基于RS和GIS的内蒙古多伦县土地利用变化对生态服务价值的影响

Impacts of Land Use Change on Ecosystem Services Value in Duolun County of Inner Mongolia Based on RS and GIS

采用内蒙古多伦县1987年、1995年、2000年和2005年的TM影像，运用GIS方法提取了各年的多伦县土地利用动态变化数据。采用中国陆地生态系统的服务价值测算方法对多伦县土地利用数据进行分析处理，测算了多伦县土地利用变化引起的生态系统服务价值变化。结果表明，1987—2005年间多伦县土地利用变化十分剧烈，耕地、林地、城镇用地、水域面积呈增加趋势，草地、未利用地面积呈减少趋势。土地利用类型主要由未利用地和草地向林地、耕地变更，并且草地和未利用地面积持续减少，林地和城镇用地面积呈持续增加趋势；多伦县生态系统服务价值1987～1995年间呈下降趋势，而1995—2005年间呈增加趋势，其生态系统服务价值处于可持续发展状态；耕地、林地和草地生态系统服务价值占多伦县总生态系统服务价值的比例较大，耕地、林地和水域的生态系统服务价值均呈增加趋势，而草地和未利用地生态系统服务价值呈减少趋势；各土地利用类型生态系统服务价值敏感性指数都小于1，表明多伦县生态系统服务价值对服务价值指数缺乏弹性，研究结果可信。

Based on TM image data in 1987,1995,2000 and 2005 of Duolun County,Inner Mongolia, supported by RS and GIS technology, land use change of Duolun County in each year were extracted. The land use data was studied by using the evaluation method of China terrestrial ecosystem services value, and the change of eco- system services value caused by the land use change of Duolun County was estimated. The results showed that the area of cultivated land, woodland, urban land use, water area had an increasing tendency while grassland, unused area decreased during 1987 to 2005. The land use types mainly shifted to woodlands, and cultivated land from unused land and grassland. The ecosystem services value of Duolun County had an increasing tendency in a state of sustainable development,it had a decreasing tendency during 1987 to 1995 and increased during 1987 to 1995. Cultivated land, woodland and grassland took the major part of the total ecosystem services value, the change of ecosystem services value of cultivated land, woodland and water area had a tendency of increasing while grassland and unused land declined. The ecosystem services value sensitivity index of each land use type is less than 1, indicates that the ecosystem services value of Duolun County lacks flexibility on its service value index.