Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths.
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 mode...
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ftcdlib:oai:escholarship.org/ark:/13030/qt75r9309b 2023-05-15T15:11:41+02:00 Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths. Johnston, Eric R Hatt, Janet K He, Zhili Wu, Liyou Guo, Xue Luo, Yiqi Schuur, Edward AG Tiedje, James M Zhou, Jizhong Konstantinidis, Konstantinos T 15096 - 15105 2019-07-08 application/pdf https://escholarship.org/uc/item/75r9309b unknown eScholarship, University of California qt75r9309b https://escholarship.org/uc/item/75r9309b public Proceedings of the National Academy of Sciences of the United States of America, vol 116, iss 30 Carbon Dioxide Carbon RNA Ribosomal 16S Soil Models Statistical Soil Microbiology Temperature Phylogeny Alaska Arctic Regions Climate Change Carbon Cycle Microbiota Tundra Permafrost metagenomics MD Multidisciplinary article 2019 ftcdlib 2021-01-24T17:37:54Z 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 ∼1.1 °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 clade 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. Article in Journal/Newspaper Arctic Climate change permafrost Tundra Alaska University of California: eScholarship Arctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Carbon Dioxide Carbon RNA Ribosomal 16S Soil Models Statistical Soil Microbiology Temperature Phylogeny Alaska Arctic Regions Climate Change Carbon Cycle Microbiota Tundra Permafrost metagenomics MD Multidisciplinary |
spellingShingle |
Carbon Dioxide Carbon RNA Ribosomal 16S Soil Models Statistical Soil Microbiology Temperature Phylogeny Alaska Arctic Regions Climate Change Carbon Cycle Microbiota Tundra Permafrost metagenomics MD Multidisciplinary Johnston, Eric R Hatt, Janet K He, Zhili Wu, Liyou Guo, Xue Luo, Yiqi Schuur, Edward AG Tiedje, James M Zhou, Jizhong Konstantinidis, Konstantinos T Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths. |
topic_facet |
Carbon Dioxide Carbon RNA Ribosomal 16S Soil Models Statistical Soil Microbiology Temperature Phylogeny Alaska Arctic Regions Climate Change Carbon Cycle Microbiota Tundra Permafrost metagenomics MD Multidisciplinary |
description |
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 ∼1.1 °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 clade 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. |
format |
Article in Journal/Newspaper |
author |
Johnston, Eric R Hatt, Janet K He, Zhili Wu, Liyou Guo, Xue Luo, Yiqi Schuur, Edward AG Tiedje, James M Zhou, Jizhong Konstantinidis, Konstantinos T |
author_facet |
Johnston, Eric R Hatt, Janet K He, Zhili Wu, Liyou Guo, Xue Luo, Yiqi Schuur, Edward AG Tiedje, James M Zhou, Jizhong Konstantinidis, Konstantinos T |
author_sort |
Johnston, Eric R |
title |
Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths. |
title_short |
Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths. |
title_full |
Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths. |
title_fullStr |
Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths. |
title_full_unstemmed |
Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths. |
title_sort |
responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths. |
publisher |
eScholarship, University of California |
publishDate |
2019 |
url |
https://escholarship.org/uc/item/75r9309b |
op_coverage |
15096 - 15105 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost Tundra Alaska |
genre_facet |
Arctic Climate change permafrost Tundra Alaska |
op_source |
Proceedings of the National Academy of Sciences of the United States of America, vol 116, iss 30 |
op_relation |
qt75r9309b https://escholarship.org/uc/item/75r9309b |
op_rights |
public |
_version_ |
1766342508680314880 |