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High nitrogen deposition in an agricultural ecosystem of Shaanxi, China

文献类型： 外文期刊

作者： Liang, Ting 1 ; Tong, Yan'an 1 ; Liu, Xuejun 3 ; Xu, Wen 3 ; Luo, Xiaosheng 3 ; Christie, Peter 3 ;

作者机构： 1.Northwest A&F Univ, Coll Nat Resources & Environm, Xianyang 712100, Shaanxi, Peoples R China

2.Minist Agr, Key Lab Plant Nutr & Agrienvironm Northwest China, Xianyang 712100, Shaanxi, Peoples R China

3.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China

4.Henan Acad Agr Sci, Inst Plant Nutr Resources & Environm Sci, Zhengzhou 450002, Peoples R China

关键词： Atmospheric pollution;Reactive N;Dry deposition;Wet deposition;Seasonal variation

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

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收录情况： SCI

摘要： Atmospheric nitrogen (N) deposition plays an important role in the global N cycle. Data for dry and wet N deposition in agricultural ecosystem of Shaanxi in China is still imperfect; in this study, we continuously measured concentrations and fluxes of dry N deposition from 2010 to 2013 in Yangling district of Shaanxi province and wet N deposition from 2010 to 2012. The average annual concentrations of NH3, NO2, HNO3, particulate ammonium, and nitrate (pNH(4)(+) and pNO(3)(-)) varied among 3.9-9.1, 6.6-8.0, 1.2-1.4, 3.1-4.3, and 3.3-4.8 mu g N m(-3), respectively, with mean values of 6.0, 7.2, 1.3, 3.8, and 4.1 mu g N m(-3), respectively, during the entire monitoring period. The annual NH4+-N and NO3--N concentrations in precipitation ranged 3.9-4.3 and 2.8-3.4 mg N L-1 with the mean values of 4.1 and 3.3 mg N L-1. The NH4+-N/NO3--N ratio in rainfall averaged 1.2. Dry N deposition flux was determined to be 19.2 kg N ha(-1) year(-1) and the wet N deposition flux was 27.2 kg N ha(-1) year(-1). The amount of total atmospheric N deposition (dry plus wet) reached 46.4 kg N ha(-1) year(-1), in which dry deposition accounted 41 %. Gaseous N deposition comprised over 75 % of the dry deposition, and the proportion of oxidized N in dry deposition was equal to the reduced N. Therefore, the results suggest that more stringent regional air pollution control policies are required in the target area and that N deposition is an important nutrient resource from the atmosphere that must be taken into consideration in nutrient management planning of agricultural ecosystems.

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