Li Ya, Tian Hanqin, Yao Yuanzhi, Shi Hao, Bian Zihao, Shi Yu, Wang Siyuan, Maavara Taylor, Lauerwald Ronny, Pan Shufen
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
International Center for Climate and Global Change Research, Auburn University, Auburn, AL, 36849, USA.
Nat Commun. 2024 Jan 31;15(1):942. doi: 10.1038/s41467-024-45061-0.
Lentic systems (lakes and reservoirs) are emission hotpots of nitrous oxide (NO), a potent greenhouse gas; however, this has not been well quantified yet. Here we examine how multiple environmental forcings have affected NO emissions from global lentic systems since the pre-industrial period. Our results show that global lentic systems emitted 64.6 ± 12.1 Gg NO-N yr in the 2010s, increased by 126% since the 1850s. The significance of small lentic systems on mitigating NO emissions is highlighted due to their substantial emission rates and response to terrestrial environmental changes. Incorporated with riverine emissions, this study indicates that NO emissions from global inland waters in the 2010s was 319.6 ± 58.2 Gg N yr. This suggests a global emission factor of 0.051% for inland water NO emissions relative to agricultural nitrogen applications and provides the country-level emission factors (ranging from 0 to 0.341%) for improving the methodology for national greenhouse gas emission inventories.
静水系统（湖泊和水库）是一氧化二氮（N₂O，一种强效温室气体）的排放热点；然而，这一点尚未得到很好的量化。在此，我们研究了自工业化前时期以来，多种环境因素如何影响全球静水系统的N₂O排放。我们的结果表明，全球静水系统在2010年代排放了64.6±12.1Gg N₂O-N/年，自1850年代以来增加了126%。小型静水系统因其可观的排放速率以及对陆地环境变化的响应，在减排N₂O方面的重要性得以凸显。结合河流排放，本研究表明，2010年代全球内陆水体的N₂O排放为319.6±58.2Gg N/年。这表明内陆水体N₂O排放相对于农业氮施用的全球排放因子为0.051%，并提供了国家层面的排放因子（范围从0到0.341%），以改进国家温室气体排放清单的编制方法。
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