Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria
Summary Heteropolymer humic substances (HS) are the largest constituents of soil organic matter and are key components that affect plant and microbial growth in maritime Antarctic tundra. We investigated HS decomposition in Antarctic tundra soils from distinct sites by incubating samples at 5°C or 8...
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Online Access: | http://dx.doi.org/10.1111/1462-2920.15849 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1462-2920.15849 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1462-2920.15849 |
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crwiley:10.1111/1462-2920.15849 2024-06-23T07:45:50+00:00 Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria Kim, Dockyu Park, Ha Ju Kim, Mincheol Lee, Seulah Hong, Soon Gyu Kim, Eungbin Lee, Hyoungseok Korea Polar Research Institute 2021 http://dx.doi.org/10.1111/1462-2920.15849 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1462-2920.15849 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1462-2920.15849 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Environmental Microbiology volume 24, issue 1, page 265-275 ISSN 1462-2912 1462-2920 journal-article 2021 crwiley https://doi.org/10.1111/1462-2920.15849 2024-06-11T04:40:32Z Summary Heteropolymer humic substances (HS) are the largest constituents of soil organic matter and are key components that affect plant and microbial growth in maritime Antarctic tundra. We investigated HS decomposition in Antarctic tundra soils from distinct sites by incubating samples at 5°C or 8°C (within a natural soil thawing temperature range of −3.8°C to 9.6°C) for 90 days (average Antarctic summer period). This continuous 3‐month artificial incubation maintained a higher total soil temperature than that in natural conditions. The long‐term warming effects rapidly decreased HS content during the initial incubation, with no significant difference between 5°C and 8°C. In the presence of Antarctic tundra soil heterogeneity, the relative abundance of Proteobacteria (one of the major bacterial phyla in cold soil environments) increased during HS decomposition, which was more significant at 8°C than at 5°C. Contrasting this, the relative abundance of Actinobacteria (another major group) did not exhibit any significant variation. This microcosm study indicates that higher temperatures or prolonged thawing periods affect the relative abundance of cold‐adapted bacterial communities, thereby promoting the rate of microbial HS decomposition. The resulting increase in HS‐derived small metabolites will possibly accelerate warming‐induced changes in the Antarctic tundra ecosystem. Article in Journal/Newspaper Antarc* Antarctic Tundra Wiley Online Library Antarctic The Antarctic Environmental Microbiology 24 1 265 275 |
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Wiley Online Library |
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crwiley |
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English |
description |
Summary Heteropolymer humic substances (HS) are the largest constituents of soil organic matter and are key components that affect plant and microbial growth in maritime Antarctic tundra. We investigated HS decomposition in Antarctic tundra soils from distinct sites by incubating samples at 5°C or 8°C (within a natural soil thawing temperature range of −3.8°C to 9.6°C) for 90 days (average Antarctic summer period). This continuous 3‐month artificial incubation maintained a higher total soil temperature than that in natural conditions. The long‐term warming effects rapidly decreased HS content during the initial incubation, with no significant difference between 5°C and 8°C. In the presence of Antarctic tundra soil heterogeneity, the relative abundance of Proteobacteria (one of the major bacterial phyla in cold soil environments) increased during HS decomposition, which was more significant at 8°C than at 5°C. Contrasting this, the relative abundance of Actinobacteria (another major group) did not exhibit any significant variation. This microcosm study indicates that higher temperatures or prolonged thawing periods affect the relative abundance of cold‐adapted bacterial communities, thereby promoting the rate of microbial HS decomposition. The resulting increase in HS‐derived small metabolites will possibly accelerate warming‐induced changes in the Antarctic tundra ecosystem. |
author2 |
Korea Polar Research Institute |
format |
Article in Journal/Newspaper |
author |
Kim, Dockyu Park, Ha Ju Kim, Mincheol Lee, Seulah Hong, Soon Gyu Kim, Eungbin Lee, Hyoungseok |
spellingShingle |
Kim, Dockyu Park, Ha Ju Kim, Mincheol Lee, Seulah Hong, Soon Gyu Kim, Eungbin Lee, Hyoungseok Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria |
author_facet |
Kim, Dockyu Park, Ha Ju Kim, Mincheol Lee, Seulah Hong, Soon Gyu Kim, Eungbin Lee, Hyoungseok |
author_sort |
Kim, Dockyu |
title |
Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria |
title_short |
Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria |
title_full |
Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria |
title_fullStr |
Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria |
title_full_unstemmed |
Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria |
title_sort |
temperature sensitivity of antarctic soil‐humic substance degradation by cold‐adapted bacteria |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/1462-2920.15849 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1462-2920.15849 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1462-2920.15849 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Tundra |
genre_facet |
Antarc* Antarctic Tundra |
op_source |
Environmental Microbiology volume 24, issue 1, page 265-275 ISSN 1462-2912 1462-2920 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1462-2920.15849 |
container_title |
Environmental Microbiology |
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24 |
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1 |
container_start_page |
265 |
op_container_end_page |
275 |
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1802642567684161536 |