation area and ecological restoration area,as well as seven secondary categories:core conservation area,priority conservation area,general conservation area,core cultivation area,priority cultivation area,core restoration area and priority restoration area.Besides,differential control suggestions are proposed according to the division.