中文摘要：

于2015年5月~2016年4月对湛江湾的雨水样品进行了收集,测定了雨水中NO2-、NO3-、PO43-和SiO32-的浓度,分析了它们的浓度及湿沉降通量的变化情况,并讨论了湿沉降营养盐对海水生态系统的影响.结果表明,受厄尔尼诺影响,调查期间的年降雨量明显高于多年平均降雨量.雨水中NO2-和SiO32-的浓度在夏季和秋季较高,NO3-和PO43-的浓度在春季和冬季较高,它们的湿沉降通量均在秋季最高(平均超过全年湿沉降通量的50%).降雨量、不同来源的气团、当地的人类活动情况等是影响湛江湾湿沉降营养盐浓度和通量的主要因素,秋季湿沉降通量最高与该季节有超强台风过境有关.雨水每年给湛江湾带来的NO2--N、NO3--N、PO43--P和SiO32--Si的量分别为2.04、292.4、8.13和45.8t.秋季雨水的沉降可能在短时间内对海水中的浮游植物生长有促进作用,其他季节的促进作用可能在短时间内不明显.

英文摘要：

The nutrients in atmospheric wet deposition in the Zhanjiang Bay and their impacts on the marine ecosystemswere studied based on the rainwater investigation from May2015to April2016.The results showed that the rainfallduring the year of investigation was significantly higher than the average annual rainfall due to the influence of El Nino.In rainwater,NO2-and SiO32-concentrations were relatively high in summer and autumn,while NO3-and PO43-concentrations were relatively high in spring and winter.The deposition fluxes of these nutrients were all highest inautumn,with a high average contribution(larger than50%)to the wet deposition fluxes in a whole year.These seasonalvariations were affected by rainfall,different sources of air masses,local human activities.A super typhoon passing by inautumn,which brought heavy rains,contributed much to the highest deposition fluxes of nutrients in autumn.The wetdeposition could bring2.04,292.4,8.13and45.8t/a of NO2--N,NO3--N,PO43--P and SiO32--Si into the Zhanjiang Bay.Their deposition in autumn might cause phytoplankton to increase in seawater in short period,while in other seasons thisphenomenon might be absent.