气候变化领域集成服务门户(CCPortal): Radiocarbon analysis reveals that vegetation facilitates the release of old methane in a temperate raised bog

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DOI	10.1007/s10533-020-00638-x
	Radiocarbon analysis reveals that vegetation facilitates the release of old methane in a temperate raised bog
	Garnett M.H.; Hardie S.M.L.; Murray C.
发表日期	2020
ISSN	1682563
英文摘要	Peatlands have accumulated vast quantities of organic carbon over thousands of years but it is unclear how these sensitive ecosystems will respond to future climate change. If emissions of methane from peatlands increase, then they may contribute increasingly towards climatic warming due to the higher greenhouse warming potential of this gas. We investigated the radiocarbon concentration of methane emissions from a temperate bog over 1.5 years, which we supported with measurements of the surface flux of methane and carbon dioxide. The radiocarbon content of methane emissions varied greatly, from modern (i.e. fixed from the atmosphere within recent decades) to ~ 1400 years BP. Flux rates of methane were spatially and temporally highly variable. A vegetation clipping experiment showed that plants had a great influence on the carbon isotope composition and flux of methane emitted from the peat surface, consistent with earlier studies showing the key role of plants in peatland methane emissions. When plants were absent, emission rates were 70–94% lower and the radiocarbon age of methane emissions was much younger and less variable. Our radiocarbon measurements show that at this peatland, plant-associated methane emissions contain carbon originally fixed from the atmosphere up to hundreds of years earlier, consistent with a contribution from plant mediated transport of methane sourced from sub-surface layers. © 2020, The Author(s).
英文关键词	Carbon dioxide; Climate change; Methane; Peatland; Radiocarbon; Vegetation
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120386
作者单位	NERC Radiocarbon Facility, East Kilbride, G75 0QF, United Kingdom; CSD Ingenieure AG, Schachenallee 29A, Aarau, 5000, Switzerland
推荐引用方式 GB/T 7714	Garnett M.H.,Hardie S.M.L.,Murray C.. Radiocarbon analysis reveals that vegetation facilitates the release of old methane in a temperate raised bog[J],2020.
APA	Garnett M.H.,Hardie S.M.L.,&Murray C..(2020).Radiocarbon analysis reveals that vegetation facilitates the release of old methane in a temperate raised bog.Biogeochemistry.
MLA	Garnett M.H.,et al."Radiocarbon analysis reveals that vegetation facilitates the release of old methane in a temperate raised bog".Biogeochemistry (2020).