Revisiting enteric methane emissions from domestic ruminants and their δ13CCH4 source signature
Revisiting enteric methane emissions from domestic ruminants and their δ13CCH4 source signature
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DOI：
10.1038/s41467-019-11066-3
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发表时间：
2019-07-31
影响因子：
16.6
通讯作者：
Bousquet, Philippe
中科院分区：
文献类型：
--
作者：
Chang, Jinfeng;Peng, Shushi;Bousquet, Philippe
准确了解每种来源甲烷的C-13同位素特征（Δ C-13）对于在自下而上和自上而下的甲烷预算中分离生物源、化石燃料和热解排放至关重要。畜牧业生产是全球甲烷预算中最大的人为来源，主要来自国内反刍动物的肠道发酵。然而，全球平均水平，地理分布和时间变化的Δ C-13肠道排放还没有得到很好的理解。在这里，我们提供了一个新的估计国内反刍动物（牛，水牛，山羊和绵羊）的C3-C4饮食组成，修订估计每年肠道CH 4排放量，并在1961年至2012年期间，其三角洲C-13的演变的新估计。与以前的估计相比，我们的研究结果表明，反刍动物的肠道排放对2000年至2012年全球甲烷排放量增加趋势的贡献较大，对大气甲烷Δ C-13的减少也有较大贡献。
Accurate knowledge of C-13 isotopic signature (delta C-13) of methane from each source is crucial for separating biogenic, fossil fuel and pyrogenic emissions in bottom-up and top-down methane budget. Livestock production is the largest anthropogenic source in the global methane budget, mostly from enteric fermentation of domestic ruminants. However, the global average, geographical distribution and temporal variations of the delta C-13 of enteric emissions are not well understood yet. Here, we provide a new estimation of C3-C4 diet composition of domestic ruminants (cattle, buffaloes, goats and sheep), a revised estimation of yearly enteric CH4 emissions, and a new estimation for the evolution of its delta C-13 during the period 1961-2012. Compared to previous estimates, our results suggest a larger contribution of ruminants' enteric emissions to the increasing trend in global methane emissions between 2000 and 2012, and also a larger contribution to the observed decrease in the delta C-13 of atmospheric methane.