In order to explore the influence of wet nitrogen(N)deposition on N output in watersheds,this study selected a typical small watershed(Chenjiagou,CJG)in the Three Gorges Reservoir(TGR)area based on one-year observation of rainfall-runoff N forms.Characteristics and sources of N output were clarified by chemical statistics and isotopic abundance,and the contribution of N deposition to the N output was quantified by the output coefficient method.The N flux of wet deposition was estimated at 18.53 kg N ha-1 yr-1,and originated mostly from agricultural activities.Watershed N was significantly accumulated from upper to lower reaches due to frequent human activities.Seasonal changes of riverine N were strongly affected by chemical fertilizer,with the highest concentration in spring and the lowest in winter.Nitrate was mainly derived from chemical fertilizer,accounting for 38.83％of all sources.N concentration in processes of different rainfall events had a hysteresis effect corresponding to the flow rate.Three rainfall events greatly changed DTN(Dissolved total N)outputs:rainstorm caused 91.26 kg DTN output,which was 11 times that of moderate rain(8.46 kg)and 4 times that of heavy rain(20.80 kg).N deposition contributed 19.89％of riverine N output in the watershed.The results can provide theoretical support for the control of N pollution in the TGR area.

LU Chen-dong;ZHANG Liu-yi;YAN Kun;WANG Yu-kuan;XIONG Shan-gao;HUANG Chen-tao;LI Ting-zhen;NI Mao-fei

Chongqing Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir Area,Chongqing Three Gorges University,Wanzhou 404000,China;Institute of Strategic Planning,Chinese Academy of Environmental Planning,Beijing 100043,China;Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China;College ofEco-Environmental Engineering,Guizhou Minzu University,Guiyang 550025,China

山地科学学报（英文版）

[1]LU Chen-dong;ZHANG Liu-yi;YAN Kun;WANG Yu-kuan;XIONG Shan-gao;HUANG Chen-tao;LI Ting-zhen;NI Mao-fei-.Influence of nitrogen wet deposition on nitrogen output in a typical watershed in the Three Gorges Reservoir Area)[J].山地科学学报（英文版）,2022(08):2214-2225

Chenjiagou,CJG

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