Arctic browning: Impacts of extreme climatic events on heathland ecosystem CO 2 fluxes
Abstract Extreme climatic events are among the drivers of recent declines in plant biomass and productivity observed across Arctic ecosystems, known as “Arctic browning.” These events can cause landscape‐scale vegetation damage and so are likely to have major impacts on ecosystem CO 2 balance. Howev...
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crwiley:10.1111/gcb.14500 2024-06-23T07:49:41+00:00 Arctic browning: Impacts of extreme climatic events on heathland ecosystem CO 2 fluxes Treharne, Rachael Bjerke, Jarle W. Tømmervik, Hans Stendardi, Laura Phoenix, Gareth K. Natural Environment Research Council 2018 http://dx.doi.org/10.1111/gcb.14500 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.14500 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.14500 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.14500 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Global Change Biology volume 25, issue 2, page 489-503 ISSN 1354-1013 1365-2486 journal-article 2018 crwiley https://doi.org/10.1111/gcb.14500 2024-06-13T04:23:24Z Abstract Extreme climatic events are among the drivers of recent declines in plant biomass and productivity observed across Arctic ecosystems, known as “Arctic browning.” These events can cause landscape‐scale vegetation damage and so are likely to have major impacts on ecosystem CO 2 balance. However, there is little understanding of the impacts on CO 2 fluxes, especially across the growing season. Furthermore, while widespread shoot mortality is commonly observed with browning events, recent observations show that shoot stress responses are also common, and manifest as high levels of persistent anthocyanin pigmentation. Whether or how this response impacts ecosystem CO 2 fluxes is not known. To address these research needs, a growing season assessment of browning impacts following frost drought and extreme winter warming (both extreme climatic events) on the key ecosystem CO 2 fluxes Net Ecosystem Exchange (NEE), Gross Primary Productivity (GPP), ecosystem respiration ( R eco ) and soil respiration ( R soil ) was carried out in widespread sub‐Arctic dwarf shrub heathland, incorporating both mortality and stress responses. Browning (mortality and stress responses combined) caused considerable site‐level reductions in GPP and NEE (of up to 44%), with greatest impacts occurring at early and late season. Furthermore, impacts on CO 2 fluxes associated with stress often equalled or exceeded those resulting from vegetation mortality. This demonstrates that extreme events can have major impacts on ecosystem CO 2 balance, considerably reducing the carbon sink capacity of the ecosystem, even where vegetation is not killed. Structural Equation Modelling and additional measurements, including decomposition rates and leaf respiration, provided further insight into mechanisms underlying impacts of mortality and stress on CO 2 fluxes. The scale of reductions in ecosystem CO 2 uptake highlights the need for a process‐based understanding of Arctic browning in order to predict how vegetation and CO 2 balance will respond to ... Article in Journal/Newspaper Arctic Wiley Online Library Arctic Browning ENVELOPE(164.050,164.050,-74.617,-74.617) Global Change Biology 25 2 489 503 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Extreme climatic events are among the drivers of recent declines in plant biomass and productivity observed across Arctic ecosystems, known as “Arctic browning.” These events can cause landscape‐scale vegetation damage and so are likely to have major impacts on ecosystem CO 2 balance. However, there is little understanding of the impacts on CO 2 fluxes, especially across the growing season. Furthermore, while widespread shoot mortality is commonly observed with browning events, recent observations show that shoot stress responses are also common, and manifest as high levels of persistent anthocyanin pigmentation. Whether or how this response impacts ecosystem CO 2 fluxes is not known. To address these research needs, a growing season assessment of browning impacts following frost drought and extreme winter warming (both extreme climatic events) on the key ecosystem CO 2 fluxes Net Ecosystem Exchange (NEE), Gross Primary Productivity (GPP), ecosystem respiration ( R eco ) and soil respiration ( R soil ) was carried out in widespread sub‐Arctic dwarf shrub heathland, incorporating both mortality and stress responses. Browning (mortality and stress responses combined) caused considerable site‐level reductions in GPP and NEE (of up to 44%), with greatest impacts occurring at early and late season. Furthermore, impacts on CO 2 fluxes associated with stress often equalled or exceeded those resulting from vegetation mortality. This demonstrates that extreme events can have major impacts on ecosystem CO 2 balance, considerably reducing the carbon sink capacity of the ecosystem, even where vegetation is not killed. Structural Equation Modelling and additional measurements, including decomposition rates and leaf respiration, provided further insight into mechanisms underlying impacts of mortality and stress on CO 2 fluxes. The scale of reductions in ecosystem CO 2 uptake highlights the need for a process‐based understanding of Arctic browning in order to predict how vegetation and CO 2 balance will respond to ... |
author2 |
Natural Environment Research Council |
format |
Article in Journal/Newspaper |
author |
Treharne, Rachael Bjerke, Jarle W. Tømmervik, Hans Stendardi, Laura Phoenix, Gareth K. |
spellingShingle |
Treharne, Rachael Bjerke, Jarle W. Tømmervik, Hans Stendardi, Laura Phoenix, Gareth K. Arctic browning: Impacts of extreme climatic events on heathland ecosystem CO 2 fluxes |
author_facet |
Treharne, Rachael Bjerke, Jarle W. Tømmervik, Hans Stendardi, Laura Phoenix, Gareth K. |
author_sort |
Treharne, Rachael |
title |
Arctic browning: Impacts of extreme climatic events on heathland ecosystem CO 2 fluxes |
title_short |
Arctic browning: Impacts of extreme climatic events on heathland ecosystem CO 2 fluxes |
title_full |
Arctic browning: Impacts of extreme climatic events on heathland ecosystem CO 2 fluxes |
title_fullStr |
Arctic browning: Impacts of extreme climatic events on heathland ecosystem CO 2 fluxes |
title_full_unstemmed |
Arctic browning: Impacts of extreme climatic events on heathland ecosystem CO 2 fluxes |
title_sort |
arctic browning: impacts of extreme climatic events on heathland ecosystem co 2 fluxes |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1111/gcb.14500 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.14500 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.14500 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.14500 |
long_lat |
ENVELOPE(164.050,164.050,-74.617,-74.617) |
geographic |
Arctic Browning |
geographic_facet |
Arctic Browning |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Global Change Biology volume 25, issue 2, page 489-503 ISSN 1354-1013 1365-2486 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/gcb.14500 |
container_title |
Global Change Biology |
container_volume |
25 |
container_issue |
2 |
container_start_page |
489 |
op_container_end_page |
503 |
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1802640268013338624 |