珠江口横门大气氮、磷干湿沉降的初步研究

Atmospheric deposition of nitrogen and phosphorus into the Hengmen of Pearl River Estuary

通过对2006年12月至2007年11月中山横门的大气沉降采样分析,初步探讨了珠江口大气氮、磷干湿沉降的特征。结果表明,观测期间铵态氮(NH4+-N)、硝态氮(NO3--N)、总氮(TN)、总磷(TP)降雨量加权平均浓度分别为0.82、0.52、2.14、0.039mg·L-1,干湿总沉降通量分别为1.584、1.142、4.295和0.055g.m-2.a-1。NH4+-N、NO3--N和TN干、湿沉降通量相当,而TP以湿沉降为主。TN大气沉降通量春、夏、秋三季相当,均明显高于冬季,TP则以夏季最大,秋季次之,而冬季最小。

To understand the characteristics of atmospheric nutrient deposition into the Pearl River Estuary, measurements of dry and wet depositions of nitrogen and phosphorus were made at Hengmen in Zhongshan from December 2006 to November 2007. Results showed that, on an annual basis, volume-weighted concentrations in wet deposition for ammonium nitrogen （NH4^＋-N）, nitrate nitrogen （NO3^--N）, total nitrogen （TN）, total phosphorus （TP） were 0.82, 0.52, 2.14, 0.039mg·L^-1, respectively; their corresponding annual deposition fluxes （dry ＋ wet） were 1.584, 1. 142, 4.295 and 0.055g·m^-2·a^-1, respectively. The budget of wet deposition corresponded with that of dry deposition for NH4^＋-N, NO3^--N and TN, and wet deposition was the major source for TE Seasonal change of total deposition fluxes for TN showed no significant difference among spring, summer and autumn, while that for TP was highest in summer, lower in autumn, and lowest in winter.