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High nitrogen deposition in an agricultural ecosystem of Shaanxi, China

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Abstract

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 (pNH4 + and pNO3 ) varied among 3.9–9.1, 6.6–8.0, 1.2–1.4, 3.1–4.3, and 3.3–4.8 μg N m−3, respectively, with mean values of 6.0, 7.2, 1.3, 3.8, and 4.1 μg 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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Acknowledgments

The research was financially supported by the National Natural Science Foundation of China (40675006, 40425007). We would like to thank Mr. Puhui Ji for his constructive comments and suggestions and Mr. Yimin Gao for helping us to draw the monitoring site distribution figure.

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Correspondence to Yan’an Tong.

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Liang, T., Tong, Y., Liu, X. et al. High nitrogen deposition in an agricultural ecosystem of Shaanxi, China. Environ Sci Pollut Res 23, 13210–13221 (2016). https://doi.org/10.1007/s11356-016-6374-1

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