Forage conservation is a neglected nitrous oxide source

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青贮发酵被视为减少农业排放的新焦点

关键词：

来源：

PNAS Nexus

全文链接：

//agri.nais.net.cn/topic/downloadFile/2fc050f0-586c-497f-8a53-8651bb207268

来源地址：

https://academic.oup.com/pnasnexus/article/3/9/pgae373/7756552?login=true

资源所属：

马铃薯基因组设计育种

类型：

学术文献

语种：

英语

原文发布日期：

2024-09-24

摘要：

Agricultural activities are the major anthropogenic source of nitrous oxide (N2O), an important greenhouse gas and ozone-depleting substance. However, the role of forage conservation as a potential source of N2O has rarely been studied. We investigated N2O production from the simulated silage of the three major crops—maize, alfalfa, and sorghum—used for silage in the United States, which comprises over 90% of the total silage production. Our findings revealed that a substantial N2O could be generated, potentially placing forage conservation as the third largest N2O source in the agricultural sector. Notably, the application of chlorate as an additive significantly reduced N2O production, but neither acetylene nor intermittent exposure to oxygen showed any impact. Overall, the results highlight that denitrifiers, rather than nitrifiers, are responsible for N2O production from silage, which was confirmed by molecular analyses. Our study reveals a previously unexplored source of N2O and provides a crucial mechanistic understanding for effective mitigation strategies.