中文摘要：

利用遥感影像、逐日气象观测记录等相关数据，应用基于过程的生物地球化学模型（BEPS），对江阴市市域范围内的土地利用状况及年净初级生产力进行了研究，并对植被系统CO2吸收功能的价值进行了估算。结果表明：1991—2002年，江阴市陆地生态系统的总平均NPP由818g／（m^2·a）下降为699g／（m^2·a），其生态系统服务的碳汇价值也下降了0．88亿元。期间江阴市建设用地面积扩张及由此导致的林地、农田面积萎缩，成为江阴市陆地生态系统年净初级生产力下降的主要原因，森林植被质量变化对区域NPP下降的影响较小，而气候变化产生的影响不明显。

英文摘要：

Net primary productivity （NPP） is the foundation of ecosystem services. Based on the Landsat TM/ETM＋imageries and daily meteorological data, the land use and land cover change （LUCC） of Jiangyin County were studied, and the NPP of terrestrial ecosystems was calculated with a process-based model, the economic value of COz assimilation was assessed by the methods of afforestation cost and carbon tax meanwhile. The results showed that the total mean＇NPP decreased from 818 g/（m^2· a） to 699 g/（m^2 · a） and the economic value of carbon assimilation dropped by 88 million yuan （RMB） from 1991 to 2002. The sprawl of residential area and the reduction of forest area and croplands during this period were the most important reason for the decline of mean annual NPP, the degradation of vegetation quality served as second factor, while the influence of climate changes was not noticeable.