Contribution of atmospheric nitrogen deposition to diffuse pollution in a typical hilly red soil catchment in southern China  

作　　者：Jianlin Shen Jieyun Liu Yong Li Yuyuan Li Yi Wang Xuejun Liu Jinshui Wu 

机构地区：[1]Changsha Research Station for Agricultural & Environment Observation,Institute of Subtropical Agriculture,Chinese Academy of Sciences [2]Key Laboratory of Agro-Ecological Processes in Subtropical Regions,Institute of Subtropical Agriculture,Chinese Academy of Sciences [3]College of Resources and Environmental Sciences,China Agricultural University

出　　处：《Journal of Environmental Sciences》2014年第9期1797-1805,共9页环境科学学报（英文版）

基　　金：supported by the National Basic Research Program (973) of China (No.2012CB417105);the Key Deployment Program of the Chinese Academy of Sciences (No.KZZD-EW-11);the 100-Talents Program of the Chinese Academy of Sciences for Dr.Yong Li;the National Natural Science Foundation of China (Nos.41101247 and 41071151)

摘　　要：Atmospheric nitrogen （hi） deposition is currently high and meanwhile diffuse N pollution is also serious in China. The correlation between N deposition and riverine N export and the contribution of N deposition to riverine N export were investigated in a typical hilly red soil catchment in southern China over a two-year period. N deposition was as high as 26.1 to 55.8 kg N/（ha-yr） across different land uses in the studied catchment, while the riverine N exports ranged from 7.2 to 9.6 kg N/（ha-yr） in the forest sub-catchment and 27.4 to 30.3 kg N/（ha.yr） in the agricultural sub-catchment. The correlations between both wet N deposition and riverine N export and precipitation were highly positive, and so were the correlations between NH-N or NO2-N wet deposition and riverine NH4-N or NO3-N exports except for NH-N in the agricultural sub-catchment, indicating that N deposition contributed to riverine N export. The monthly export coefficients of atmospheric deposited N from land to river in the forest sub-catchment （with a mean of 14%） presented a significant positive correlation With precipitation, while the monthly contributions of atmospheric deposition to riverine N export （with a mean of 18.7% in the agricultural sub-catchment and a mean of 21.0% in the whole catchment） were significantly and negatively correlated with precipitation. The relatively high contribution of N deposition to diffuse N pollution in the catchment suggests that efforts should be done to control anthropogenic reactive N emissions to the atmosphere in hilly red soil regions in southern China.Atmospheric nitrogen （hi） deposition is currently high and meanwhile diffuse N pollution is also serious in China. The correlation between N deposition and riverine N export and the contribution of N deposition to riverine N export were investigated in a typical hilly red soil catchment in southern China over a two-year period. N deposition was as high as 26.1 to 55.8 kg N/（ha-yr） across different land uses in the studied catchment, while the riverine N exports ranged from 7.2 to 9.6 kg N/（ha-yr） in the forest sub-catchment and 27.4 to 30.3 kg N/（ha.yr） in the agricultural sub-catchment. The correlations between both wet N deposition and riverine N export and precipitation were highly positive, and so were the correlations between NH-N or NO2-N wet deposition and riverine NH4-N or NO3-N exports except for NH-N in the agricultural sub-catchment, indicating that N deposition contributed to riverine N export. The monthly export coefficients of atmospheric deposited N from land to river in the forest sub-catchment （with a mean of 14%） presented a significant positive correlation With precipitation, while the monthly contributions of atmospheric deposition to riverine N export （with a mean of 18.7% in the agricultural sub-catchment and a mean of 21.0% in the whole catchment） were significantly and negatively correlated with precipitation. The relatively high contribution of N deposition to diffuse N pollution in the catchment suggests that efforts should be done to control anthropogenic reactive N emissions to the atmosphere in hilly red soil regions in southern China.

关 键 词：Nitrogen depositionWet depositionDry depositionRiverine nitrogen exportNon-point source pollution 

分 类 号：X52[环境科学与工程—环境工程]