Study On The Relationship Between Supply And Demand Of Ecosystem Services In Liaohe River Basin

With the rapid development of social economy,human activities have had a profound impact on the natural environment.In September2015,on the occasion of the 90th anniversary of the founding of the United Nations,representatives o f all countries participated in and adopted the Transforming Our World:The 2030 Agenda for Sustainable Development,which is centered on achieving the global Sustainable Development Goals（SDGs）.In SDG15,it is clearly pointed out that the terrestrial eco system serves to purify water,conserve water and soil,clean air and maintain the stability of the whole earth’s life system.How to use the earth’s big data to sustainably manage forests,prevent desertification,stop land degradation,and contain the lo ss of biodiversity is an urgent issue.At the same time,human demand for ecosystem is getting stronger and stronger,which leads to the mismatch between the supply and demand of regional ecosystem services.Therefore,it is of great significance to establ ish and improve ecological compensation and quantify the supply and demand of ecosystem services within the region for the sustainable development of ecosystem services.Liaohe River Basin,as one of the seven watersheds in China,is located in the ecologically fragile and barrier area.Based on In VEST model,GIS,R language,Geo DA and root mean square deviation of liaohe basin in 2015 four kinds of ecosystem services,carbon storage,soil conservation service,food services,to quantify water production service supply and demand,based on the weigh the degree of synergy and ecosystem services of supply and demand matching spatial pattern of river basin ecosystem service evaluation,for the ecosystem and the sustainable development of social economy to provide theory support,the main conclusions are as follows:（1）In 2015,the total supply of water production services in the Liaohe River Basin was 5.1×10^{1 0}t,the total supply of food was5.5×10⁷t,the totalsupply of carbon storage services was 1.9×10⁹t,and the total supply of soil conservation services was 2.1×10⁹t.The total demand for water production service is 2.1×10^{1 0}t,the total demand for food is 1.5×10⁷t,the total demand for carbon storage service is 1.2×10⁸t,and the total demand for s oil conservation service is 1.2×10⁸t.（2）In 2015,the correlation coefficients of carbon storage supply,carbon storage supply and food supply,water production service and soil conservation service supply,food supply and soil conservation service supply were-0.81,-0.88,-0.51 and-0.41,respectively.There was a synergistic relationship between water production and food supply,and between carbon storage and soil conservation,with correlation coefficients of 0.51 and 0.41,respectively.There wa s a trade-off between the demand for soil conservation services and the demand for food,water production services and carbon storage,and the correlation coefficients were-0.95,-0.94 and-0.94,respectively.The synergistic relationship between water ser vice demand,food demand and carbon storage demand was 0.87,0.73 and 0.93.The results of root mean square deviation show that the degree of trade-off between ecosystem services is different in different regions and different ecosystems.Liaohe basin in 20 15（3）supply and demand than supply and demand than soil conservation,food supply,carbon storage service supply and demand ratio and water production service supply and demand ratio was 0.10,0.37,0.24 and 0.20,respectively,the ecological system of s upply and demand ratio of positive instructions on river basin scale,4 kinds of ecosystem services supply greater than demand,the supply and demand ratio of the largest food supply service.The spatial pattern of the four ecosystem service matching patter ns was significantly different:high-supply-high demand,low-supply-low demand,low-supply-high demand,and high-supply-low demand.