globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13463
论文题名:
Ecosystem fluxes of hydrogen in a mid-latitude forest driven by soil microorganisms and plants
作者: Meredith L.K.; Commane R.; Keenan T.F.; Klosterman S.T.; Munger J.W.; Templer P.H.; Tang J.; Wofsy S.C.; Prinn R.G.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期:2
起始页码: 906
结束页码: 919
语种: 英语
英文关键词: atmosphere ; carbon cycle ; flux ; hydrogen ; microbe ; phenology ; snow ; soil
英文摘要: Molecular hydrogen (H2) is an atmospheric trace gas with a large microbe-mediated soil sink, yet cycling of this compound throughout ecosystems is poorly understood. Measurements of the sources and sinks of H2 in various ecosystems are sparse, resulting in large uncertainties in the global H2 budget. Constraining the H2 cycle is critical to understanding its role in atmospheric chemistry and climate. We measured H2 fluxes at high frequency in a temperate mixed deciduous forest for 15 months using a tower-based flux-gradient approach to determine both the soil-atmosphere and the net ecosystem flux of H2. We found that Harvard Forest is a net H2 sink (−1.4 ± 1.1 kg H2 ha−1) with soils as the dominant H2 sink (−2.0 ± 1.0 kg H2 ha−1) and aboveground canopy emissions as the dominant H2 source (+0.6 ± 0.8 kg H2 ha−1). Aboveground emissions of H2 were an unexpected and substantial component of the ecosystem H2 flux, reducing net ecosystem uptake by 30% of that calculated from soil uptake alone. Soil uptake was highly seasonal (July maximum, February minimum), positively correlated with soil temperature and negatively correlated with environmental variables relevant to diffusion into soils (i.e., soil moisture, snow depth, snow density). Soil microbial H2 uptake was correlated with rhizosphere respiration rates (r = 0.8, P < 0.001), and H2 metabolism yielded up to 2% of the energy gleaned by microbes from carbon substrate respiration. Here, we elucidate key processes controlling the biosphere–atmosphere exchange of H2 and raise new questions regarding the role of aboveground biomass as a source of atmospheric H2 and mechanisms linking soil H2 and carbon cycling. Results from this study should be incorporated into modeling efforts to predict the response of the H2 soil sink to changes in anthropogenic H2 emissions and shifting soil conditions with climate and land-use change. © 2016 John Wiley & Sons Ltd
资助项目: Meredith, L.K. ; Department of Ecology and Evolutionary Biology, University of ArizonaUnited States ; 电子邮件: laurameredith@email.arizona.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61085
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States; Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Earth and Planetary Science, School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States; Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, United States; Department of Biology, Boston University, Boston, MA, United States; Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, United States

Recommended Citation:
Meredith L.K.,Commane R.,Keenan T.F.,et al. Ecosystem fluxes of hydrogen in a mid-latitude forest driven by soil microorganisms and plants[J]. Global Change Biology,2017-01-01,23(2)
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