Impact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments
Abstract This study concerned the fragility of maritime Antarctic soils under increasing temperature, using the C dynamics and structural characteristics of humic substances as indicators. Working with four representative soils from King George Island (Lithic Thiomorphic Cryosol (LTC1 and LTC2), Orn...
Published in: | Antarctic Science |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2010
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0954102010000258 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102010000258 |
id |
crcambridgeupr:10.1017/s0954102010000258 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0954102010000258 2024-03-03T08:38:20+00:00 Impact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments de Souza Carvalho, Juliana Vanir de Sá Mendonça, Eduardo Barbosa, Rui Tarcísio Reis, Efrain Lázaro Seabra, Paulo Negrais Schaefer, Carlos Ernesto G.R. 2010 http://dx.doi.org/10.1017/s0954102010000258 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102010000258 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 22, issue 5, page 485-493 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2010 crcambridgeupr https://doi.org/10.1017/s0954102010000258 2024-02-08T08:43:44Z Abstract This study concerned the fragility of maritime Antarctic soils under increasing temperature, using the C dynamics and structural characteristics of humic substances as indicators. Working with four representative soils from King George Island (Lithic Thiomorphic Cryosol (LTC1 and LTC2), Ornithogenic Cryosol (OG) and Gelic Organosol (ORG)) we evaluated the total organic C and nitrogen contents, the oxidizable C and humic substances. Soil samples were incubated to assess the amount of C potentially mineralizable at temperatures typical of an Antarctic summer (5–14°C). Humic acids showed a higher aliphatic character and a smaller number of condensed aromatic groups, which suggests that these molecules from Antarctic soils are generally less resistant to microbial degradation than humic acids molecules from other regions. Based on 13 C NMR spectra of MAS and CP/MAS, samples of soil humic acids of mineral soils (LTC1 and LTC2) have a higher content of aliphatic C, and heteroatom C, with lower levels of carbonyl and aromatic C, when compared with organic matter-rich soils (OG and ORG). Increasing incubation temperature led to a higher rate of mineralizable C in all soils. A sequence of soil fragility was suggested - LTC1 and LTC2 > OG > ORG - which showed a correlation with the Q10 coefficient and the ratio of labile and recalcitrant C fractions of soil organic matter (R 2 = 0.83). Article in Journal/Newspaper Antarc* Antarctic Antarctic Science King George Island Cambridge University Press Antarctic King George Island Antarctic Science 22 5 485 493 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography de Souza Carvalho, Juliana Vanir de Sá Mendonça, Eduardo Barbosa, Rui Tarcísio Reis, Efrain Lázaro Seabra, Paulo Negrais Schaefer, Carlos Ernesto G.R. Impact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract This study concerned the fragility of maritime Antarctic soils under increasing temperature, using the C dynamics and structural characteristics of humic substances as indicators. Working with four representative soils from King George Island (Lithic Thiomorphic Cryosol (LTC1 and LTC2), Ornithogenic Cryosol (OG) and Gelic Organosol (ORG)) we evaluated the total organic C and nitrogen contents, the oxidizable C and humic substances. Soil samples were incubated to assess the amount of C potentially mineralizable at temperatures typical of an Antarctic summer (5–14°C). Humic acids showed a higher aliphatic character and a smaller number of condensed aromatic groups, which suggests that these molecules from Antarctic soils are generally less resistant to microbial degradation than humic acids molecules from other regions. Based on 13 C NMR spectra of MAS and CP/MAS, samples of soil humic acids of mineral soils (LTC1 and LTC2) have a higher content of aliphatic C, and heteroatom C, with lower levels of carbonyl and aromatic C, when compared with organic matter-rich soils (OG and ORG). Increasing incubation temperature led to a higher rate of mineralizable C in all soils. A sequence of soil fragility was suggested - LTC1 and LTC2 > OG > ORG - which showed a correlation with the Q10 coefficient and the ratio of labile and recalcitrant C fractions of soil organic matter (R 2 = 0.83). |
format |
Article in Journal/Newspaper |
author |
de Souza Carvalho, Juliana Vanir de Sá Mendonça, Eduardo Barbosa, Rui Tarcísio Reis, Efrain Lázaro Seabra, Paulo Negrais Schaefer, Carlos Ernesto G.R. |
author_facet |
de Souza Carvalho, Juliana Vanir de Sá Mendonça, Eduardo Barbosa, Rui Tarcísio Reis, Efrain Lázaro Seabra, Paulo Negrais Schaefer, Carlos Ernesto G.R. |
author_sort |
de Souza Carvalho, Juliana Vanir |
title |
Impact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments |
title_short |
Impact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments |
title_full |
Impact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments |
title_fullStr |
Impact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments |
title_full_unstemmed |
Impact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments |
title_sort |
impact of expected global warming on c mineralization in maritime antarctic soils: results of laboratory experiments |
publisher |
Cambridge University Press (CUP) |
publishDate |
2010 |
url |
http://dx.doi.org/10.1017/s0954102010000258 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102010000258 |
geographic |
Antarctic King George Island |
geographic_facet |
Antarctic King George Island |
genre |
Antarc* Antarctic Antarctic Science King George Island |
genre_facet |
Antarc* Antarctic Antarctic Science King George Island |
op_source |
Antarctic Science volume 22, issue 5, page 485-493 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102010000258 |
container_title |
Antarctic Science |
container_volume |
22 |
container_issue |
5 |
container_start_page |
485 |
op_container_end_page |
493 |
_version_ |
1792506716434202624 |