重庆市植被净初级生产力估算及其生态服务价值评价

Estimation of Vegetation Net Primary Productivity in Chongqing and Evaluation of Its Ecological Service Value

为了解重庆地区近年植被生态效应的变化格局与趋势,以重庆市为研究区,根据EOS/MODIS遥感资料,运用CASA模型估算重庆地区2002年-2011年的植被净初级生产力(NPP),并根据生态服务功能评价指标体系,对重庆市生态服务价值进行定量评估,结果表明:重庆地区2002年-2011年植被NPP均值为500.45g/m^2,常绿阔叶林达779g/m^2,在时间序列上呈波动下降的趋势.2002年、2005年、2008年和2011年的生态服务价值分别为337.97亿元、299.82亿元、357.92亿元和322.94亿元,土地利用类型中,林地的贡献率最大,其次是耕地和草地;在空间分布上,由大巴山山区所在的巫溪、巫山县及渝东南的石柱县、武隆县等区域向涪陵区及主城大片区域呈递减的趋势.

In order to understand the recent change patterns and trends of vegetation ecological effect in Chongqing,the vegetation net primary productivity（NPP）of the municipality from 2002 to 2011was estimated with the CASA model,based on the EOS/MODIS remote sensing data,and its ecological service value was quantitatively estimated according to the evaluation index system of ecological service function.The results showed that the average NPPin Chongqing region was 500.45g/m^2 from 2002 to 2011,and was as high as 779g/m^2 in broadleaved forests.A trend of fluctuating decline was observed in time series.The ecological service value was 33.797,29.982,35.792 and 32.294 billion RMB in 2002,2005,2008 and 2011,respectively.As far as the land use type is concerned,forest land makes the largest contribution,followed in order by farmland and grassland.As for the spatial distribution,the ecological service value of vegetation was found to diminish from Wuxi county and Wushan county in the Daba Mountains and from Shizhu and Wulong in the southeast of Chongqing to Fuling district and the city proper.