Review on supply and demand of ecosystem service and the construction of systematic framework.

The supply and demand of ecosystem services are related to both natural ecosystems and socio-economic systems. The research on the supply and demand of ecosystem services would help enhance ecosystem management and achieve optimal allocation of resources, which ensures regional ecological security and sustainable development of socio-economic. Based on a systematic review of international literature, we comprehensively reviewed the conceptual connotation, evaluation metho-ds, and practical application of ecosystem service supply and demand. Although relatively abundant investigations have been conducted from the perspective of theoretical development, they are still scattered and lacking a coherent research framework. Based on expanding the scope of research on the supply and demand of ecosystem service, we constructued a research framework that referred to "qualitative-positioning-quantitative-policymaking" in accordance with the research pattern of "theory-methodology-practice". To promote the theoretical and practical research on the supply and demand of ecosystem service, future research needs to focus on the spatial delivery mechanism, strengthen the research on quantitative methods, deepen the management and application practice, and establish the evaluation mechanism of ecosystem service supply and demand application.