globalchange  > 气候减缓与适应
DOI: 10.1128/mBio.02521-18
WOS ID: WOS:000460314300049
Long-Term Warming in Alaska Enlarges the Diazotrophic Community in Deep Soils
Author: Feng, Jiajie1,2,3; Penton, C. Ryan4,5; He, Zhili1,2,3; Van Nostrand, Joy D.1,2,3; Yuan, Mengting M.1,2,3; Wu, Liyou1,2,3; Wang, Cong1,2,3; Qin, Yujia1,2,3; Shi, Zhou J.1,2,3; Guo, Xue1,2,3,6; Schuur, Edward A. G.7; Luo, Yiqi7; Bracho, Rosvel8; Konstantinidis, Konstantinos T.9,12; Cole, James R.10; Tiedje, James M.10; Yang, Yunfeng6; Zhou, Jizhong1,2,3,6,11
Corresponding Author: Yang, Yunfeng ; Zhou, Jizhong
Source Publication: MBIO
ISSN: 2150-7511
Publishing Year: 2019
Volume: 10, Issue:1
Language: 英语
Keyword: climate warming ; diazotrophs ; gene sequencing ; soil microbiology ; tundra
WOS Category: Microbiology
WOS Research Area: Microbiology
English Abstract:

Tundra ecosystems are typically carbon (C) rich but nitrogen (N) limited. Since biological N-2 fixation is the major source of biologically available N, the soil N-2-fixing (i.e., diazotrophic) community serves as an essential N supplier to the tundra ecosystem. Recent climate warming has induced deeper permafrost thaw and adversely affected C sequestration, which is modulated by N availability. Therefore, it is crucial to examine the responses of diazotrophic communities to warming across the depths of tundra soils. Herein, we carried out one of the deepest sequencing efforts of nitrogenase gene (nifH) to investigate how 5 years of experimental winter warming affects Alaskan soil diazotrophic community composition and abundance spanning both the organic and mineral layers. Although soil depth had a stronger influence on diazotrophic community composition than warming, warming significantly (P < 0.05) enhanced diazotrophic abundance by 86.3% and aboveground plant biomass by 25.2%. Diazotrophic composition in the middle and lower organic layers, detected by nifH sequencing and a microarray-based tool (GeoChip), was markedly altered, with an increase of alpha-diversity. Changes in diazotrophic abundance and composition significantly correlated with soil moisture, soil thaw duration, and plant biomass, as shown by structural equation modeling analyses. Therefore, more abundant diazotrophic communities induced by warming may potentially serve as an important mechanism for supplementing biologically available N in this tundra ecosystem.

IMPORTANCE With the likelihood that changes in global climate will adversely affect the soil C reservoir in the northern circumpolar permafrost zone, an understanding of the potential role of diazotrophic communities in enhancing biological N-2 fixation, which constrains both plant production and microbial decomposition in tundra soils, is important in elucidating the responses of soil microbial communities to global climate change. A recent study showed that the composition of the diazotrophic community in a tundra soil exhibited no change under a short-term (1.5-year) winter warming experiment. However, it remains crucial to examine whether the lack of diazotrophic community responses to warming is persistent over a longer time period as a possibly important mechanism in stabilizing tundra soil C. Through a detailed characterization of the effects of winter warming on diazotrophic communities, we showed that a long-term (5-year) winter warming substantially enhanced diazotrophic abundance and altered community composition, though soil depth had a stronger influence on diazotrophic community composition than warming. These changes were best explained by changes in soil moisture, soil thaw duration, and plant biomass. These results provide crucial insights into the potential factors that may impact future C and N availability in tundra regions.

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Document Type: 期刊论文
Appears in Collections:气候减缓与适应

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Affiliation: 1.Univ Oklahoma, Inst Environm Genom, Norman, OK 73019 USA
2.Univ Oklahoma, Dept Microbiol & Plant Biol, Norman, OK 73019 USA
3.Univ Oklahoma, Sch Civil Engn & Environm Sci, Norman, OK 73019 USA
4.Arizona State Univ, Coll Integrat Sci & Arts, Mesa, AZ USA
5.Arizona State Univ, Biodesign Inst, Ctr Fundamental & Appl Microbiom, Tempe, AZ USA
6.Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing, Peoples R China
7.No Arizona Univ, Ctr Ecosyst Sci & Soc, Flagstaff, AZ 86011 USA
8.Univ Florida, Dept Biol, Sch Forest Resources & Conservat, Gainesville, FL USA
9.Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA
10.Michigan State Univ, Ctr Microbial Ecol, E Lansing, MI 48824 USA
11.Lawrence Berkeley Natl Lab, Earth & Environm Sci, Berkeley, CA 94720 USA
12.Georgia Inst Technol, Sch Biol, Ctr Bioinformat & Computat Genom, Atlanta, GA 30332 USA

Recommended Citation:
Feng, Jiajie,Penton, C. Ryan,He, Zhili,et al. Long-Term Warming in Alaska Enlarges the Diazotrophic Community in Deep Soils[J]. MBIO,2019-01-01,10(1)
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