title: Contribution of atmospheric nitrogen deposition to diffuse pollution in a typical hilly red soil catchment in southern China.
abstract: Atmospheric nitrogen (N) 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 55.8kgN/(ha·yr) across different land uses in the studied catchment, while the riverine N exports ranged from 7.2 to 9.6kgN/(ha·yr) in the forest sub-catchment and 27.4 to 30.3kgN/(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 NH4(+)-N or NO3(-)-N wet deposition and riverine NH4(+)-N or NO3(-)-N exports except for NH4(+)-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.
authors.affiliation: Changsha Research Station for Agricultural & Environment Observation, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Key Laboratory of Agro-Ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
authors.forename: Jianlin
authors.initials: J
authors.lastname: Shen
authors.affiliation: Changsha Research Station for Agricultural & Environment Observation, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Key Laboratory of Agro-Ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
authors.forename: Jieyun
authors.initials: J
authors.lastname: Liu
authors.affiliation: Changsha Research Station for Agricultural & Environment Observation, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Key Laboratory of Agro-Ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China. Electronic address: yli@isa.ac.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Changsha Research Station for Agricultural & Environment Observation, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Key Laboratory of Agro-Ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
authors.forename: Yuyuan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Changsha Research Station for Agricultural & Environment Observation, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Key Laboratory of Agro-Ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
authors.forename: Xuejun
authors.initials: X
authors.lastname: Liu
authors.affiliation: Changsha Research Station for Agricultural & Environment Observation, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Key Laboratory of Agro-Ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
authors.forename: Jinshui
authors.initials: J
authors.lastname: Wu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004787:Environmental Pollution / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis*; D058458:Nitrogen Cycle; D045483:Rivers / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D009584:Nitrogen
keywords: Dry deposition; Nitrogen deposition; Non-point source pollution; Riverine nitrogen export; Wet deposition