Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/NGEO2940 |
Thermodynamically controlled preservation of organic carbon in floodplains | |
Boye, Kristin1,2; Noel, Vincent1; Tfaily, Malak M.3; Bone, Sharon E.1; Williams, Kenneth H.4; Bargar, John R.1; Fendorf, Scott2 | |
2017-06-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Organic matter decomposition in soils and terrestrial sediments has a prominent role in the global carbon cycle. Carbon stocks in anoxic environments, such as wetlands and the subsurface of floodplains, are large and presumed to decompose slowly. The degree of microbial respiration in anoxic environments is typically thought to depend on the energetics of available terminal electron acceptors such as nitrate or sulfate; microbes couple the reduction of these compounds to the oxidation of organic carbon. However, it is also possible that the energetics of the organic carbon itself can determine whether it is decomposed. Here we examined water-soluble organic carbon by Fourier-transform ion-cyclotron-resonance mass spectrometry to compare the chemical composition and average nominal oxidation state of carbon-a metric reflecting whether microbial oxidation of organic matter is thermodynamically favourable-in anoxic (sulfidic) and oxic (non-sulfidic) floodplain sediments. We observed distinct minima in the average nominal oxidation state of water-soluble carbon in sediments exhibiting anoxic, sulfate-reducing conditions, suggesting preservation of carbon compounds with nominal oxidation states below the threshold that makes microbial sulfate reduction thermodynamically favourable. We conclude that thermodynamic limitations constitute an important complement to other mechanisms of carbon preservation, such as enzymatic restrictions and mineral association, within anaerobic environments. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000402579200009 |
WOS关键词 | K-EDGE XANES ; NEXAFS SPECTROSCOPY ; MASS-SPECTRA ; MATTER ; SOIL ; SEDIMENTS ; SPECIATION ; CHEMISTRY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34691 |
专题 | 地球科学 气候变化 |
作者单位 | 1.SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA; 2.Stanford Univ, Earth Syst Sci Dept, Stanford, CA 94305 USA; 3.Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richmond, WA 99354 USA; 4.Lawrence Berkeley Natl Lab, Climate & Ecosyst Sci Div, Berkeley, CA 94720 USA |
推荐引用方式 GB/T 7714 | Boye, Kristin,Noel, Vincent,Tfaily, Malak M.,et al. Thermodynamically controlled preservation of organic carbon in floodplains[J]. NATURE GEOSCIENCE,2017,10(6). |
APA | Boye, Kristin.,Noel, Vincent.,Tfaily, Malak M..,Bone, Sharon E..,Williams, Kenneth H..,...&Fendorf, Scott.(2017).Thermodynamically controlled preservation of organic carbon in floodplains.NATURE GEOSCIENCE,10(6). |
MLA | Boye, Kristin,et al."Thermodynamically controlled preservation of organic carbon in floodplains".NATURE GEOSCIENCE 10.6(2017). |
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