Microbiome structure and functional potential in permafrost soils of the Western Canadian Arctic
ABSTRACT Substantial amounts of topsoil organic matter (OM) in Arctic Cryosols have been translocated by the process of cryoturbation into deeper soil horizons (cryoOM), reducing its decomposition. Recent Arctic warming deepens the Cryosols´ active layer, making more topsoil and cryoOM carbon access...
Published in: | FEMS Microbiology Ecology |
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Oxford University Press (OUP)
2021
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croxfordunivpr:10.1093/femsec/fiab008 2024-06-23T07:49:49+00:00 Microbiome structure and functional potential in permafrost soils of the Western Canadian Arctic Varsadiya, Milan Urich, Tim Hugelius, Gustaf Bárta, Jiří 2021 http://dx.doi.org/10.1093/femsec/fiab008 http://academic.oup.com/femsec/advance-article-pdf/doi/10.1093/femsec/fiab008/35902780/fiab008.pdf http://academic.oup.com/femsec/article-pdf/97/3/fiab008/36522280/fiab008.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model FEMS Microbiology Ecology volume 97, issue 3 ISSN 1574-6941 journal-article 2021 croxfordunivpr https://doi.org/10.1093/femsec/fiab008 2024-06-11T04:18:51Z ABSTRACT Substantial amounts of topsoil organic matter (OM) in Arctic Cryosols have been translocated by the process of cryoturbation into deeper soil horizons (cryoOM), reducing its decomposition. Recent Arctic warming deepens the Cryosols´ active layer, making more topsoil and cryoOM carbon accessible for microbial transformation. To quantify bacteria, archaea and selected microbial groups (methanogens – mcrA gene and diazotrophs – nifH gene) and to investigate bacterial and archaeal diversity, we collected 83 soil samples from four different soil horizons of three distinct tundra types located in Qikiqtaruk (Hershel Island, Western Canada). In general, the abundance of bacteria and diazotrophs decreased from topsoil to permafrost, but not for cryoOM. No such difference was observed for archaea and methanogens. CryoOM was enriched with oligotrophic (slow-growing microorganism) taxa capable of recalcitrant OM degradation. We found distinct microbial patterns in each tundra type: topsoil from wet-polygonal tundra had the lowest abundance of bacteria and diazotrophs, but the highest abundance of methanogens. Wet-polygonal tundra, therefore, represented a hotspot for methanogenesis. Oligotrophic and copiotrophic (fast-growing microorganism) genera of methanogens and diazotrophs were distinctly distributed in topsoil and cryoOM, resulting in different rates of nitrogen flux into these horizons affecting OM vulnerability and potential CO2 and CH4 release. Article in Journal/Newspaper Arctic permafrost Tundra Oxford University Press Arctic Canada FEMS Microbiology Ecology 97 3 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
description |
ABSTRACT Substantial amounts of topsoil organic matter (OM) in Arctic Cryosols have been translocated by the process of cryoturbation into deeper soil horizons (cryoOM), reducing its decomposition. Recent Arctic warming deepens the Cryosols´ active layer, making more topsoil and cryoOM carbon accessible for microbial transformation. To quantify bacteria, archaea and selected microbial groups (methanogens – mcrA gene and diazotrophs – nifH gene) and to investigate bacterial and archaeal diversity, we collected 83 soil samples from four different soil horizons of three distinct tundra types located in Qikiqtaruk (Hershel Island, Western Canada). In general, the abundance of bacteria and diazotrophs decreased from topsoil to permafrost, but not for cryoOM. No such difference was observed for archaea and methanogens. CryoOM was enriched with oligotrophic (slow-growing microorganism) taxa capable of recalcitrant OM degradation. We found distinct microbial patterns in each tundra type: topsoil from wet-polygonal tundra had the lowest abundance of bacteria and diazotrophs, but the highest abundance of methanogens. Wet-polygonal tundra, therefore, represented a hotspot for methanogenesis. Oligotrophic and copiotrophic (fast-growing microorganism) genera of methanogens and diazotrophs were distinctly distributed in topsoil and cryoOM, resulting in different rates of nitrogen flux into these horizons affecting OM vulnerability and potential CO2 and CH4 release. |
format |
Article in Journal/Newspaper |
author |
Varsadiya, Milan Urich, Tim Hugelius, Gustaf Bárta, Jiří |
spellingShingle |
Varsadiya, Milan Urich, Tim Hugelius, Gustaf Bárta, Jiří Microbiome structure and functional potential in permafrost soils of the Western Canadian Arctic |
author_facet |
Varsadiya, Milan Urich, Tim Hugelius, Gustaf Bárta, Jiří |
author_sort |
Varsadiya, Milan |
title |
Microbiome structure and functional potential in permafrost soils of the Western Canadian Arctic |
title_short |
Microbiome structure and functional potential in permafrost soils of the Western Canadian Arctic |
title_full |
Microbiome structure and functional potential in permafrost soils of the Western Canadian Arctic |
title_fullStr |
Microbiome structure and functional potential in permafrost soils of the Western Canadian Arctic |
title_full_unstemmed |
Microbiome structure and functional potential in permafrost soils of the Western Canadian Arctic |
title_sort |
microbiome structure and functional potential in permafrost soils of the western canadian arctic |
publisher |
Oxford University Press (OUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1093/femsec/fiab008 http://academic.oup.com/femsec/advance-article-pdf/doi/10.1093/femsec/fiab008/35902780/fiab008.pdf http://academic.oup.com/femsec/article-pdf/97/3/fiab008/36522280/fiab008.pdf |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic permafrost Tundra |
genre_facet |
Arctic permafrost Tundra |
op_source |
FEMS Microbiology Ecology volume 97, issue 3 ISSN 1574-6941 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/femsec/fiab008 |
container_title |
FEMS Microbiology Ecology |
container_volume |
97 |
container_issue |
3 |
_version_ |
1802640496349151232 |