Microbial Community and Functional Gene Changes in Arctic Tundra Soils in a Microcosm Warming Experiment
Microbial decomposition of soil organic carbon (SOC) in thawing Arctic permafrost is important in determining greenhouse gas feedbacks of tundra ecosystems to climate. However, the changes in microbial community structure during SOC decomposition are poorly known. Here we examine these changes using...
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ftcdlib:oai:escholarship.org:ark:/13030/qt3fp580tx 2024-01-07T09:41:20+01:00 Microbial Community and Functional Gene Changes in Arctic Tundra Soils in a Microcosm Warming Experiment Yang, Ziming Yang, Sihang Van Nostrand, Joy D Zhou, Jizhong Fang, Wei Qi, Qi Liu, Yurong Wullschleger, Stan D Liang, Liyuan Graham, David E Yang, Yunfeng Gu, Baohua 1741 2017-01-01 application/pdf https://escholarship.org/uc/item/3fp580tx unknown eScholarship, University of California qt3fp580tx https://escholarship.org/uc/item/3fp580tx public Frontiers in Microbiology, vol 8, iss SEP Microbiology Biological Sciences Climate Action soil organic carbon climate warming microbial community functional genes permafrost Environmental Science and Management Soil Sciences Medical microbiology article 2017 ftcdlib 2023-12-11T19:07:59Z Microbial decomposition of soil organic carbon (SOC) in thawing Arctic permafrost is important in determining greenhouse gas feedbacks of tundra ecosystems to climate. However, the changes in microbial community structure during SOC decomposition are poorly known. Here we examine these changes using frozen soils from Barrow, Alaska, USA, in anoxic microcosm incubation at -2 and 8°C for 122 days. The functional gene array GeoChip was used to determine microbial community structure and the functional genes associated with SOC degradation, methanogenesis, and Fe(III) reduction. Results show that soil incubation after 122 days at 8°C significantly decreased functional gene abundance (P < 0.05) associated with SOC degradation, fermentation, methanogenesis, and iron cycling, particularly in organic-rich soil. These observations correspond well with decreases in labile SOC content (e.g., reducing sugar and ethanol), methane and CO2 production, and Fe(III) reduction. In contrast, the community functional structure was largely unchanged in the -2°C incubation. Soil type (i.e., organic vs. mineral) and the availability of labile SOC were among the most significant factors impacting microbial community structure. These results demonstrate the important roles of microbial community in SOC degradation and support previous findings that SOC in organic-rich Arctic tundra is highly vulnerable to microbial degradation under warming. Article in Journal/Newspaper Arctic Barrow permafrost Tundra Alaska University of California: eScholarship Arctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Microbiology Biological Sciences Climate Action soil organic carbon climate warming microbial community functional genes permafrost Environmental Science and Management Soil Sciences Medical microbiology |
spellingShingle |
Microbiology Biological Sciences Climate Action soil organic carbon climate warming microbial community functional genes permafrost Environmental Science and Management Soil Sciences Medical microbiology Yang, Ziming Yang, Sihang Van Nostrand, Joy D Zhou, Jizhong Fang, Wei Qi, Qi Liu, Yurong Wullschleger, Stan D Liang, Liyuan Graham, David E Yang, Yunfeng Gu, Baohua Microbial Community and Functional Gene Changes in Arctic Tundra Soils in a Microcosm Warming Experiment |
topic_facet |
Microbiology Biological Sciences Climate Action soil organic carbon climate warming microbial community functional genes permafrost Environmental Science and Management Soil Sciences Medical microbiology |
description |
Microbial decomposition of soil organic carbon (SOC) in thawing Arctic permafrost is important in determining greenhouse gas feedbacks of tundra ecosystems to climate. However, the changes in microbial community structure during SOC decomposition are poorly known. Here we examine these changes using frozen soils from Barrow, Alaska, USA, in anoxic microcosm incubation at -2 and 8°C for 122 days. The functional gene array GeoChip was used to determine microbial community structure and the functional genes associated with SOC degradation, methanogenesis, and Fe(III) reduction. Results show that soil incubation after 122 days at 8°C significantly decreased functional gene abundance (P < 0.05) associated with SOC degradation, fermentation, methanogenesis, and iron cycling, particularly in organic-rich soil. These observations correspond well with decreases in labile SOC content (e.g., reducing sugar and ethanol), methane and CO2 production, and Fe(III) reduction. In contrast, the community functional structure was largely unchanged in the -2°C incubation. Soil type (i.e., organic vs. mineral) and the availability of labile SOC were among the most significant factors impacting microbial community structure. These results demonstrate the important roles of microbial community in SOC degradation and support previous findings that SOC in organic-rich Arctic tundra is highly vulnerable to microbial degradation under warming. |
format |
Article in Journal/Newspaper |
author |
Yang, Ziming Yang, Sihang Van Nostrand, Joy D Zhou, Jizhong Fang, Wei Qi, Qi Liu, Yurong Wullschleger, Stan D Liang, Liyuan Graham, David E Yang, Yunfeng Gu, Baohua |
author_facet |
Yang, Ziming Yang, Sihang Van Nostrand, Joy D Zhou, Jizhong Fang, Wei Qi, Qi Liu, Yurong Wullschleger, Stan D Liang, Liyuan Graham, David E Yang, Yunfeng Gu, Baohua |
author_sort |
Yang, Ziming |
title |
Microbial Community and Functional Gene Changes in Arctic Tundra Soils in a Microcosm Warming Experiment |
title_short |
Microbial Community and Functional Gene Changes in Arctic Tundra Soils in a Microcosm Warming Experiment |
title_full |
Microbial Community and Functional Gene Changes in Arctic Tundra Soils in a Microcosm Warming Experiment |
title_fullStr |
Microbial Community and Functional Gene Changes in Arctic Tundra Soils in a Microcosm Warming Experiment |
title_full_unstemmed |
Microbial Community and Functional Gene Changes in Arctic Tundra Soils in a Microcosm Warming Experiment |
title_sort |
microbial community and functional gene changes in arctic tundra soils in a microcosm warming experiment |
publisher |
eScholarship, University of California |
publishDate |
2017 |
url |
https://escholarship.org/uc/item/3fp580tx |
op_coverage |
1741 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow permafrost Tundra Alaska |
genre_facet |
Arctic Barrow permafrost Tundra Alaska |
op_source |
Frontiers in Microbiology, vol 8, iss SEP |
op_relation |
qt3fp580tx https://escholarship.org/uc/item/3fp580tx |
op_rights |
public |
_version_ |
1787422149045125120 |