Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions
Soils in polar environments have acted for thousands of years as carbon sinks. Now, about 1330–1580 Pg C of carbon is stored in these soils. However, as a result of global warming, soils are thawing and releasing greenhouse gases (GHG) such as methane and carbon dioxide. In order to help understand...
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ftawi:oai:epic.awi.de:57098 2024-09-15T18:08:08+00:00 Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions Laurent, Mélissa 2021 application/pdf https://epic.awi.de/id/eprint/57098/ https://epic.awi.de/id/eprint/57098/1/Msc_Laurent_Melissa.pdf https://hdl.handle.net/10013/epic.dbe5acda-85b3-4283-b127-b9d8c4014a70 unknown https://epic.awi.de/id/eprint/57098/1/Msc_Laurent_Melissa.pdf Laurent, M. (2021) Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions , Master thesis, Ecole Nationale Supérieure d’Environnement, des Géoressources et du Développement durable – Bordeaux INP. hdl:10013/epic.dbe5acda-85b3-4283-b127-b9d8c4014a70 info:eu-repo/semantics/embargoedAccess EPIC371 p. Thesis NonPeerReviewed info:eu-repo/semantics/other 2021 ftawi 2024-06-24T04:30:12Z Soils in polar environments have acted for thousands of years as carbon sinks. Now, about 1330–1580 Pg C of carbon is stored in these soils. However, as a result of global warming, soils are thawing and releasing greenhouse gases (GHG) such as methane and carbon dioxide. In order to help understand this phenomenon, this study focused on the relationship between carbon emissions and soil parameters, as well as microbial evolution during a permafrost thaw equivalent to the time of an Arctic summer. Therefore, these samples from the Lena Delta and samples with different moisture conditions were incubated at two different temperatures and microbiological assessment was performed in parallel. Samples located in upland or on the slop remained in a lag phase during the whole incubation, while those located in the floodplain showed a high production of CH4 and CO2. A relationship was established between these high productions and landscape localisation. Annual or biannual flooding allowed to establish favourable methanogenesis conditions. The presence of a higher number of methanogenic Archaea in the active layer of the floodplain supported this hypothesis. Thesis Global warming lena delta permafrost Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Soils in polar environments have acted for thousands of years as carbon sinks. Now, about 1330–1580 Pg C of carbon is stored in these soils. However, as a result of global warming, soils are thawing and releasing greenhouse gases (GHG) such as methane and carbon dioxide. In order to help understand this phenomenon, this study focused on the relationship between carbon emissions and soil parameters, as well as microbial evolution during a permafrost thaw equivalent to the time of an Arctic summer. Therefore, these samples from the Lena Delta and samples with different moisture conditions were incubated at two different temperatures and microbiological assessment was performed in parallel. Samples located in upland or on the slop remained in a lag phase during the whole incubation, while those located in the floodplain showed a high production of CH4 and CO2. A relationship was established between these high productions and landscape localisation. Annual or biannual flooding allowed to establish favourable methanogenesis conditions. The presence of a higher number of methanogenic Archaea in the active layer of the floodplain supported this hypothesis. |
format |
Thesis |
author |
Laurent, Mélissa |
spellingShingle |
Laurent, Mélissa Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions |
author_facet |
Laurent, Mélissa |
author_sort |
Laurent, Mélissa |
title |
Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions |
title_short |
Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions |
title_full |
Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions |
title_fullStr |
Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions |
title_full_unstemmed |
Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions |
title_sort |
links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/57098/ https://epic.awi.de/id/eprint/57098/1/Msc_Laurent_Melissa.pdf https://hdl.handle.net/10013/epic.dbe5acda-85b3-4283-b127-b9d8c4014a70 |
genre |
Global warming lena delta permafrost |
genre_facet |
Global warming lena delta permafrost |
op_source |
EPIC371 p. |
op_relation |
https://epic.awi.de/id/eprint/57098/1/Msc_Laurent_Melissa.pdf Laurent, M. (2021) Links between greenhouse gas emissions and microbes shift during short-term permafrost thaw under anaerobic conditions , Master thesis, Ecole Nationale Supérieure d’Environnement, des Géoressources et du Développement durable – Bordeaux INP. hdl:10013/epic.dbe5acda-85b3-4283-b127-b9d8c4014a70 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
_version_ |
1810445475259613184 |