黄海千里岩岛大气湿沉降营养盐的研究

于2009~2010年对黄海千里岩岛的雨水进行了收集,测定了其pH值、NH4+、NO3- + NO2-、SiO32-和PO43-的含量,讨论了黄海西部湿沉降的酸雨状况、营养盐各组分浓度的变化特征、沉降通量以及对黄海初级生产力的贡献.结果表明,大气湿沉降中58%的样品5.6

Nutrients of atmospheric wet deposition from the Qianliyan Island of the Yellow Sea

Rainwater samples were collected at the Qianliyan Island of the Yellow Sea for the period of 2009-2010 and analysed for pH and nutrient concentrations (i.e. NH4+, NO3- + NO2-, SiO32- and PO43-). The results showed that the pH values in 58% samples ranged from 5.6 to 7.0, dominated by neutral depositions. Concentrations of nutrients had seasonal variations, higher in spring and winter but relatively low in summer and autumn. Based on comparison of inorganic nitrogen concentrations in rainwater at different regions, the air-mass back-trajectory and annual variations, atmospheric wet depositions over the Yellow Sea were affected by the anthropogenic emissions as well as sand-dust storms. Furthermore, the historical overview of existing data indicated that atmospheric dry and wet depositions of NH4+-N, DI(NO3- + NO2-), SiO32--Si and PO43--P account for 87%, 47%, 3% and 53%, respectively, of total terrestrial (i.e. atmospheric depositions and riverine influx) input. Rainfall in this region can dramatically increase surface water nutrient level that enhance the primary productivity.