Impact of three decades of warming, increased nutrient availability, and increased cloudiness on the fluxes of greenhouse gases and biogenic volatile organic compounds in a subarctic tundra heath
Abstract Climate change is exposing subarctic ecosystems to higher temperatures, increased nutrient availability, and increasing cloud cover. In this study, we assessed how these factors affect the fluxes of greenhouse gases (GHGs) (i.e., methane (CH 4 ), nitrous oxide (N 2 O), and carbon dioxide (C...
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Online Access: | http://dx.doi.org/10.1111/gcb.17416 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.17416 |
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crwiley:10.1111/gcb.17416 2024-09-15T18:37:52+00:00 Impact of three decades of warming, increased nutrient availability, and increased cloudiness on the fluxes of greenhouse gases and biogenic volatile organic compounds in a subarctic tundra heath Ndah, Flobert A. Michelsen, Anders Rinnan, Riikka Maljanen, Marja Mikkonen, Santtu Kivimäenpää, Minna Suomen Kulttuurirahasto Academy of Finland 2024 http://dx.doi.org/10.1111/gcb.17416 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.17416 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Global Change Biology volume 30, issue 7 ISSN 1354-1013 1365-2486 journal-article 2024 crwiley https://doi.org/10.1111/gcb.17416 2024-08-30T04:12:05Z Abstract Climate change is exposing subarctic ecosystems to higher temperatures, increased nutrient availability, and increasing cloud cover. In this study, we assessed how these factors affect the fluxes of greenhouse gases (GHGs) (i.e., methane (CH 4 ), nitrous oxide (N 2 O), and carbon dioxide (CO 2 )), and biogenic volatile organic compounds (BVOCs) in a subarctic mesic heath subjected to 34 years of climate change related manipulations of temperature, nutrient availability, and light. GHGs were sampled from static chambers and gases analyzed with gas chromatograph. BVOCs were measured using the push‐pull method and gases analyzed with chromatography–mass spectrometry. The soil temperature and moisture content in the warmed and shaded plots did not differ significantly from that in the controls during GHG and BVOC measurements. Also, the enclosure temperatures during BVOC measurements in the warmed and shaded plots did not differ significantly from temperatures in the controls. Hence, this allowed for assessment of long‐term effects of the climate treatment manipulations without interference of temperature and moisture differences at the time of measurements. Warming enhanced CH 4 uptake and the emissions of CO 2 , N 2 O, and isoprene. Increased nutrient availability increased the emissions of CO 2 and N 2 O but caused no significant changes in the fluxes of CH 4 and BVOCs. Shading (simulating increased cloudiness) enhanced CH 4 uptake but caused no significant changes in the fluxes of other gases compared to the controls. The results show that climate warming and increased cloudiness will enhance CH 4 sink strength of subarctic mesic heath ecosystems, providing negative climate feedback, while climate warming and enhanced nutrient availability will provide positive climate feedback through increased emissions of CO 2 and N 2 O. Climate warming will also indirectly, through vegetation changes, increase the amount of carbon lost as isoprene from subarctic ecosystems. Article in Journal/Newspaper Subarctic Tundra Wiley Online Library Global Change Biology 30 7 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Climate change is exposing subarctic ecosystems to higher temperatures, increased nutrient availability, and increasing cloud cover. In this study, we assessed how these factors affect the fluxes of greenhouse gases (GHGs) (i.e., methane (CH 4 ), nitrous oxide (N 2 O), and carbon dioxide (CO 2 )), and biogenic volatile organic compounds (BVOCs) in a subarctic mesic heath subjected to 34 years of climate change related manipulations of temperature, nutrient availability, and light. GHGs were sampled from static chambers and gases analyzed with gas chromatograph. BVOCs were measured using the push‐pull method and gases analyzed with chromatography–mass spectrometry. The soil temperature and moisture content in the warmed and shaded plots did not differ significantly from that in the controls during GHG and BVOC measurements. Also, the enclosure temperatures during BVOC measurements in the warmed and shaded plots did not differ significantly from temperatures in the controls. Hence, this allowed for assessment of long‐term effects of the climate treatment manipulations without interference of temperature and moisture differences at the time of measurements. Warming enhanced CH 4 uptake and the emissions of CO 2 , N 2 O, and isoprene. Increased nutrient availability increased the emissions of CO 2 and N 2 O but caused no significant changes in the fluxes of CH 4 and BVOCs. Shading (simulating increased cloudiness) enhanced CH 4 uptake but caused no significant changes in the fluxes of other gases compared to the controls. The results show that climate warming and increased cloudiness will enhance CH 4 sink strength of subarctic mesic heath ecosystems, providing negative climate feedback, while climate warming and enhanced nutrient availability will provide positive climate feedback through increased emissions of CO 2 and N 2 O. Climate warming will also indirectly, through vegetation changes, increase the amount of carbon lost as isoprene from subarctic ecosystems. |
author2 |
Suomen Kulttuurirahasto Academy of Finland |
format |
Article in Journal/Newspaper |
author |
Ndah, Flobert A. Michelsen, Anders Rinnan, Riikka Maljanen, Marja Mikkonen, Santtu Kivimäenpää, Minna |
spellingShingle |
Ndah, Flobert A. Michelsen, Anders Rinnan, Riikka Maljanen, Marja Mikkonen, Santtu Kivimäenpää, Minna Impact of three decades of warming, increased nutrient availability, and increased cloudiness on the fluxes of greenhouse gases and biogenic volatile organic compounds in a subarctic tundra heath |
author_facet |
Ndah, Flobert A. Michelsen, Anders Rinnan, Riikka Maljanen, Marja Mikkonen, Santtu Kivimäenpää, Minna |
author_sort |
Ndah, Flobert A. |
title |
Impact of three decades of warming, increased nutrient availability, and increased cloudiness on the fluxes of greenhouse gases and biogenic volatile organic compounds in a subarctic tundra heath |
title_short |
Impact of three decades of warming, increased nutrient availability, and increased cloudiness on the fluxes of greenhouse gases and biogenic volatile organic compounds in a subarctic tundra heath |
title_full |
Impact of three decades of warming, increased nutrient availability, and increased cloudiness on the fluxes of greenhouse gases and biogenic volatile organic compounds in a subarctic tundra heath |
title_fullStr |
Impact of three decades of warming, increased nutrient availability, and increased cloudiness on the fluxes of greenhouse gases and biogenic volatile organic compounds in a subarctic tundra heath |
title_full_unstemmed |
Impact of three decades of warming, increased nutrient availability, and increased cloudiness on the fluxes of greenhouse gases and biogenic volatile organic compounds in a subarctic tundra heath |
title_sort |
impact of three decades of warming, increased nutrient availability, and increased cloudiness on the fluxes of greenhouse gases and biogenic volatile organic compounds in a subarctic tundra heath |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1111/gcb.17416 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.17416 |
genre |
Subarctic Tundra |
genre_facet |
Subarctic Tundra |
op_source |
Global Change Biology volume 30, issue 7 ISSN 1354-1013 1365-2486 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/gcb.17416 |
container_title |
Global Change Biology |
container_volume |
30 |
container_issue |
7 |
_version_ |
1810482207942246400 |