气候变化领域集成服务门户(CCPortal): Stable carbon isotope biogeochemistry of propionate and acetate in methanogenic soils and lake sediments

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DOI	10.1016/j.orggeochem.2014.03.010
	Stable carbon isotope biogeochemistry of propionate and acetate in methanogenic soils and lake sediments
	Conrad, R.; Claus, P.; Chidthaisong, A.; Lu, Y.; Scavino, A. Fernandez; Liu, Y.; Angel, R.; Galand, P. E.; Casper, P.; Guerin, F.; Enrich-Prast, A.
通讯作者	Conrad, R (通讯作者)
发表日期	2014
ISSN	0146-6380
起始页码	1
结束页码	7
卷号	73
英文摘要	In anoxic environments, degradation of organic matter (OM) results in strong fractionation of carbon isotopes, with formation of C-13-depleted CH4. Propionate and acetate are important products of OM fermentation. Propionate is further fermented to acetate. Acetate is a direct precursor of CH4, the remainder usually being produced from H-2-mediated CO2 reduction. There is a paucity of data for the turnover of acetate and, even more so, propionate. We therefore analyzed the d 13C values of organic carbon, propionate, acetate and the methyl (Me) group of acetate (acetate-Me) during the production of CH4 in anoxic incubations of various flooded and non-flooded soils and various lake sediments. Incubation in the presence of CH3F, which inhibits CH4 production from acetate, allowed exclusion of isotope effects during aceticlastic methanogenesis. Despite the variation inherent in the wide diversity of sample type and origin, the data collectively showed that the d C-13 value of acetate was only marginally different (-2 +/- 5%) from that of OM, while propionate was depleted in C-13 relative to total acetate (-6 +/- 5 parts per thousand). Acetate-Me was generally depleted in C-13 relative to total acetate (- 8 +/- 5%). Thus, isotopic enrichment factors during the degradation of OM to total propionate and acetate were much smaller than those during hydrogenotrophic and aceticlastic methanogenesis or the intramolecular difference in d 13C between the carboxyl (CO2H) and Me of acetate, so that the d C-13 value of OM may be used as a proxy when data for acetate are not available. (C) 2014 Elsevier Ltd. All rights reserved.
关键词	ARCHAEAL COMMUNITY COMPOSITION METHANE PRODUCTION ACETOCLASTIC METHANOGENESIS METHYL-FLUORIDE ORGANIC-MATTER FRACTIONATION DEGRADATION FERMENTATION OXIDATION PATHWAY
英文关键词	Acetate; Propionate; Methane; Organic matter; Fermentation; Isotope fractionation; Anoxic soil; Lake sediment
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000338967500001
来源期刊	ORGANIC GEOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258412
推荐引用方式 GB/T 7714	Conrad, R.,Claus, P.,Chidthaisong, A.,et al. Stable carbon isotope biogeochemistry of propionate and acetate in methanogenic soils and lake sediments[J]. 中国科学院青藏高原研究所,2014,73.
APA	Conrad, R..,Claus, P..,Chidthaisong, A..,Lu, Y..,Scavino, A. Fernandez.,...&Enrich-Prast, A..(2014).Stable carbon isotope biogeochemistry of propionate and acetate in methanogenic soils and lake sediments.ORGANIC GEOCHEMISTRY,73.
MLA	Conrad, R.,et al."Stable carbon isotope biogeochemistry of propionate and acetate in methanogenic soils and lake sediments".ORGANIC GEOCHEMISTRY 73(2014).