Passive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region
Although the maritime Antarctic has undergone rapid warming, the effects on indigenous soil-inhabiting microorganisms are not well known. Passive warming experiments using open-top chamber (OTC) have been performed on the Fildes Peninsula in the maritime Antarctic since 2008. When the soil temperatu...
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ftunivctemuco:oai:repositoriodigital.uct.cl:10925/3767 2023-05-15T13:58:13+02:00 Passive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region Kim, Dockyu Park, Ha Ju Kim, Jung Ho Youn, Ui Joung Yang, Yung Hun Casanova Katny, Angelica Munoz Vargas, Cristina Venegas, Erick Zagal Park, Hyun Hong, Soon Gyu 2021-04-30T16:59:14Z http://repositoriodigital.uct.cl/handle/10925/3767 https://doi.org/10.1002/jobm.201700470 en eng WILEY JOURNAL OF BASIC MICROBIOLOGY,Vol.58,513-522,2018 http://repositoriodigital.uct.cl/handle/10925/3767 doi:10.1002/jobm.201700470 JOURNAL OF BASIC MICROBIOLOGY Antarctic soil degradation humic substances microbial community Article 2021 ftunivctemuco https://doi.org/10.1002/jobm.201700470 2021-05-01T23:51:31Z Although the maritime Antarctic has undergone rapid warming, the effects on indigenous soil-inhabiting microorganisms are not well known. Passive warming experiments using open-top chamber (OTC) have been performed on the Fildes Peninsula in the maritime Antarctic since 2008. When the soil temperature was measured at a depth of 2-5cm during the 2013-2015 summer seasons, the mean temperature inside OTC (OTC-In) increased by approximately 0.8 degrees C compared with outside OTC (OTC-Out), while soil chemical and physical characteristics did not change. Soils (2015 summer) from OTC-In and OTC-Out were subjected to analysis for change in microbial community and degradation rate of humic substances (HS, the largest pool of recalcitrant organic carbon in soil). Archaeal and bacterial communities in OTC-In were minimally affected by warming compared with those in OTC-Out, with archaeal methanogenic Thermoplasmata slightly increased in abundance. The abundance of heterotrophic fungi Ascomycota was significantly altered in OTC-In. Total bacterial and fungal biomass in OTC-In increased by 20% compared to OTC-Out, indicating that this may be due to increased microbial degradation activity for soil organic matter (SOM) including HS, which would result in the release of more low-molecular-weight growth substrates from SOM. Despite the effects of warming on the microbial community over the 8-years-experiments warming did not induce any detectable change in content or structure of polymeric HS. These results suggest that increased temperature may have significant and direct effects on soil microbial communities inhabiting maritime Antarctic and that soil microbes would subsequently provide more available carbon sources for other indigenous microbes. Article in Journal/Newspaper Antarc* Antarctic Repositorio Académico de la Universidad Católica de Temuco (UCT) Antarctic Fildes ENVELOPE(-58.817,-58.817,-62.217,-62.217) Fildes peninsula ENVELOPE(-58.948,-58.948,-62.182,-62.182) Journal of Basic Microbiology 58 6 513 522 |
institution |
Open Polar |
collection |
Repositorio Académico de la Universidad Católica de Temuco (UCT) |
op_collection_id |
ftunivctemuco |
language |
English |
topic |
Antarctic soil degradation humic substances microbial community |
spellingShingle |
Antarctic soil degradation humic substances microbial community Kim, Dockyu Park, Ha Ju Kim, Jung Ho Youn, Ui Joung Yang, Yung Hun Casanova Katny, Angelica Munoz Vargas, Cristina Venegas, Erick Zagal Park, Hyun Hong, Soon Gyu Passive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region |
topic_facet |
Antarctic soil degradation humic substances microbial community |
description |
Although the maritime Antarctic has undergone rapid warming, the effects on indigenous soil-inhabiting microorganisms are not well known. Passive warming experiments using open-top chamber (OTC) have been performed on the Fildes Peninsula in the maritime Antarctic since 2008. When the soil temperature was measured at a depth of 2-5cm during the 2013-2015 summer seasons, the mean temperature inside OTC (OTC-In) increased by approximately 0.8 degrees C compared with outside OTC (OTC-Out), while soil chemical and physical characteristics did not change. Soils (2015 summer) from OTC-In and OTC-Out were subjected to analysis for change in microbial community and degradation rate of humic substances (HS, the largest pool of recalcitrant organic carbon in soil). Archaeal and bacterial communities in OTC-In were minimally affected by warming compared with those in OTC-Out, with archaeal methanogenic Thermoplasmata slightly increased in abundance. The abundance of heterotrophic fungi Ascomycota was significantly altered in OTC-In. Total bacterial and fungal biomass in OTC-In increased by 20% compared to OTC-Out, indicating that this may be due to increased microbial degradation activity for soil organic matter (SOM) including HS, which would result in the release of more low-molecular-weight growth substrates from SOM. Despite the effects of warming on the microbial community over the 8-years-experiments warming did not induce any detectable change in content or structure of polymeric HS. These results suggest that increased temperature may have significant and direct effects on soil microbial communities inhabiting maritime Antarctic and that soil microbes would subsequently provide more available carbon sources for other indigenous microbes. |
format |
Article in Journal/Newspaper |
author |
Kim, Dockyu Park, Ha Ju Kim, Jung Ho Youn, Ui Joung Yang, Yung Hun Casanova Katny, Angelica Munoz Vargas, Cristina Venegas, Erick Zagal Park, Hyun Hong, Soon Gyu |
author_facet |
Kim, Dockyu Park, Ha Ju Kim, Jung Ho Youn, Ui Joung Yang, Yung Hun Casanova Katny, Angelica Munoz Vargas, Cristina Venegas, Erick Zagal Park, Hyun Hong, Soon Gyu |
author_sort |
Kim, Dockyu |
title |
Passive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region |
title_short |
Passive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region |
title_full |
Passive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region |
title_fullStr |
Passive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region |
title_full_unstemmed |
Passive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region |
title_sort |
passive warming effect on soil microbial community and humic substance degradation in maritime antarctic region |
publisher |
WILEY |
publishDate |
2021 |
url |
http://repositoriodigital.uct.cl/handle/10925/3767 https://doi.org/10.1002/jobm.201700470 |
long_lat |
ENVELOPE(-58.817,-58.817,-62.217,-62.217) ENVELOPE(-58.948,-58.948,-62.182,-62.182) |
geographic |
Antarctic Fildes Fildes peninsula |
geographic_facet |
Antarctic Fildes Fildes peninsula |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
JOURNAL OF BASIC MICROBIOLOGY |
op_relation |
JOURNAL OF BASIC MICROBIOLOGY,Vol.58,513-522,2018 http://repositoriodigital.uct.cl/handle/10925/3767 doi:10.1002/jobm.201700470 |
op_doi |
https://doi.org/10.1002/jobm.201700470 |
container_title |
Journal of Basic Microbiology |
container_volume |
58 |
container_issue |
6 |
container_start_page |
513 |
op_container_end_page |
522 |
_version_ |
1766266388896284672 |