Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China.
Environ Sci Pollut Res Int. 2018 Aug;25(24):24417-24425. doi: 10.1007/s11356-018-2346-y. Epub 2018 Jun 16.
China is one of three global hotspots for nitrogen (N) deposition, which has concerned scientists and the public. While previous studies on N deposition in China have focused on its composition, spatial pattern, and interannual dynamics, its monthly dynamics in different regions remain unclear, hindering our ability to evaluate its ecological effects. Therefore, we obtained monthly wet N deposition data from196 sites after continuous network observations and published data in China and analyzed the monthly dynamics of NH-N, NO-N, and dissolved inorganic N (DIN=NH-N+NO-N) deposition fluxes on site, regional, and national scales. We observed that the deposition fluxes of NH-N, NO-N, and DIN in China showed clear monthly patterns and regional differences. In Northern China, wet N deposition predominantly showed a unimodal trend, whereas in Southern China, it revealed a bimodal trend or irregular fluctuations. During 2000-2016, NH-N, NO-N, and DIN deposition fluxes were estimated as 9.09, 6.12, and 15.21 kg N ha year., respectively. Our findings enhance our understanding of atmospheric wet N deposition, and can serve as a reference for N deposition simulation experiments in different regions, and for generating long-term N deposition data for model optimization. Regional differences in the monthly dynamics of wet N deposition should be emphasized to accurately evaluate its ecological effects on terrestrial ecosystems in different regions.
中国是氮（N）沉积的全球三大热点地区之一，这引起了科学家和公众的关注。虽然之前关于中国 N 沉积的研究主要集中在其组成、空间格局和年际动态方面，但不同地区的月动态仍不清楚，这阻碍了我们评估其生态影响的能力。因此，我们从中国的 196 个站点获得了经过连续网络观测和发表的数据后，获得了每月湿 N 沉积数据，并分析了站点、区域和国家尺度上 NH-N、NO-N 和溶解无机 N（DIN=NH-N+NO-N）沉积通量的月动态。我们观察到，中国的 NH-N、NO-N 和 DIN 沉积通量表现出明显的月变化模式和区域差异。在中国北方，湿 N 沉积主要呈单峰趋势，而在中国南方，它呈双峰趋势或不规则波动。2000-2016 年期间，NH-N、NO-N 和 DIN 沉积通量分别估计为 9.09、6.12 和 15.21kgNha-year。我们的研究结果增强了我们对大气湿 N 沉积的理解，可为不同地区的 N 沉积模拟实验提供参考，并为模型优化生成长期 N 沉积数据。应该强调湿 N 沉积月动态的区域差异，以准确评估其对不同地区陆地生态系统的生态影响。
