中文摘要：

2008年1月～2009年12月在舟山嵊泗群岛收集了92个雨水样品,测定了pH值、采用分光光度法测定溶解态NH 4＋、NO 3-＋NO 2-、PO34-和SiO32-的含量,探讨了大气湿沉降对东海低营养级生态系统的影响.结果表明,大气湿沉降中85%的样品pH〈5.0,对环境酸化有明显的影响.雨水中NH 4＋和NO 3-＋NO 2-的浓度较高,营养盐月平均浓度及降雨量随时间的变化较大.营养盐湿沉降通量在2 a中均具有明显的季节变化.DIN、PO43-、SiO23-的年沉降通量平均值分别为52.05、0.08、2.05mmol.（m2.a）-1.大气湿沉降中NO 3-/NH 4＋值为0.73,N∶P=684∶1,与东海陆架区表层海水的N∶P（10～150）有明显的差别,因此降水可能影响表层海水的营养盐结构、pH,进而影响到浮游植物的生长,甚至会引发赤潮.

英文摘要：

92 rainwater samples were collected at Shengsi Archipelago from January 2008 to December 2009.The pH and the concentrations of nutrients（NH＋4,NO-3＋ NO-2,PO3-4,SiO2-3） were analyzed using spectrophotometry to understand the impacts of the atmospheric wet deposition on the ecosystem of the East China Sea.The results showed that the pH of 85% samples were less than 5.0,and had significant effect on the environment.There were significant differences among monthly average concentrations of nutrients and rainfall and seasonal average wet deposition of nutrients in investigation periods.The annual average wet deposition flux was 52.05 mmol·（m2·a）-1 for DIN,0.08 mmol·（m2·a）-1 for PO3-4,2.05 mmol·（m2·a）-1 for SiO2-3.The average molar ratios of NO-3/NH＋4 is 0.73,N∶P ratio is 684∶1,indicating that nutrients composition in rainwater was different from seawater of the East China Sea Shelf（10-150）.The wet deposition may change the nutrients structure,pH and lead to change the phytoplankton production in the surface seawater of the East China Sea,even lead to the red tide.