Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments
Half the global soil carbon (C) is held in high-latitude systems. Climate change will expose these to warming and a shift towards plant communities with more labile C input. Labile C can also increase the rate of loss of native soil organic matter (SOM); a phenomenon termed ‘priming’. We investigate...
Published in: | Global Change Biology |
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Online Access: | https://curis.ku.dk/portal/da/publications/microbial-control-of-soil-organic-matter-mineralization-responses-to-labile-carbon-in-subarctic-climate-change-treatments(c6619993-9910-40f8-9e6f-e2a3961453d9).html https://doi.org/10.1111/gcb.13296 |
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ftcopenhagenunip:oai:pure.atira.dk:publications/c6619993-9910-40f8-9e6f-e2a3961453d9 2024-04-21T08:12:26+00:00 Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments Rousk, Kathrin Michelsen, Anders Rousk, Johannes 2016 https://curis.ku.dk/portal/da/publications/microbial-control-of-soil-organic-matter-mineralization-responses-to-labile-carbon-in-subarctic-climate-change-treatments(c6619993-9910-40f8-9e6f-e2a3961453d9).html https://doi.org/10.1111/gcb.13296 eng eng info:eu-repo/semantics/closedAccess Rousk , K , Michelsen , A & Rousk , J 2016 , ' Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments ' , Global Change Biology , vol. 22 , no. 12 , pp. 4150-4161 . https://doi.org/10.1111/gcb.13296 bacterial growth biogeochemistry fungal growth microbial ecology nitrogen cycling nitrogen limitation soil carbon sequestration the priming effect article 2016 ftcopenhagenunip https://doi.org/10.1111/gcb.13296 2024-03-28T01:21:42Z Half the global soil carbon (C) is held in high-latitude systems. Climate change will expose these to warming and a shift towards plant communities with more labile C input. Labile C can also increase the rate of loss of native soil organic matter (SOM); a phenomenon termed ‘priming’. We investigated how warming (+1.1 °C over ambient using open top chambers) and litter addition (90 g m −2 yr −1 ) treatments in the subarctic influenced the susceptibility of SOM mineralization to priming, and its microbial underpinnings. Labile C appeared to inhibit the mineralization of C from SOM by up to 60% within hours. In contrast, the mineralization of N from SOM was stimulated by up to 300%. These responses occurred rapidly and were unrelated to microbial successional dynamics, suggesting catabolic responses. Considered separately, the labile C inhibited C mineralization is compatible with previously reported findings termed ‘preferential substrate utilization’ or ‘negative apparent priming’, while the stimulated N mineralization responses echo recent reports of ‘real priming’ of SOM mineralization. However, C and N mineralization responses derived from the same SOM source must be interpreted together: This suggested that the microbial SOM-use decreased in magnitude and shifted to components richer in N. This finding highlights that only considering SOM in terms of C may be simplistic, and will not capture all changes in SOM decomposition. The selective mining for N increased in climate change treatments with higher fungal dominance. In conclusion, labile C appeared to trigger catabolic responses of the resident microbial community that shifted the SOM mining to N-rich components; an effect that increased with higher fungal dominance. Extrapolating from these findings, the predicted shrub expansion in the subarctic could result in an altered microbial use of SOM, selectively mining it for N-rich components, and leading to a reduced total SOM-use. Article in Journal/Newspaper Subarctic University of Copenhagen: Research Global Change Biology 22 12 4150 4161 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
bacterial growth biogeochemistry fungal growth microbial ecology nitrogen cycling nitrogen limitation soil carbon sequestration the priming effect |
spellingShingle |
bacterial growth biogeochemistry fungal growth microbial ecology nitrogen cycling nitrogen limitation soil carbon sequestration the priming effect Rousk, Kathrin Michelsen, Anders Rousk, Johannes Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments |
topic_facet |
bacterial growth biogeochemistry fungal growth microbial ecology nitrogen cycling nitrogen limitation soil carbon sequestration the priming effect |
description |
Half the global soil carbon (C) is held in high-latitude systems. Climate change will expose these to warming and a shift towards plant communities with more labile C input. Labile C can also increase the rate of loss of native soil organic matter (SOM); a phenomenon termed ‘priming’. We investigated how warming (+1.1 °C over ambient using open top chambers) and litter addition (90 g m −2 yr −1 ) treatments in the subarctic influenced the susceptibility of SOM mineralization to priming, and its microbial underpinnings. Labile C appeared to inhibit the mineralization of C from SOM by up to 60% within hours. In contrast, the mineralization of N from SOM was stimulated by up to 300%. These responses occurred rapidly and were unrelated to microbial successional dynamics, suggesting catabolic responses. Considered separately, the labile C inhibited C mineralization is compatible with previously reported findings termed ‘preferential substrate utilization’ or ‘negative apparent priming’, while the stimulated N mineralization responses echo recent reports of ‘real priming’ of SOM mineralization. However, C and N mineralization responses derived from the same SOM source must be interpreted together: This suggested that the microbial SOM-use decreased in magnitude and shifted to components richer in N. This finding highlights that only considering SOM in terms of C may be simplistic, and will not capture all changes in SOM decomposition. The selective mining for N increased in climate change treatments with higher fungal dominance. In conclusion, labile C appeared to trigger catabolic responses of the resident microbial community that shifted the SOM mining to N-rich components; an effect that increased with higher fungal dominance. Extrapolating from these findings, the predicted shrub expansion in the subarctic could result in an altered microbial use of SOM, selectively mining it for N-rich components, and leading to a reduced total SOM-use. |
format |
Article in Journal/Newspaper |
author |
Rousk, Kathrin Michelsen, Anders Rousk, Johannes |
author_facet |
Rousk, Kathrin Michelsen, Anders Rousk, Johannes |
author_sort |
Rousk, Kathrin |
title |
Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments |
title_short |
Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments |
title_full |
Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments |
title_fullStr |
Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments |
title_full_unstemmed |
Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments |
title_sort |
microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments |
publishDate |
2016 |
url |
https://curis.ku.dk/portal/da/publications/microbial-control-of-soil-organic-matter-mineralization-responses-to-labile-carbon-in-subarctic-climate-change-treatments(c6619993-9910-40f8-9e6f-e2a3961453d9).html https://doi.org/10.1111/gcb.13296 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Rousk , K , Michelsen , A & Rousk , J 2016 , ' Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments ' , Global Change Biology , vol. 22 , no. 12 , pp. 4150-4161 . https://doi.org/10.1111/gcb.13296 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1111/gcb.13296 |
container_title |
Global Change Biology |
container_volume |
22 |
container_issue |
12 |
container_start_page |
4150 |
op_container_end_page |
4161 |
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1796932473958957056 |