基于RS的杭州市生态系统服务价值对土地利用变化的响应

Response of Ecosystem Services Value to Land Use Change in Hangzhou Based on Remote Sensing

以杭州市1990,2000,2006,2010年4期遥感影像为数据源,提取了杭州市4个时期的土地利用数据,分析了杭州市近20 a的土地利用变化情况。同时,参照中国陆地生态系统服务单位面积价值表,对杭州市基于土地利用的生态系统服务价值进行了分析。结果表明,杭州市1990—2010年间土地利用变化显著,建设用地大量增加,而林地、湿地显著减少,耕地、水体、未利用地面积均有不同程度的减少;研究期内杭州市生态系统服务总价值呈现持续下降趋势,但从其下降速度来看,呈现先加速后放缓的趋势,说明近年来杭州市采取的环境保护措施取得了一定的成效。

Based on the TM image of 1990, 2000, 2006 and 2010, the land use data of Hangzhou was extracted to analyze the land use change trend during the past 20 years. Then the ecosystem services value in Hangzhou based on the land use change was calculated according to the Chinese terrestrial ecosystem services value per unit area table. The results showed that land use change of Hangzhou was significant during 1990 and 2010. The construction land expanded dramatically, the woodland and wetland reduced significantly. At the same time, the arable land, water and unused land decreased in different degrees. During the past 20 years, the ecosystem services value in Hangzhou showed a continued downward trend. However, the decline rate increased firstly and then decreased. This illustrated that the environmental protection measures taken by Hangzhou government had produced a certain effect.