气候变化领域集成服务门户(CCPortal): Clumped Isotopes Link Older Carbon Substrates With Slower Rates of Methanogenesis in Northern Lakes

CCPortal

DOI	10.1029/2019GL086756
	Clumped Isotopes Link Older Carbon Substrates With Slower Rates of Methanogenesis in Northern Lakes
	Douglas P.M.J.; Gonzalez Moguel R.; Walter Anthony K.M.; Wik M.; Crill P.M.; Dawson K.S.; Smith D.A.; Yanay E.; Lloyd M.K.; Stolper D.A.; Eiler J.M.; Sessions A.L.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:6
英文摘要	The release of long-stored carbon from thawed permafrost could fuel increased methanogenesis in northern lakes, but it remains unclear whether old carbon substrates released from permafrost are metabolized as rapidly by methanogenic microbial communities as recently produced organic carbon. Here, we apply methane (CH4) clumped isotope (Δ18) and 14C measurements to test whether rates of methanogenesis are related to carbon substrate age. Results from culture experiments indicate that Δ18 values are negatively correlated with CH4 production rate. Measurements of ebullition samples from thermokarst lakes in Alaska and glacial lakes in Sweden indicate strong negative correlations between CH4 Δ18 and the fraction modern carbon. These correlations imply that CH4 derived from older carbon substrates is produced relatively slowly. Relative rates of methanogenesis, as inferred from Δ18 values, are not positively correlated with CH4 flux estimates, highlighting the likely importance of environmental variables other than CH4 production rates in controlling ebullition fluxes. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Isotopes; Lakes; Methane; Permafrost; Substrates; Carbon substrates; Clumped isotopes; Environmental variables; Microbial communities; Negative correlation; Production rates; radiocarbon; Thermokarst lakes; Organic carbon; carbon isotope; environmental factor; methane; methanogenesis; microbial community; organic carbon; permafrost; radiocarbon dating; thermokarst; Alaska; Sweden; United States
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170533
作者单位	Department of Earth and Planetary Sciences, McGill University, Montreal, QC, Canada; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; International Arctic Research Center, University of Alaska-Fairbanks, Fairbanks, AK, United States; Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Department of Environmental Sciences, Rutgers University, New Brunswick, NJ, United States; Department of Biology, Case Western Reserve University, Cleveland, OH, United States; Department of Genetics, Institute of Life Sciences, Hebrew University of Jerusalem, Israel; Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Douglas P.M.J.,Gonzalez Moguel R.,Walter Anthony K.M.,et al. Clumped Isotopes Link Older Carbon Substrates With Slower Rates of Methanogenesis in Northern Lakes[J],2020,47(6).
APA	Douglas P.M.J..,Gonzalez Moguel R..,Walter Anthony K.M..,Wik M..,Crill P.M..,...&Sessions A.L..(2020).Clumped Isotopes Link Older Carbon Substrates With Slower Rates of Methanogenesis in Northern Lakes.Geophysical Research Letters,47(6).
MLA	Douglas P.M.J.,et al."Clumped Isotopes Link Older Carbon Substrates With Slower Rates of Methanogenesis in Northern Lakes".Geophysical Research Letters 47.6(2020).