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Atmospheric Wet Deposition Characteristics of Nitrogen and Phosphorus Nutrients in Taihu Lake and Contributions to the Lake

YU Hui1,ZHANG Lu-lu1,2,YAN Shu-wen1,LI Huan-li1,XU Jun3 1.Research Center for Lake Eco-environment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China 2.School of Municipal and Environmental Engineering,Jilin Architectural and Civil Engineering Institute,Changchun 130021,China 3.Donghu Experimental Station of Lake Ecosystem,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China  
To understand seasonal and spatial wet deposition characteristics of nutrients in Taihu Lake during precipitation,more than 230 precipitation samples were collected at ten monitoring sites from August 2009 to July 2010 in different regions around the Taihu Lake basin.Mass concentrations of total nitrogen(TN),dissolved total nitrogen(DTN),nitrate nitrogen(NO3——N),ammonia nitrogen(NH4+-N),total phosphorus(TP),dissolved total phosphorus(DTP) and dissolved inorganic phosphorus(DIP) in the precipitation samples were measured.The precipitation characteristics of nitrogen and phosphorus nutrients in atmospheric wet deposition,the deposition rates and their contributions compared with their counterparts from external loading of rivers to the lake were studied.The results indicated that the annual average mass concentration of TN in the wet deposition was 3.16 mg/L,in which that of DTN accounted for more than 70% of TN,with a major form of NH4+-N.The maximum values of TN appeared in the southern lake district,and the minimum in the north.The TP deposition mass concentrations were relatively lower,with an annual average value of 0.08 mg/L.Seasonally,mass concentrations of different forms of nitrogen in wet deposition in the five regions were high in winter and low in summer,although the wet deposition of different forms of nitrogen and phosphorus were all highest in summer.Spatially,the deposition rates of TN were relatively higher in the southern and eastern lake regions.The deposition rates of NH4+-N and NO3——N accounted for approximately 30.4%-52.0% and 31.6% of DTN,respectively,while the deposition rate proportion of DTP to TP varied greatly among these monitoring sites.The annual settlements of TN and TP in the precipitation were 10,868 and 247 t,respectively,accounting for 18.6% and 11.9% of the annual loading of rivers into Taihu Lake.These settlements could promote eutrophication and have strong impacts on the lake ecosystem.
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