globalchange  > 全球变化的国际研究计划
DOI: 10.1073/pnas.1901307116
WOS ID: WOS:000476715500051
Title:
Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths
Author: Johnston, Eric R.1,2; Hatt, Janet K.1; He, Zhili3,4; Wu, Liyou3,4; Guo, Xue5; Luo, Yiqi3,6; Schuur, Edward A. G.6; Tiedje, James M.7; Zhou, Jizhong3,4,5,8; Konstantinidis, Konstantinos T.1,9
Corresponding Author: Konstantinidis, Konstantinos T.
Source Publication: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN: 0027-8424
Publishing Year: 2019
Volume: 116, Issue:30, Pages:15096-15105
Language: 英语
Keyword: tundra ; metagenomics ; permafrost ; climate change ; soil microbiology
WOS Keyword: PERMAFROST CARBON ; METHANE EMISSIONS ; READ ALIGNMENT ; CLIMATE-CHANGE ; VULNERABILITY ; THERMOKARST ; DYNAMICS ; NITROGEN ; REVEALS ; RELEASE
WOS Category: Multidisciplinary Sciences
WOS Research Area: Science & Technology - Other Topics
English Abstract:

Northern-latitude tundra soils harbor substantial carbon (C) stocks that are highly susceptible to microbial degradation with rising global temperatures. Understanding the magnitude and direction (e.g., C release or sequestration) of the microbial responses to warming is necessary to accurately model climate change. In this study, Alaskan tundra soils were subjected to experimental in situ warming by similar to 1.1 degrees C above ambient temperature, and the microbial communities were evaluated using metagenomics after 4.5 years, at 2 depths: 15 to 25 cm (active layer at outset of the experiment) and 45 to 55 cm (transition zone at the permafrost/active layer boundary at the outset of the experiment). In contrast to small or insignificant shifts after 1.5 years of warming, 4.5 years of warming resulted in significant changes to the abundances of functional traits and the corresponding taxa relative to control plots (no warming), and microbial shifts differed qualitatively between the two soil depths. At 15 to 25 cm, increased abundances of carbohydrate utilization genes were observed that correlated with (increased) measured ecosystem carbon respiration. At the 45- to 55-cm layer, increased methanogenesis potential was observed, which corresponded with a 3-fold increase in abundance of a single archaeal Glade of the Methanosarcinales order, increased annual thaw duration (45.3 vs. 79.3 days), and increased CH4 emissions. Collectively, these data demonstrate that the microbial responses to warming in tundra soil are rapid and markedly different between the 2 critical soil layers evaluated, and identify potential biomarkers for the corresponding microbial processes that could be important in modeling.


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被引频次[WOS]:7   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/143681
Appears in Collections:全球变化的国际研究计划

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Affiliation: 1.Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA
2.Oak Ridge Natl Lab, Biosci Div, Oak Ridge, TN 37830 USA
3.Univ Oklahoma, Inst Environm Genom, Norman, OK 73019 USA
4.Univ Oklahoma, Dept Microbiol & Plant Biol, Norman, OK 73019 USA
5.Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100091, Peoples R China
6.No Arizona Univ, Dept Biol Sci, Box 5640, Flagstaff, AZ 86011 USA
7.Michigan State Univ, Ctr Microbial Ecol, E Lansing, MI 48824 USA
8.Lawrence Berkeley Natl Lab, Earth Sci Div, Berkeley, CA 94720 USA
9.Georgia Inst Technol, Sch Biol Sci, Atlanta, GA 30332 USA

Recommended Citation:
Johnston, Eric R.,Hatt, Janet K.,He, Zhili,et al. Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019-01-01,116(30):15096-15105
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