CO2-C losses and carbon quality of selected Maritime Antarctic soils
Polar Regions are the most important soil carbon reservoirs on Earth. Monitoring soil carbon storage in a changing global climate context may indicate possible effects of climate change on terrestrial environments. In this regard, we need to understand the dynamics of soil organic matter in relation...
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Online Access: | http://hdl.handle.net/11449/74487 https://doi.org/10.1017/S0954102012000648 |
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ftunivespir:oai:repositorio.unesp.br:11449/74487 2023-07-02T03:30:07+02:00 CO2-C losses and carbon quality of selected Maritime Antarctic soils De Souza Carvalho, Juliana Vanir De Sámendonça, Eduardo La Scala Jr., Newton Reis, César Reis, Efrain Lázaro Schaefer, Carlos E.G.R. Universidade Estadual Paulista (UNESP) 2013-02-01 11-18 http://hdl.handle.net/11449/74487 https://doi.org/10.1017/S0954102012000648 eng eng Antarctic Science 1.394 0,643 http://dx.doi.org/10.1017/S0954102012000648 Antarctic Science, v. 25, n. 1, p. 11-18, 2013. 0954-1020 1365-2079 http://hdl.handle.net/11449/74487 doi:10.1017/S0954102012000648 WOS:000314147700003 2-s2.0-84873859989 2-s2.0-84873859989.pdf closedAccess C sequestration C stocks CO2 emission permafrost polar soils carbon dioxide carbon emission carbon sequestration fractionation global climate global warming humic substance humification mineralization polar region soil carbon soil organic matter soil temperature terrestrial environment Antarctica King George Island South Shetland Islands info:eu-repo/semantics/article 2013 ftunivespir https://doi.org/10.1017/S0954102012000648 2023-06-12T16:18:14Z Polar Regions are the most important soil carbon reservoirs on Earth. Monitoring soil carbon storage in a changing global climate context may indicate possible effects of climate change on terrestrial environments. In this regard, we need to understand the dynamics of soil organic matter in relation to its chemical characteristics. We evaluated the influence of chemical characteristics of humic substances on the process of soil organic matter mineralization in selected Maritime Antarctic soils. A laboratory assay was carried out with soils from five locations from King George Island. We determined the contents of total organic carbon, oxidizable carbon fractions of soil organic matter, and humic substances. Two in situ field experiments were carried out during two summers, in order to evaluate the CO2-C emissions in relation to soil temperature variations. The overall low amounts of soil organic matter in Maritime Antarctic soils have a low humification degree and reduced microbial activity. CO2-C emissions showed significant exponential relationship with temperature, suggesting a sharp increase in CO2-C emissions with a warming scenario, and Q10 values (the percentage increase in emission for a 10°C increase in soil temperature) were higher than values reported from elsewhere. The sensitivity of the CO2-C emission in relation to temperature was significantly correlated with the humification degree of soil organic matter and microbial activity for Antarctic soils. © 2012 Antarctic Science Ltd. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica King George Island permafrost South Shetland Islands Universidade Estadual Paulista São Paulo: Repositório Institucional UNESP Antarctic King George Island South Shetland Islands Antarctic Science 25 1 11 18 |
institution |
Open Polar |
collection |
Universidade Estadual Paulista São Paulo: Repositório Institucional UNESP |
op_collection_id |
ftunivespir |
language |
English |
topic |
C sequestration C stocks CO2 emission permafrost polar soils carbon dioxide carbon emission carbon sequestration fractionation global climate global warming humic substance humification mineralization polar region soil carbon soil organic matter soil temperature terrestrial environment Antarctica King George Island South Shetland Islands |
spellingShingle |
C sequestration C stocks CO2 emission permafrost polar soils carbon dioxide carbon emission carbon sequestration fractionation global climate global warming humic substance humification mineralization polar region soil carbon soil organic matter soil temperature terrestrial environment Antarctica King George Island South Shetland Islands De Souza Carvalho, Juliana Vanir De Sámendonça, Eduardo La Scala Jr., Newton Reis, César Reis, Efrain Lázaro Schaefer, Carlos E.G.R. CO2-C losses and carbon quality of selected Maritime Antarctic soils |
topic_facet |
C sequestration C stocks CO2 emission permafrost polar soils carbon dioxide carbon emission carbon sequestration fractionation global climate global warming humic substance humification mineralization polar region soil carbon soil organic matter soil temperature terrestrial environment Antarctica King George Island South Shetland Islands |
description |
Polar Regions are the most important soil carbon reservoirs on Earth. Monitoring soil carbon storage in a changing global climate context may indicate possible effects of climate change on terrestrial environments. In this regard, we need to understand the dynamics of soil organic matter in relation to its chemical characteristics. We evaluated the influence of chemical characteristics of humic substances on the process of soil organic matter mineralization in selected Maritime Antarctic soils. A laboratory assay was carried out with soils from five locations from King George Island. We determined the contents of total organic carbon, oxidizable carbon fractions of soil organic matter, and humic substances. Two in situ field experiments were carried out during two summers, in order to evaluate the CO2-C emissions in relation to soil temperature variations. The overall low amounts of soil organic matter in Maritime Antarctic soils have a low humification degree and reduced microbial activity. CO2-C emissions showed significant exponential relationship with temperature, suggesting a sharp increase in CO2-C emissions with a warming scenario, and Q10 values (the percentage increase in emission for a 10°C increase in soil temperature) were higher than values reported from elsewhere. The sensitivity of the CO2-C emission in relation to temperature was significantly correlated with the humification degree of soil organic matter and microbial activity for Antarctic soils. © 2012 Antarctic Science Ltd. |
author2 |
Universidade Estadual Paulista (UNESP) |
format |
Article in Journal/Newspaper |
author |
De Souza Carvalho, Juliana Vanir De Sámendonça, Eduardo La Scala Jr., Newton Reis, César Reis, Efrain Lázaro Schaefer, Carlos E.G.R. |
author_facet |
De Souza Carvalho, Juliana Vanir De Sámendonça, Eduardo La Scala Jr., Newton Reis, César Reis, Efrain Lázaro Schaefer, Carlos E.G.R. |
author_sort |
De Souza Carvalho, Juliana Vanir |
title |
CO2-C losses and carbon quality of selected Maritime Antarctic soils |
title_short |
CO2-C losses and carbon quality of selected Maritime Antarctic soils |
title_full |
CO2-C losses and carbon quality of selected Maritime Antarctic soils |
title_fullStr |
CO2-C losses and carbon quality of selected Maritime Antarctic soils |
title_full_unstemmed |
CO2-C losses and carbon quality of selected Maritime Antarctic soils |
title_sort |
co2-c losses and carbon quality of selected maritime antarctic soils |
publishDate |
2013 |
url |
http://hdl.handle.net/11449/74487 https://doi.org/10.1017/S0954102012000648 |
geographic |
Antarctic King George Island South Shetland Islands |
geographic_facet |
Antarctic King George Island South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Science Antarctica King George Island permafrost South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica King George Island permafrost South Shetland Islands |
op_relation |
Antarctic Science 1.394 0,643 http://dx.doi.org/10.1017/S0954102012000648 Antarctic Science, v. 25, n. 1, p. 11-18, 2013. 0954-1020 1365-2079 http://hdl.handle.net/11449/74487 doi:10.1017/S0954102012000648 WOS:000314147700003 2-s2.0-84873859989 2-s2.0-84873859989.pdf |
op_rights |
closedAccess |
op_doi |
https://doi.org/10.1017/S0954102012000648 |
container_title |
Antarctic Science |
container_volume |
25 |
container_issue |
1 |
container_start_page |
11 |
op_container_end_page |
18 |
_version_ |
1770274379000709120 |