Long-term reindeer grazing limits warming-induced increases in CO2 released by tundra heath soil: potential role of soil C quality
© 2015 IOP Publishing Ltd. The current climate warming in the Arctic may increase the microbial degradation of vast pools of soil carbon (C); however, the temperature sensitivity of decomposition is often highly dependent on the quality of accumulated soil C. Grazing by reindeer (Rangifer tarandus L...
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ftunnottinghamrr:oai:nottingham-repository.worktribe.com:1116560 2023-05-15T15:13:09+02:00 Long-term reindeer grazing limits warming-induced increases in CO2 released by tundra heath soil: potential role of soil C quality Sjogersten Turner, Sofie Large, David Drage, Trevor Stark, Sari 2015-09-16 https://doi.org/10.1088/1748-9326/10/9/094020 https://nottingham-repository.worktribe.com/file/1116560/1/V%E4is%E4nen_2015_Environ._Res._Lett._10_094020 https://nottingham-repository.worktribe.com/output/1116560 unknown IOP Publishing https://nottingham-repository.worktribe.com/output/1116560 Environmental Research Letters Volume 10 Issue 9 doi:https://doi.org/10.1088/1748-9326/10/9/094020 https://nottingham-repository.worktribe.com/file/1116560/1/V%E4is%E4nen_2015_Environ._Res._Lett._10_094020 doi:10.1088/1748-9326/10/9/094020 openAccess http://creativecommons.org/licenses/by/3.0/ CC-BY Journal Article 2015 ftunnottinghamrr https://doi.org/10.1088/1748-9326/10/9/094020 2022-10-13T22:12:05Z © 2015 IOP Publishing Ltd. The current climate warming in the Arctic may increase the microbial degradation of vast pools of soil carbon (C); however, the temperature sensitivity of decomposition is often highly dependent on the quality of accumulated soil C. Grazing by reindeer (Rangifer tarandus L.) substantially affects the dominant vegetation and often increases graminoids in relation to dwarf shrubs in ecosystems, but the effect of this vegetation shift on the soil C quality has not been previously investigated. We analyzed the soil C quality and rate of microbially mediated CO2 release at different temperatures in long-term laboratory incubations using soils from lightly grazed dwarf shrub-dominated and heavily grazed graminoid-dominated tundra ecosystem. The soil C quality was characterized by solid-state cross-polarization magic angle spinning (CPMAS 13C NMR) spectroscopy, which showed a higher relative proportion of carbohydrate C under light grazing and higher relative proportion of aliphatic not-O-substituted C under heavy grazing. Initial measurements showed lower temperature sensitivity of the CO2 release in soils under light grazing compared with soil under heavy grazing, but the overall CO2 release rate and its temperature sensitivity increased under light grazing as the soil incubation progressed. At the end of incubation, significantly more carbohydrate C had been lost in soils under light grazing compared with heavy grazing. These findings indicate that there may be a link between the grazer-induced effects on soil C quality and the potential of soils to release CO2 to atmosphere. We suggest that vegetation shifts induced by grazing could influence the proportion of accumulated soil C that is vulnerable to microbial degradation under warming climate. Article in Journal/Newspaper Arctic Rangifer tarandus Tundra University of Nottingham: Repository@Nottingham Arctic Environmental Research Letters 10 9 094020 |
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© 2015 IOP Publishing Ltd. The current climate warming in the Arctic may increase the microbial degradation of vast pools of soil carbon (C); however, the temperature sensitivity of decomposition is often highly dependent on the quality of accumulated soil C. Grazing by reindeer (Rangifer tarandus L.) substantially affects the dominant vegetation and often increases graminoids in relation to dwarf shrubs in ecosystems, but the effect of this vegetation shift on the soil C quality has not been previously investigated. We analyzed the soil C quality and rate of microbially mediated CO2 release at different temperatures in long-term laboratory incubations using soils from lightly grazed dwarf shrub-dominated and heavily grazed graminoid-dominated tundra ecosystem. The soil C quality was characterized by solid-state cross-polarization magic angle spinning (CPMAS 13C NMR) spectroscopy, which showed a higher relative proportion of carbohydrate C under light grazing and higher relative proportion of aliphatic not-O-substituted C under heavy grazing. Initial measurements showed lower temperature sensitivity of the CO2 release in soils under light grazing compared with soil under heavy grazing, but the overall CO2 release rate and its temperature sensitivity increased under light grazing as the soil incubation progressed. At the end of incubation, significantly more carbohydrate C had been lost in soils under light grazing compared with heavy grazing. These findings indicate that there may be a link between the grazer-induced effects on soil C quality and the potential of soils to release CO2 to atmosphere. We suggest that vegetation shifts induced by grazing could influence the proportion of accumulated soil C that is vulnerable to microbial degradation under warming climate. |
format |
Article in Journal/Newspaper |
author |
Sjogersten Turner, Sofie Large, David Drage, Trevor Stark, Sari |
spellingShingle |
Sjogersten Turner, Sofie Large, David Drage, Trevor Stark, Sari Long-term reindeer grazing limits warming-induced increases in CO2 released by tundra heath soil: potential role of soil C quality |
author_facet |
Sjogersten Turner, Sofie Large, David Drage, Trevor Stark, Sari |
author_sort |
Sjogersten Turner, Sofie |
title |
Long-term reindeer grazing limits warming-induced increases in CO2 released by tundra heath soil: potential role of soil C quality |
title_short |
Long-term reindeer grazing limits warming-induced increases in CO2 released by tundra heath soil: potential role of soil C quality |
title_full |
Long-term reindeer grazing limits warming-induced increases in CO2 released by tundra heath soil: potential role of soil C quality |
title_fullStr |
Long-term reindeer grazing limits warming-induced increases in CO2 released by tundra heath soil: potential role of soil C quality |
title_full_unstemmed |
Long-term reindeer grazing limits warming-induced increases in CO2 released by tundra heath soil: potential role of soil C quality |
title_sort |
long-term reindeer grazing limits warming-induced increases in co2 released by tundra heath soil: potential role of soil c quality |
publisher |
IOP Publishing |
publishDate |
2015 |
url |
https://doi.org/10.1088/1748-9326/10/9/094020 https://nottingham-repository.worktribe.com/file/1116560/1/V%E4is%E4nen_2015_Environ._Res._Lett._10_094020 https://nottingham-repository.worktribe.com/output/1116560 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Rangifer tarandus Tundra |
genre_facet |
Arctic Rangifer tarandus Tundra |
op_relation |
https://nottingham-repository.worktribe.com/output/1116560 Environmental Research Letters Volume 10 Issue 9 doi:https://doi.org/10.1088/1748-9326/10/9/094020 https://nottingham-repository.worktribe.com/file/1116560/1/V%E4is%E4nen_2015_Environ._Res._Lett._10_094020 doi:10.1088/1748-9326/10/9/094020 |
op_rights |
openAccess http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1088/1748-9326/10/9/094020 |
container_title |
Environmental Research Letters |
container_volume |
10 |
container_issue |
9 |
container_start_page |
094020 |
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1766343748776624128 |