High concentrations and dry deposition of reactive nitrogen species at two sites in the North China Plain |
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| Authors: | JL Shen AH Tang XJ Liu A Fangmeier KTW Goulding FS Zhang |
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| Institution: | aCollege of Resources and Environmental Sciences, Key Lab of Plant–Soil Interactions MOE, China Agricultural University, Yuanmingyuan Xilu 2, Beijing 100193, China;bInstitute for Landscape and Plant Ecology, University of Hohenheim, 70593 Stuttgart, Germany;cDepartment of Soil Science, Rothamsted Research, Harpenden, Herts AL5 2JQ, UK |
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| Abstract: | Atmospheric concentrations of major reactive nitrogen (Nr) species were quantified using passive samplers, denuders, and particulate samplers at Dongbeiwang and Quzhou, North China Plain (NCP) in a two-year study. Average concentrations of NH3, NO2, HNO3, pNH4+ and pNO3− were 12.0, 12.9, 0.6, 10.3, and 4.7 μg N m−3 across the two sites, showing different seasonal patterns of these Nr species. For example, the highest NH3 concentration occurred in summer while NO2 concentrations were greater in winter, both of which reflected impacts of N fertilization (summer) and coal-fueled home heating (winter). Based on measured Nr concentrations and their deposition velocities taken from the literature, annual N dry deposition was up to 55 kg N ha−1. Such high concentrations and deposition rates of Nr species in the NCP indicate very serious air pollution from anthropogenic sources and significant atmospheric N input to crops. |
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| Keywords: | Atmospheric pollution Dry deposition Reactive nitrogen species North China Plain |
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