盐城滨海地区生态系统服务功能的经济价值评估

Economic values evaluation for ecosystem service sesytem inYancheng coastal area

利用遥感影像,提取盐城滨海地区的土地利用数据并分析其土地利用特点,计算该地区单位面积农田生态系统的食物生产功能的经济价值,然后根据中国生态系统服务价值当量因子表并结合该地区的土地利用情况,对盐城滨海地区在1983和2001年的生态系统服务功能进行评估。2001年的生态系统服务价值比1983年增加约96.025亿元。18年间,该地区的土地利用方式从草地、湿地、水域等生态服务价值较高的土地利用类型向农田,建筑用地等生态服务价值低的土地利用类型转变,然而该地区整体生态系统服务价值却呈上升趋势。通过分析,这主要是由于农业生产水平的提高引起单位面积农田生态系统提供食物生产服务功能的经济价值(即Ea)增加,由此计算得出的各生态系统的单位面积服务功能经济价值也因此增加,从而该地区总的生态系统服务价值上升。综合分析得出,1983年至2001年盐城滨海地区开发利用政策基本是合理的,在以后的土地利用规划以及生态建设中,还应全面实施退耕还林、退耕还草,合理控制居民用地,积极有效地恢复和提高区域生态系统服务功能的价值。

The data of land use in Yancheng coastal areas was extracted,the characteristics of land use were analyzed by using remote sensing image of the areas,and the economic values of food production function of unit area farmland ecological system were calculated.Then the ecosystem service values of Yancheng coastal areas in 1983 and 2001 were evaluated,according to equivalent weight factor table of ecosystem services of terrestrial ecosystems in China and combined with the land use status in Yancheng coastal areas.The ecosystem services value in 2001 increased about 9.6025 billion yuan more than in 1983.During the 18 years from 1983 to 2001,the way of land use in this area changed from high value of types of land use,such as wetland and water area,to low value of types,such as farmland.However,the ecosystem service value of this area showed an ascendant trend.Through the analysis,this is mainly due to that the improvement of agricultural production level caused unit area of farmland ecosystem provides food production service function（that is,Ea） increase.Thus the unit area of each ecosystem service function economic value increased.In the end,the region overall ecosystem service value rose.Through comprehensive analysis,the policy of land use in Yancheng coastal areas is basically reasonable.In the following land use planning and ecological construction,we should return farmland to forests or grassland,and control the land for residential housing construction reasonably,and the ecosystem services values should be recovered and improved actively and effectively.