Carbon isotopic signature reveals the geographical trend in methane consumption and production pathways in alpine ecosystems over the Qinghai-Tibetan Plateau

On the Qinghai-Tibetan Plateau, isotopic signatures in soil-atmosphere CH 4 fluxes were investigated in nine grasslands and three wetlands. In the grasslands, the fractionation factor for soil CH 4 uptake, α soil , was much smaller than the usually reported value of 0.9975-1.0095. Stepwise multiple...

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Bibliographic Details
Published in:	Isotopes in environmental and health studies Vol. 53; no. 6; pp. 597 - 609
Main Authors:	Kato, Tomomichi, Yamada, Keita, Tang, Yanhong, Yoshida, Naohiro, Wada, Eitaro
Format:	Journal Article
Language:	English
Published:	England Taylor & Francis 01-12-2017 Taylor & Francis Ltd
Subjects:	Alpine environments Altitude Atmosphere - chemistry Bogs Carbon Isotopes - analysis Carbon Isotopes - chemistry Carbon-13 Carbon/nitrogen ratio Environmental factors Environmental Monitoring Fluxes Fractionation Grassland Grasslands isotope ecology isotope fractionation Isotopes Methane Methane - metabolism methane oxidation methane production Moisture content Oxidation Oxidation-reduction potential Qinghai-Tibetan Plateau Redox potential Redox reactions Soil - chemistry soil C/N Soil investigations Soil water Tibet wetland Wetlands Tibetan Plateau methane production Qinghai–Tibetan Plateau wetland isotope fractionation isotope ecology soil C/N Carbon-13 grassland methane oxidation
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Summary:	On the Qinghai-Tibetan Plateau, isotopic signatures in soil-atmosphere CH 4 fluxes were investigated in nine grasslands and three wetlands. In the grasslands, the fractionation factor for soil CH 4 uptake, α soil , was much smaller than the usually reported value of 0.9975-1.0095. Stepwise multiple variation analysis indicates that α soil is higher for higher soil water contents but is lower for higher C/N ratios of soil surface biomass. In the three wetlands, the soil-emitted δ 13 C-CH 4 was similar (−55.3 ± 5.5 ‰ and −53.0 ± 5.5 ‰) in two bogs separated by >1000 km but was lower (−63.4 ± 6.3 ‰) in a marsh. Environmental factors related to intrasite variations in soil-emitted δ 13 C-CH 4 include the soil C/N ratio, oxidation-reduction potential, soil C concentration and soil water contents. Geographical isotopic surveys revealed environmental constraints on the CH 4 consumption pathways in grasslands and the biome type-specific consistency in CH 4 production pathways in wetlands.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1025-6016 1477-2639
DOI:	10.1080/10256016.2017.1326916