Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13463 |
Ecosystem fluxes of hydrogen in a mid-latitude forest driven by soil microorganisms and plants | |
Meredith, Laura K.1,2; Commane, Roisin3; Keenan, Trevor F.4; Klosterman, Stephen T.5; Munger, J. William3; Templer, Pamela H.6; Tang, Jianwu7; Wofsy, Steven C.3; Prinn, Ronald G.2 | |
2017-02-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Molecular hydrogen (H-2) 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 H-2 in various ecosystems are sparse, resulting in large uncertainties in the global H-2 budget. Constraining the H-2 cycle is critical to understanding its role in atmospheric chemistry and climate. We measured H-2 fluxes at high frequency in a temperate mixed deciduous forest for 15months using a tower-based flux-gradient approach to determine both the soil-atmosphere and the net ecosystem flux of H-2. We found that Harvard Forest is a net H-2 sink (-1.4 +/- 1.1kg H(2)ha(-1)) with soils as the dominant H-2 sink (-2.0 +/- 1.0kg H(2)ha(-1)) and aboveground canopy emissions as the dominant H-2 source (+0.6 +/- 0.8kg H(2)ha(-1)). Aboveground emissions of H-2 were an unexpected and substantial component of the ecosystem H-2 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 H-2 uptake was correlated with rhizosphere respiration rates (r=0.8, P<0.001), and H-2 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 H-2 and raise new questions regarding the role of aboveground biomass as a source of atmospheric H-2 and mechanisms linking soil H-2 and carbon cycling. Results from this study should be incorporated into modeling efforts to predict the response of the H-2 soil sink to changes in anthropogenic H-2 emissions and shifting soil conditions with climate and land-use change. |
英文关键词 | atmosphere carbon cycle flux hydrogen microbe phenology snow soil |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394343300038 |
WOS关键词 | AFFINITY H-2-OXIDIZING BACTERIA ; ATMOSPHERIC MOLECULAR-HYDROGEN ; STREPTOMYCES SP PCB7 ; CARBON-MONOXIDE ; COMMUNITY COMPOSITION ; GLOBAL DISTRIBUTION ; NITROGEN-FIXATION ; DECIDUOUS FOREST ; TROPOSPHERIC H-2 ; HIGH-FREQUENCY |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
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/17395 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ 85721 USA; 2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA; 3.Harvard Univ, Dept Earth & Planetary Sci, Sch Engn & Appl Sci, 20 Oxford St, Cambridge, MA 02138 USA; 4.Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA USA; 5.Harvard Univ, Dept Organism & Evolutionary Biol, Cambridge, MA 02138 USA; 6.Boston Univ, Dept Biol, 5 Cummington St, Boston, MA 02215 USA; 7.Marine Biol Lab, Ctr Ecosyst, Woods Hole, MA 02543 USA |
推荐引用方式 GB/T 7714 | Meredith, Laura K.,Commane, Roisin,Keenan, Trevor F.,et al. Ecosystem fluxes of hydrogen in a mid-latitude forest driven by soil microorganisms and plants[J]. GLOBAL CHANGE BIOLOGY,2017,23(2). |
APA | Meredith, Laura K..,Commane, Roisin.,Keenan, Trevor F..,Klosterman, Stephen T..,Munger, J. William.,...&Prinn, Ronald G..(2017).Ecosystem fluxes of hydrogen in a mid-latitude forest driven by soil microorganisms and plants.GLOBAL CHANGE BIOLOGY,23(2). |
MLA | Meredith, Laura K.,et al."Ecosystem fluxes of hydrogen in a mid-latitude forest driven by soil microorganisms and plants".GLOBAL CHANGE BIOLOGY 23.2(2017). |
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