PROGRESS IN EVALUATING THE GLOBAL ECOSYSTEM SERVICES
全球生态系统服务价值评估研究进展

Since there is a growing interest in the function of ecosystem services, it has a significance to assess the marginal value of ecosystem services. Many researchers have focused on the marginal value of ecosystem services by various approaches, in which great progress have been made. Most methods used in the studies are based, directly or indirectly, on assessing individual willingness to pay for the ecosystem services. To evaluate the global ecosystem services, the input output model of static general equilibrium and partial equilibrium are employed; then the value of regional ecosystem services has been primarily assessed in China. However, the further studies on ecosystem services are restricted by many factors, such as the complication of ecosystem services and their functions, different value judgements, imperfection of market, difficulties for positive studies, and so on. The in depth studies are suggested to be focused on: (1) values of different ecosystem services; (2) spatial heterogeneity of ecosystem services; (3) dynamic regional and global models concerning non linearity and threshold; (4)changing fiscal system and corresponding polices; (5)evaluation on projects considering the expenses of ecosystem services; (6)marginal effects of minor change at large scale and great change at small scale.