| Ecosystem services are the benefits provided by ecosystems.Supply refers to the natural resources and services that are actually used in a certain range,and demand refers to ecosystem services that are consumed or used.With the development of 3S technology,the research on the spatial distribution pattern and relationship of supply and demand of ecosystem services has gradually become a hot topic.Selecting the Xilin River Basin as the research area,this paper uses remote sensing estimation of grassland production,RUSLE and InVEST models with GIS technology,combines field surveys and statistical data to calculate grass production,soil conservation,water conservation and ecotourism services in 2005,2010 and2015,and analysis capabilities and distribution characteristics of space-time of their supply and demand,so as to obtain its supply and demand in 2005-2015.The main conclusions are as follows:(1)From the distribution of time and space.The amount of grass production,soil conservation,and water conservation decreased from southeast to northwest during 2005 to 2015.(2)From the supply and demand capacity.The supply and demand capacity ofgrass demand decreased first and then increased,while the other three services increased in 2005 to 2015.Among them,from the basin scale,the biggest contribution in the grass production,soil conservation,and water conservation is upstream.From the vegetation type,the meadow grassland contributed the most in the grass production and soil conservation,and the sand vegetation was the highest in water conservation.(3)From the supply and demand situation.In rain dry year(2005),the balance between supply and demand of grassland and ecotourism services is basically balanced;Supply of soil conservation and water conservation service is less than demand.In rain average year(2010)and rain abundant year(2015),the supply of grass and soil conservation services is less than demand;supply of water conservation services is more than demand;and there are basic balance between supply and demand of ecotourism. |
