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作 者 ：李波;宋晓媛;谢花林;郝利霞;张书慧

期 刊 ：应用生态学报 2008年 19卷 10期 页码：2251-2258

关键词：生态系统；

摘 要 ：以北京市平谷区1995年和2004年土地利用/覆被数据为基础，利用中国不同陆地生态系统单位面积生态服务价值表对平谷区生态系统服务价值进行了动态分析.结果表明：平谷区生态系统服务价值由1995年的3.291×10⁹元减少到2004年的3.044×10⁹元，变化幅度为-7.50%；耕地和水域面积的减少是该区生态系统服务功能丧失的最主要原因；研究区水域生态系统单位面积生态服务价值量最大，森林生态系统对平谷区生态系统服务价值的贡献最大；该区生态系统服务价值动态变化凸显出研究区土地利用结构的不合理性，应加大研究区森林、农田和水域面积的比重，严格控制耕地向建设用地的转化.作为北京市的应急水源地和生态涵养区，今后须加强对平谷区生态和环境保护力度，促进其经济社会可持续发展，以保障首都水资源和生态的安全.

Abstract:Based on the land use/cover data of 1995 and 2004, and by using ecosystem service value per unit area of different terrestrial ecosystem types in China, the dynamic changes of ecosystem service value in Pinggu District of Beijing were analyzed. The results showed that the total ecosystem service value of Pinggu District was decreased from 3.291×10⁹ yuan in 1995 to 3.044×10⁹ yuan in 2004, with a change rate of -7.50%. The decrease in the areas of farmland and waters was the primary cause of the loss in ecosystem service function. Aquatic ecosystem had the highest ecological service value per unit area, while forest ecosystem gave the greatest contribution to the total ecosystem service value. The dynamic changes of the ecological service value revealed the conspicuously irrationality of land use structure in the District. The area proportions of forestland, farmland, and waters should be increased, and the conversion from farmland to constructive land should be controlled strictly. As the emergency water source and eco-conservation division of Beijing City, Pinggu District should improve its eco-environment protection and economic development to support the ecological and drinking water source securities of the Capital Beijing.

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