Effects of fire on CO 2 , CH 4 , and N 2 O exchange in a well‐drained Arctic heath ecosystem

Wildfire frequency and expanse in the Arctic have increased in recent years and are projected to increase further with changes in climatic conditions due to warmer and drier summers. Yet, there is a lack of knowledge about the impacts such events may have on the net greenhouse gas (GHG) balances in...

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Published inGlobal change biology Vol. 28; no. 16; pp. 4882 - 4899
Main Authors Hermesdorf, Lena, Elberling, Bo, D'Imperio, Ludovica, Xu, Wenyi, Lambæk, Anders, Ambus, Per L.
Format Journal Article
LanguageEnglish
Published England 01.08.2022
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Abstract Wildfire frequency and expanse in the Arctic have increased in recent years and are projected to increase further with changes in climatic conditions due to warmer and drier summers. Yet, there is a lack of knowledge about the impacts such events may have on the net greenhouse gas (GHG) balances in Arctic ecosystems. We investigated in situ effects of an experimental fire in 2017 on carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O) surface fluxes in the most abundant tundra ecosystem in West Greenland in ambient and warmer conditions. Measurements from the growing seasons 2017 to 2019 showed that burnt areas became significant net CO 2 sources for the entire study period, driven by increased ecosystem respiration (ER) immediately after the fire and decreased gross ecosystem production (GEP). Warming by open‐top chambers significantly increased both ER and GEP in control, but not in burnt plots. In contrast to CO 2 , measurements suggest that the overall sink capacity of atmospheric CH 4 , as well as net N 2 O emissions, were not affected by fire in the short term, but only immediately after the fire. The minor effects on CH 4 and N 2 O, which was surprising given the significantly higher nitrate availability observed in burnt plots. However, the minor effects are aligned with the lack of significant effects of fire on soil moisture and soil temperature. Net uptake and emissions of all three GHG from burnt soils were less temperature‐sensitive than in the undisturbed control plots. Overall, this study highlights that wildfires in a typical tundra ecosystem in Greenland may not lead to markedly increased net GHG emissions other than CO 2 . Additional investigations are needed to assess the consequences of more severe fires.
AbstractList Wildfire frequency and expanse in the Arctic have increased in recent years and are projected to increase further with changes in climatic conditions due to warmer and drier summers. Yet, there is a lack of knowledge about the impacts such events may have on the net greenhouse gas (GHG) balances in Arctic ecosystems. We investigated in situ effects of an experimental fire in 2017 on carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O) surface fluxes in the most abundant tundra ecosystem in West Greenland in ambient and warmer conditions. Measurements from the growing seasons 2017 to 2019 showed that burnt areas became significant net CO 2 sources for the entire study period, driven by increased ecosystem respiration (ER) immediately after the fire and decreased gross ecosystem production (GEP). Warming by open‐top chambers significantly increased both ER and GEP in control, but not in burnt plots. In contrast to CO 2 , measurements suggest that the overall sink capacity of atmospheric CH 4 , as well as net N 2 O emissions, were not affected by fire in the short term, but only immediately after the fire. The minor effects on CH 4 and N 2 O, which was surprising given the significantly higher nitrate availability observed in burnt plots. However, the minor effects are aligned with the lack of significant effects of fire on soil moisture and soil temperature. Net uptake and emissions of all three GHG from burnt soils were less temperature‐sensitive than in the undisturbed control plots. Overall, this study highlights that wildfires in a typical tundra ecosystem in Greenland may not lead to markedly increased net GHG emissions other than CO 2 . Additional investigations are needed to assess the consequences of more severe fires.
Wildfire frequency and expanse in the Arctic have increased in recent years and are projected to increase further with changes in climatic conditions due to warmer and drier summers. Yet, there is a lack of knowledge about the impacts such events may have on the net greenhouse gas (GHG) balances in Arctic ecosystems. We investigated in situ effects of an experimental fire in 2017 on carbon dioxide (CO ), methane (CH ), and nitrous oxide (N O) surface fluxes in the most abundant tundra ecosystem in West Greenland in ambient and warmer conditions. Measurements from the growing seasons 2017 to 2019 showed that burnt areas became significant net CO sources for the entire study period, driven by increased ecosystem respiration (ER) immediately after the fire and decreased gross ecosystem production (GEP). Warming by open-top chambers significantly increased both ER and GEP in control, but not in burnt plots. In contrast to CO , measurements suggest that the overall sink capacity of atmospheric CH , as well as net N O emissions, were not affected by fire in the short term, but only immediately after the fire. The minor effects on CH and N O, which was surprising given the significantly higher nitrate availability observed in burnt plots. However, the minor effects are aligned with the lack of significant effects of fire on soil moisture and soil temperature. Net uptake and emissions of all three GHG from burnt soils were less temperature-sensitive than in the undisturbed control plots. Overall, this study highlights that wildfires in a typical tundra ecosystem in Greenland may not lead to markedly increased net GHG emissions other than CO . Additional investigations are needed to assess the consequences of more severe fires.
Author D'Imperio, Ludovica
Ambus, Per L.
Xu, Wenyi
Elberling, Bo
Hermesdorf, Lena
Lambæk, Anders
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Keywords tundra
carbon dioxide
nitrous oxide
methane
GHG balance
Greenland
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Snippet Wildfire frequency and expanse in the Arctic have increased in recent years and are projected to increase further with changes in climatic conditions due to...
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Title Effects of fire on CO 2 , CH 4 , and N 2 O exchange in a well‐drained Arctic heath ecosystem
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