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....
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Online Access: | https://lup.lub.lu.se/record/864b0ac8-487f-4338-8416-8fc8f138bef5 https://doi.org/10.1007/s10021-018-0329-y |
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ftulundlup:oai:lup.lub.lu.se:864b0ac8-487f-4338-8416-8fc8f138bef5 2023-05-15T15:11:46+02:00 Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra Ylänne, Henni Stark, Sari 2019-01-02 https://lup.lub.lu.se/record/864b0ac8-487f-4338-8416-8fc8f138bef5 https://doi.org/10.1007/s10021-018-0329-y eng eng Springer https://lup.lub.lu.se/record/864b0ac8-487f-4338-8416-8fc8f138bef5 http://dx.doi.org/10.1007/s10021-018-0329-y scopus:85059548957 Ecosystems; 22(5), pp 1145-1159 (2019) ISSN: 1432-9840 Ecology carbon balance CO flux extracellular enzyme activities herbivory microbial respiration reindeer contributiontojournal/article info:eu-repo/semantics/article text 2019 ftulundlup https://doi.org/10.1007/s10021-018-0329-y 2023-02-01T23:36:34Z 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 Tundra Lund University Publications (LUP) Arctic Ecosystems 22 5 1145 1159 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Ecology carbon balance CO flux extracellular enzyme activities herbivory microbial respiration reindeer |
spellingShingle |
Ecology carbon balance CO flux extracellular enzyme activities herbivory microbial respiration reindeer Ylänne, Henni Stark, Sari Distinguishing Rapid and Slow C Cycling Feedbacks to Grazing in Sub-arctic Tundra |
topic_facet |
Ecology carbon balance CO flux extracellular enzyme activities herbivory microbial respiration reindeer |
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 |
publisher |
Springer |
publishDate |
2019 |
url |
https://lup.lub.lu.se/record/864b0ac8-487f-4338-8416-8fc8f138bef5 https://doi.org/10.1007/s10021-018-0329-y |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra |
genre_facet |
Arctic Tundra |
op_source |
Ecosystems; 22(5), pp 1145-1159 (2019) ISSN: 1432-9840 |
op_relation |
https://lup.lub.lu.se/record/864b0ac8-487f-4338-8416-8fc8f138bef5 http://dx.doi.org/10.1007/s10021-018-0329-y scopus:85059548957 |
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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