QUEST, Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK.
Environ Pollut. 2011 Oct;159(10):2214-22. doi: 10.1016/j.envpol.2010.11.014. Epub 2010 Dec 4.
The organic component of atmospheric reactive nitrogen plays a role in biogeochemical cycles, climate and ecosystems. Although its deposition has long been known to be quantitatively significant, it is not routinely assessed in deposition studies and monitoring programmes. Excluding this fraction, typically 25-35%, introduces significant uncertainty in the determination of nitrogen deposition, with implications for the critical loads approach. The last decade of rainwater studies substantially expands the worldwide dataset, giving enough global coverage for specific hypotheses to be considered about the distribution, composition, sources and effects of organic-nitrogen deposition. This data collation and meta-analysis highlights knowledge gaps, suggesting where data-gathering efforts and process studies should be focused. New analytical techniques allow long-standing conjectures about the nature and sources of organic N to be investigated, with tantalising indications of the interplay between natural and anthropogenic sources, and between the nitrogen and carbon cycles.
大气活性氮的有机成分在生物地球化学循环、气候和生态系统中发挥着作用。尽管其沉降长期以来被认为具有重要的定量意义，但在沉降研究和监测计划中并未对其进行常规评估。不包括这一部分（通常为 25-35%），会导致氮沉降的测定存在显著的不确定性，这对临界负荷方法产生影响。过去十年的雨水研究极大地扩展了全球数据集，为特定假设提供了足够的全球覆盖范围，以考虑有机氮沉降的分布、组成、来源和影响。这项数据整理和荟萃分析突出了知识空白，表明应该在哪里集中精力收集数据和进行过程研究。新的分析技术允许对有机氮的性质和来源进行长期推测，并提供了有关自然和人为来源之间以及氮循环和碳循环之间相互作用的诱人迹象。
