兰州市土地利用变化及生态服务价值

以典型河谷型大城市兰州市为例，在RS和GIS技术支持下，剖析了1997-2009年该市各县区土地利用及其变化情况。在此基础上，参考Costanza等生态系统服务价值计算方法和中国陆地生态系统单位面积服务价值表，分析r近12年来研究区土地利用变化对生态系统服务价值的影响及其变化情况。结果表明：1997-2009年兰州市林地增长面积最大，主要来源于耕地的转出及两山绿化，其次为建设用地，主要是对耕地、草地和未利用地的占用；土地利用类型面积减少最大的是耕地，主要转变为林地、草地和建设用地。土地利用变化引起生态系统服务价值及GDP变化，其分别从1997年的59．99亿元，210．27亿元上升到2009年的61．52亿元，920亿元。总体呈增长趋势，表明该区域生态环境整体向良性方向发展。

Land Use Changes and Ecosystem Service Value in Lanzhou

Based on RS and GIS, the land use change of Lanzhou during 1997--2009, as a typical valley city, was analyzed on a county scale. According to Costanza ecosystem service value calculation method and China＇ s land ecosystem service value per unit area, the influence of land use change on ecosystem service value and its variation during the past 12 years were discussed. The results showed that from 1997 to 2009, the area of forest land increased significantly from the transformation of cultivated land and the afforestation in the mountain areas. The construction land area also increased from the cultivated land, grass land, forest land and unused land. The cultivated land area experienced a most significant decrease, with the transformation to forest land, glass land and cultivated land. The change of land use led to the variation of the ecosystem service value （ from 5. 999 billion yuan in 1997 to 6. 152 billion yuan in 2009 ） and GDP （from 21. 027 billion yuan in 1997 to 92 billion yuan in 2009 ）. The increasing trend indicated that the regional ecological environment turned to a benign status.