Shuo Wang, Wei Zhi, Shengjie Li, Tao Lyu, Guodong Ji
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引用次数: 0
摘要
假定河流N2O通量随硝酸盐负荷线性增加。然而,这种与均匀EF5r的线性关系受到的约束很差,这阻碍了N2O的估计和减缓。我们的荟萃分析发现,天然河流具有普遍的N2O排放基线(EF5r = k/[NO3 -], k = 0.02)。人为影响导致基线的总体增加和热点的出现,构成了两种典型的人为源模式。农业河流和城市河流的k值分别增加到0.09和0.05,分别有11%和14%的点成为N2O热点。重点控制有机污染和NH4 +污染可消除热点地区,减排效果分别为51.6%和63.7%。考虑到人口增长和单位效益下降,进一步恢复硝酸盐去除的基线排放是一项长期挑战(ΔN-N2O/N-NO3 -)。EF线的发现强调了瞄准热点和可持续管理基线排放以平衡社会和环境效益的重要性。
Sustainable management of riverine N2O emission baselines.
The riverine N2O fluxes are assumed to linearly increase with nitrate loading. However, this linear relationship with a uniform EF5r is poorly constrained, which impedes the N2O estimation and mitigation. Our meta-analysis discovered a universal N2O emission baseline (EF5r = k/[NO3-], k = 0.02) for natural rivers. Anthropogenic impacts caused an overall increase in baselines and the emergence of hotspots, which constitute two typical patterns of anthropogenic sources. The k values of agricultural and urban rivers increased to 0.09 and 0.05, respectively, with 11% and 14% of points becoming N2O hotspots. Priority control of organic and NH4+ pollution could eliminate hotspots and reduce emissions by 51.6% and 63.7%, respectively. Further restoration of baseline emissions on nitrate removal is a long-term challenge considering population growth and declining unit benefits (ΔN-N2O/N-NO3-). The discovery of EF lines emphasized the importance of targeting hotspots and managing baseline emissions sustainably to balance social and environmental benefits.
期刊介绍:
National Science Review (NSR; ISSN abbreviation: Natl. Sci. Rev.) is an English-language peer-reviewed multidisciplinary open-access scientific journal published by Oxford University Press under the auspices of the Chinese Academy of Sciences.According to Journal Citation Reports, its 2021 impact factor was 23.178.
National Science Review publishes both review articles and perspectives as well as original research in the form of brief communications and research articles.