重庆市九龙坡区近20年土地利用变化的生态环境效应评价

Assessment of ECO-environmental Effects of Land Use Change in Jiulongpo District for Nearly 20 Years

以1988、2001和2007年三期landsat TM/ETM影像解译数据为依据,分析九龙坡区近20年来的土地利用变化,并参考Costanza以及谢高地等提出的生态系统服务价值系数,对九龙坡区的生态系统服务价值进行了估算。结果表明:九龙坡区在1988-2007近20年间,林地、耕地大量向建设用地转化,生态系统服务价值降低。ESV由1988年的4.322 8×108元减少到2007年的3.278×108元,年减少率为1.27%;生态系统单项价值服务中,所有单项服务价值均呈下降趋势;生态服务价值系数的变化对九龙坡区生态系统总服务价值的影响缺乏弹性,说明研究结果可信。

Based on the data of Landsat TM/ETM in 1988,2001 and 2007, the paper analyzed land use/ cover change of nearly twenty years in the past in Jiulongpo district. The ecosystem service values（ESV） was estimated by using Costanza＇ s and Xie Gaodi＇ s coefficient of the ESV. The result indicated that the ESV descended as a result of the great loss of woodland and cultivated land for urban construction after Chongqing became municipality directly under the Central Government. The ESV of Jiulongpo district descended from 4.322 8 × 10^8 Yuan in 1988 to 3. 278 × 10^8 Yuan in 2007 ,and the annual descending ratio was 1.27% ,all individual ecosystem service values showed the downtrend and the result was reliability because the change of the ESV＇s coefficient made little influence on total ecosystem service value.