太湖氮磷大气干湿沉降时空特征

为了探索太湖氮磷营养盐干湿沉降特征及对太湖营养盐输入的贡献，于2011年不同季节采集太湖不同位点的大气干湿沉降样品，分析干湿沉降中氮（N）和磷（P）的形态和沉降量。研究结果表明，输入太湖的磷以干沉降为主，而氮以湿沉降为主。在太湖干沉降中总无机氮（TIN）占总氮（TN）的77.1%，溶解性磷（DIP）占总磷（TP）的77.9%。干沉降中TIN主要以NH+4-N为主。西太湖是TN与TP通过大气干湿沉降输入太湖的最高湖区。太湖全年大气TN沉降总量为20 978 t，TP沉降总量为1 268 t，因此，氮磷大气干湿沉降是太湖营养盐输入的重要来源之一。

Spatial-temporal Features of Atmospheric Deposition of Nitrogen and Phosphorus to the Lake Taihu

To probe atmospheric deposition characteristics of nitrogen and phosphorus nutrients in the Lake Taihu and their contributions to the lake,these were analyzed that various forms and fluxes of nitrogen and phosphorus of samples collected from different sites of Lake Taihu at different seasons in 2011.The results showed that phosphorus was mainly from dry deposition,whereas atmospheric rainfall was a major source of nitrogen into the Lake Taihu.The total inorganic nitrogen (TIN) accounted for 77.1% of total nitrogen (TN) in dry deposition,while dissolved total phosphorus (DTP) accounted for 77.9% of total phosphorus (TP).NH+4-N was a major source of TIN in dry deposition.The input of TN and TP from atmospheric deposition in the West Lake Taihu was the highest.The estimated annual atmospheric deposition fluxes of TN and TP in Lake Taihu during 2011 were 20 978 tons and 1 268 tons,respectively.Therefore,the atmospheric deposition of nitrogen and phosphorus was one of important nutrients sources to Lake Taihu.