Abstract
Research on ecosystem service supply and demand relations is necessary for effective ecosystem management and rational allocation of resources. Based on the Ecosystem Services Value Evaluation, calculation of Land Use Development Index(LDI) and Ecosystem Services Supply-Demand Ratio(ESSDR), the coupling pattern of ecosystem services supply and demand in the Chengdu-Chongqing Twin-city Economic Circle were described. The results showed that the ESSDR in the researched area basically maintained a pattern of gradual improvement from the dual core to the peripheral circle in terms of spatial structure. An obvious inter-annual difference in the supply and demand patterns was also observed, which showed that the change trend of ESSDR before and after 2000 was opposite. The accelerated urbanization and population migration brought about by the Western Development Strategy exacerbated the imbalance between supply and demand of ecosystem services, the relationship between supply and demand of ecosystem services show an overall negative correlation, but there were obvious regional difference. The coupling status was significantly greater in the southern Sichuan urban agglomeration than others in terms of the quantitative characteristics.
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