<正>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），对江阴市市城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CO!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/（m2?a）下降为699g/（m2.a）。其生志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g-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NPI，下降的影响较小。而气候变化产生的影响不明显。

The influences of 18 clones of Populus deltoides on the activities of digestive and protective enzymes in larva o{ Clostera anastomosis were studied. Results indicated that most of the resistant clones inhibited the activities of three digest enzymes in larvae of Clostera anastomosis statistically, while the three digest enzymes activity tested in No. 94-30, 94-12, 74--4 clones were higher than those of controls. The activity of superoxide dismutase (SOD) and catalase (CAT) in larva of Clostera anastomosis were higher than that of control statistically after feeding with resistant clones. However, no distinct effects of No. 94--30, 94--12, 74 4 clones on the activity of the two enzymes, even weak inhibition were showed. A significant relationship between peroxidase (POD) activity in larvae of Clostera anastomosis and certain clones of Populus deltoids did not exist. The results founded scientific basis for selecting new poplar strains worthy of extending in production.