Changes of nitrogen deposition in China from 1980 to 2018

文献类型： 外文期刊

第一作者： Wen, Zhang

作者： Wen, Zhang;Xu, Wen;Li, Qi;Han, Mengjuan;Tang, Aohan;Zhang, Ying;Zhang, Fusuo;Liu, Xuejun;Luo, Xiaosheng;Shen, Jianlin;Wang, Wei;Li, Kaihui;Pan, Yuepeng;Zhang, Lin;Li, Wenqing;Collett, Jeffery Lee, Jr.;Zhong, Buqing;Wang, Xuemei;Goulding, Keith

作者机构：

关键词： Reactive nitrogen; Atmospheric deposition; Ammonia; Air pollution; Emission control

期刊名称：ENVIRONMENT INTERNATIONAL （ 影响因子：9.621； 五年影响因子：10.72 ）

ISSN： 0160-4120

年卷期： 2020 年 144 卷

页码：

收录情况： SCI

摘要： China has experienced a dramatic change in atmospheric reactive nitrogen (Nr) emissions over the past four decades. However, it remains unclear how nitrogen (N) deposition has responded to increases and/or decreases in Nr emissions. This study quantitatively assesses temporal and spatial variations in measurements of bulk and calculated dry N deposition in China from 1980 to 2018. A long-term database (1980-2018) shows that bulk N deposition peaked in around 2000, and had declined by 45% by 2016-2018. Recent bulk and dry N deposition (based on monitoring from 2011 to 2018) decreased from 2011 to 2018, with current average values of 19.4 +/- 0.8 and 20.6 +/- 0.4 kg N ha(-1) yr-(1,) respectively. Oxidized N deposition, especially dry deposition, decreased after 2010 due to NOx emission controls. In contrast, reduced N deposition was approximately constant, with reductions in bulk NH4+-N deposition offset by a continuous increase in dry NH3 deposition. Elevated NH3 concentrations were found at nationwide monitoring sites even at urban sites, suggesting a strong influence of both agricultural and non-agricultural sources. Current emission controls are reducing Nr emissions and deposition but further mitigation measures are needed, especially of NH3, built on broader regional emission control strategies.

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