globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016MS000817
Scopus记录号: 2-s2.0-85020418635
论文题名:
Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cycling
作者: Deng J; , McCalley C; K; , Frolking S; , Chanton J; , Crill P; , Varner R; , Tyson G; , Rich V; , Hines M; , Saleska S; R; , Li C
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期:2
起始页码: 1412
结束页码: 1430
语种: 英语
英文关键词: Biogeochemistry ; Climate change ; Dynamics ; Forecasting ; Metabolism ; Methane ; Microorganisms ; Sensitivity analysis ; Substrates ; Wetlands ; Biogeochemical models ; DNDC ; Fractionation factors ; Hydrogenotrophic methanogenesis ; Microbial communities ; Peat land ; Relative contribution ; Stable carbon isotopes ; Isotopes ; biogeochemistry ; carbon emission ; carbon isotope ; environmental change ; isotopic composition ; isotopic fractionation ; metabolism ; methane ; methanogenesis ; microbial activity ; microbial community ; oxidation ; peatland ; permafrost ; sensitivity analysis ; stable isotope ; Sweden
英文摘要: Climate change is expected to have significant and uncertain impacts on methane (CH4) emissions from northern peatlands. Biogeochemical models can extrapolate site-specificCH4 measurements to larger scales and predict responses of CH4 emissions to environmental changes. However, these models include considerable uncertainties and limitations in representing CH4 production, consumption, and transport processes. To improve predictions of CH4 transformations, we incorporated acetate and stable carbon (C) isotopic dynamics associated with CH4 cycling into a biogeochemistry model, DNDC. By including these new features, DNDC explicitly simulates acetate dynamics and the relative contribution of acetotrophic and hydrogenotrophic methanogenesis (AM and HM) to CH4 production, and predicts the C isotopic signature (δ13C) in soil C pools and emitted gases. When tested against biogeochemical and microbial community observations at two sites in a zone of thawing permafrost in a subarctic peatland in Sweden, the new formulation substantially improved agreement with CH4 production pathways and δ13C in emitted CH4 (δ13C-CH4), a measure of the integrated effects of microbial production and consumption, and of physical transport. We also investigated the sensitivity of simulated δ13C-CH4 to C isotopic composition of substrates and, to fractionation factors for CH4 production (αAM and αHM), CH4 oxidation (αMO), and plant-mediated CH4 transport (αTP). The sensitivity analysis indicated that the δ13C-CH4 is highly sensitive to the factors associated with microbial metabolism (αAM, αHM, and αMO). The model framework simulating stable C isotopic dynamics provides a robust basis for better constraining and testing microbial mechanisms in predicting CH4 cycling in peatlands. © 2017. The Authors.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75772
Appears in Collections:影响、适应和脆弱性
气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Earth Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, United States; Thomas H. Gosnell School of Life Sciences, Rochester Institute of Technology, One Lomb Memorial Drive, Rochester, NY, United States; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Department of Geological Sciences, Stockholm University, Stockholm, Sweden; Department of Earth Sciences, University of New Hampshire, Durham, NH, United States; Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD, Australia; Department of Microbiology, The Ohio State University, Columbus, OH, United States; Department of Biological Sciences, University of Massachusetts Lowell, Lowell, MA, United States; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States

Recommended Citation:
Deng J,, McCalley C,K,et al. Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cycling[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(2)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Deng J]'s Articles
[, McCalley C]'s Articles
[K]'s Articles
百度学术
Similar articles in Baidu Scholar
[Deng J]'s Articles
[, McCalley C]'s Articles
[K]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Deng J]‘s Articles
[, McCalley C]‘s Articles
[K]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.