Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra
Large grazers are known to affect ecosystem functioning even to the degree where ecosystems transition to another vegetation state. Alongside the vegetation change, several features of ecosystem functioning, such as ecosystem carbon sink capacity and soil carbon mineralisation rates, may be altered....
Published in: | Ecosystems |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2019
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Online Access: | https://research.ulapland.fi/fi/publications/ab5d66f7-e840-4128-9fd9-38fc2b0385b7 https://doi.org/10.1007/s10021-018-0329-y http://www.scopus.com/inward/record.url?scp=85059548957&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85059548957&partnerID=8YFLogxK |
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ftulaplandcdispu:oai:lacris.ulapland.fi:publications/ab5d66f7-e840-4128-9fd9-38fc2b0385b7 2024-02-04T09:56:29+01:00 Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra Ylänne, Henni Stark, Sari 2019-08-15 https://research.ulapland.fi/fi/publications/ab5d66f7-e840-4128-9fd9-38fc2b0385b7 https://doi.org/10.1007/s10021-018-0329-y http://www.scopus.com/inward/record.url?scp=85059548957&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85059548957&partnerID=8YFLogxK eng eng https://research.ulapland.fi/fi/publications/ab5d66f7-e840-4128-9fd9-38fc2b0385b7 info:eu-repo/semantics/openAccess Ylänne , H & Stark , S 2019 , ' Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra ' , Ecosystems , vol. 22 , no. 5 , pp. 1145-1159 . https://doi.org/10.1007/s10021-018-0329-y carbon balance CO flux extracellular enzyme activities herbivory microbial respiration reindeer /dk/atira/pure/person/fieldofscience2010/1/18/1 name=Ecology evolutionary biology /dk/atira/pure/person/fieldofscience2010/1/18/3 name=Plant biology microbiology virology article 2019 ftulaplandcdispu https://doi.org/10.1007/s10021-018-0329-y 2024-01-11T00:03:26Z Large grazers are known to affect ecosystem functioning even to the degree where ecosystems transition to another vegetation state. Alongside the vegetation change, several features of ecosystem functioning, such as ecosystem carbon sink capacity and soil carbon mineralisation rates, may be altered. It has remained largely uninvestigated how the grazing effects on carbon cycling processes depend on the duration of grazing. Here, we hypothesised that grazing affects ecosystem carbon sink through plant-driven processes (for example, photosynthesis) on shorter time-scales, whereas on longer time-scales changes in soil-driven processes (for example, microbial activity) become more important contributing to a decreased carbon sink capacity. To test this hypothesis, we investigated key processes behind ecosystem carbon cycling in an area that recently had become dominated by graminoids due to a high reindeer grazing intensity and compared these to the processes in an area of decades old grazing-induced graminoid dominance and in an area of shrub dominance with little grazer influence. In contrast to our hypothesis, areas of both old and recent grassification showed a similar carbon sink capacity. Yet the individual fluxes varied depending on the time passed since the vegetation shift: ecosystem respiration and mid-season photosynthesis were higher under old than recent grassification. In contrast, the extracellular enzyme activities for carbon and phosphorus acquisition were similar regardless of the time elapsed since grazer-induced vegetation change. These results provide novel understanding on how ecosystem processes develop over time in response to changes in the intensity of herbivory. Moreover, they indicate that both autotrophic and heterotrophic processes are controlled through multiple drivers that likely change depending on the duration of herbivory. Article in Journal/Newspaper Arctic Arctic Tundra LaCRIS - University of Lapland Current Research System Arctic Ecosystems 22 5 1145 1159 |
institution |
Open Polar |
collection |
LaCRIS - University of Lapland Current Research System |
op_collection_id |
ftulaplandcdispu |
language |
English |
topic |
carbon balance CO flux extracellular enzyme activities herbivory microbial respiration reindeer /dk/atira/pure/person/fieldofscience2010/1/18/1 name=Ecology evolutionary biology /dk/atira/pure/person/fieldofscience2010/1/18/3 name=Plant biology microbiology virology |
spellingShingle |
carbon balance CO flux extracellular enzyme activities herbivory microbial respiration reindeer /dk/atira/pure/person/fieldofscience2010/1/18/1 name=Ecology evolutionary biology /dk/atira/pure/person/fieldofscience2010/1/18/3 name=Plant biology microbiology virology Ylänne, Henni Stark, Sari Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra |
topic_facet |
carbon balance CO flux extracellular enzyme activities herbivory microbial respiration reindeer /dk/atira/pure/person/fieldofscience2010/1/18/1 name=Ecology evolutionary biology /dk/atira/pure/person/fieldofscience2010/1/18/3 name=Plant biology microbiology virology |
description |
Large grazers are known to affect ecosystem functioning even to the degree where ecosystems transition to another vegetation state. Alongside the vegetation change, several features of ecosystem functioning, such as ecosystem carbon sink capacity and soil carbon mineralisation rates, may be altered. It has remained largely uninvestigated how the grazing effects on carbon cycling processes depend on the duration of grazing. Here, we hypothesised that grazing affects ecosystem carbon sink through plant-driven processes (for example, photosynthesis) on shorter time-scales, whereas on longer time-scales changes in soil-driven processes (for example, microbial activity) become more important contributing to a decreased carbon sink capacity. To test this hypothesis, we investigated key processes behind ecosystem carbon cycling in an area that recently had become dominated by graminoids due to a high reindeer grazing intensity and compared these to the processes in an area of decades old grazing-induced graminoid dominance and in an area of shrub dominance with little grazer influence. In contrast to our hypothesis, areas of both old and recent grassification showed a similar carbon sink capacity. Yet the individual fluxes varied depending on the time passed since the vegetation shift: ecosystem respiration and mid-season photosynthesis were higher under old than recent grassification. In contrast, the extracellular enzyme activities for carbon and phosphorus acquisition were similar regardless of the time elapsed since grazer-induced vegetation change. These results provide novel understanding on how ecosystem processes develop over time in response to changes in the intensity of herbivory. Moreover, they indicate that both autotrophic and heterotrophic processes are controlled through multiple drivers that likely change depending on the duration of herbivory. |
format |
Article in Journal/Newspaper |
author |
Ylänne, Henni Stark, Sari |
author_facet |
Ylänne, Henni Stark, Sari |
author_sort |
Ylänne, Henni |
title |
Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra |
title_short |
Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra |
title_full |
Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra |
title_fullStr |
Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra |
title_full_unstemmed |
Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra |
title_sort |
distinguishing rapid and slow c cycling feedbacks to grazing in sub-arctic tundra |
publishDate |
2019 |
url |
https://research.ulapland.fi/fi/publications/ab5d66f7-e840-4128-9fd9-38fc2b0385b7 https://doi.org/10.1007/s10021-018-0329-y http://www.scopus.com/inward/record.url?scp=85059548957&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85059548957&partnerID=8YFLogxK |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Tundra |
genre_facet |
Arctic Arctic Tundra |
op_source |
Ylänne , H & Stark , S 2019 , ' Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra ' , Ecosystems , vol. 22 , no. 5 , pp. 1145-1159 . https://doi.org/10.1007/s10021-018-0329-y |
op_relation |
https://research.ulapland.fi/fi/publications/ab5d66f7-e840-4128-9fd9-38fc2b0385b7 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s10021-018-0329-y |
container_title |
Ecosystems |
container_volume |
22 |
container_issue |
5 |
container_start_page |
1145 |
op_container_end_page |
1159 |
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1789960974479917056 |