globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.14316
Scopus记录号: 2-s2.0-85047829376
论文题名:
Temperature response of permafrost soil carbon is attenuated by mineral protection
作者: Gentsch N.; Wild B.; Mikutta R.; Čapek P.; Diáková K.; Schrumpf M.; Turner S.; Minnich C.; Schaarschmidt F.; Shibistova O.; Schnecker J.; Urich T.; Gittel A.; Šantrůčková H.; Bárta J.; Lashchinskiy N.; Fuß R.; Richter A.; Guggenberger G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期:8
起始页码: 3401
结束页码: 3415
语种: 英语
英文关键词: carbon mineralization ; incubation ; mineral-organic association ; permafrost soils ; radiocarbon ; temperature sensitivity
Scopus关键词: climate change ; fractionation ; incubation ; mineralization ; permafrost ; radiocarbon dating ; sensitivity analysis ; soil carbon ; temperature effect ; Siberia
英文摘要: Climate change in Arctic ecosystems fosters permafrost thaw and makes massive amounts of ancient soil organic carbon (OC) available to microbial breakdown. However, fractions of the organic matter (OM) may be protected from rapid decomposition by their association with minerals. Little is known about the effects of mineral-organic associations (MOA) on the microbial accessibility of OM in permafrost soils and it is not clear which factors control its temperature sensitivity. In order to investigate if and how permafrost soil OC turnover is affected by mineral controls, the heavy fraction (HF) representing mostly MOA was obtained by density fractionation from 27 permafrost soil profiles of the Siberian Arctic. In parallel laboratory incubations, the unfractionated soils (bulk) and their HF were comparatively incubated for 175 days at 5 and 15°C. The HF was equivalent to 70 ± 9% of the bulk CO2 respiration as compared to a share of 63 ± 1% of bulk OC that was stored in the HF. Significant reduction of OC mineralization was found in all treatments with increasing OC content of the HF (HF-OC), clay-size minerals and Fe or Al oxyhydroxides. Temperature sensitivity (Q10) decreased with increasing soil depth from 2.4 to 1.4 in the bulk soil and from 2.9 to 1.5 in the HF. A concurrent increase in the metal-to-HF-OC ratios with soil depth suggests a stronger bonding of OM to minerals in the subsoil. There, the younger 14C signature in CO2 than that of the OC indicates a preferential decomposition of the more recent OM and the existence of a MOA fraction with limited access of OM to decomposers. These results indicate strong mineral controls on the decomposability of OM after permafrost thaw and on its temperature sensitivity. Thus, we here provide evidence that OM temperature sensitivity can be attenuated by MOA in permafrost soils. © 2018 John Wiley & Sons Ltd
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被引频次[WOS]:76   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110326
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Institute of Soil Science, Leibniz Universität Hannover, Hannover, Germany; Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria; Austrian Polar Research Institute, Vienna, Austria; Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Soil Science and Soil Protection, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany; Department of Ecosystems Biology, University of South Bohemia, České Budéjovice, Czech Republic; Max Planck Institute for Biogeochemistry, Jena, Germany; Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany; Soil Ecology, University of Bayreuth, Bayreuth, Germany; Institute of Biostatistics, Leibniz Universität Hannover, Hannover, Germany; V.N. Sukachev Institute of Forest, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russian Federation; Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, United States; Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria; Institute of Microbiology, Ernst-Moritz-Arndt University, Greifswald, Germany; Department of Biology, Centre for Geobiology, University of Bergen, Bergen, Norway; Department of Bioscience, Centre for Geomicrobiology, Aarhus, Denmark; Central Siberian Botanical Garden, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation; Thünen Institute of Climate-Smart Agriculture, Braunschweig, Germany

Recommended Citation:
Gentsch N.,Wild B.,Mikutta R.,et al. Temperature response of permafrost soil carbon is attenuated by mineral protection[J]. Global Change Biology,2018-01-01,24(8)
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