惠州大亚湾大气湿沉降中氮营养盐变化特征的研究

通过对降水中氮营养盐质量浓度及其沉降通量变化特征的研究，研究了大气湿沉降中氮营养盐对大亚湾水生生态系统的影响.结果表明，观测期间NH4+-N、NO3--N/NO2--N和TN降雨量加权平均质量浓度分别为0.474、0.536和1.23mg/L，氮质量浓度在8月份出现了明显的峰值；湿沉降通量分别为58.93、78.13和158.75kg/( km2.月)，其中无机氮占总氮含量的86.34%，大亚湾大气湿沉降中氮营养盐主要以NO3--N/NO2--N的形式存在.与2009年的观测结果相比较，2012年大气中氮的沉降通量增加了约1倍.通过大气湿沉降输入的氮营养盐在大亚湾水体富营养化过程中产生了重要作用，在研究水体富营养盐问题时应考虑降水的贡献.

Wet deposition of nitrogen in Daya Bay Huizhou

In order to understand the influence of nitrogen deposition on the aquatic ecosystem at Daya Bay, measurements of variations of concentration and deposition fluxes on precipitation were made. Results showed that, volume-weighted concentrations in wet deposition for ammonium nitrogen (NH4+-N), nitrate/nitrite nitrogen (NO3--N/NO2--N) and total nitrogen (TN) were 0.474, 0.536 and 1.23 mg/L, respectively, the nitrogen concentration peaked in August; their wet deposition fluxes were 58.93, 78.13 and 158.75kg/km2/month, respectively; inorganic nitrogen accounted for 86.34% of the total nitrogen. The nutrients in the atmosphere excited mainly in the form of NO3--N/NO2--N. Compared with the observations in 2009, the deposition flux of nitrogen increased about 1 times in 2012， The inputs of nitrogen from the atmosphere represented an important role in the process of eutrophication at Daya Bay. Therefore, the contribution of precipitation should be considered in the research of eutrophication.