Methane and Root Dynamics in Arctic Soil:Responses to Experimental Summer Warming and Winter Snow Accumulation
The projections for the end of the century across regions indicate that the Arctic will experience the largest increases in air temperature, especially during winter and spring time. As a consequence, the carbon (C) balance of the Arctic may be altered potentially leading to a positive feedback on t...
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Department of Geosciences and Natural Resource Management, Faculty of Science, University of Copenhagen
2016
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ftcopenhagenunip:oai:pure.atira.dk:publications/dedba16b-32b4-4d76-9d6b-6c19c2b1ad33 2023-05-15T14:24:19+02:00 Methane and Root Dynamics in Arctic Soil:Responses to Experimental Summer Warming and Winter Snow Accumulation D'Imperio, Ludovica 2016 https://curis.ku.dk/portal/da/publications/methane-and-root-dynamics-in-arctic-soil(dedba16b-32b4-4d76-9d6b-6c19c2b1ad33).html https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122734772705763 eng eng Department of Geosciences and Natural Resource Management, Faculty of Science, University of Copenhagen info:eu-repo/semantics/closedAccess D'Imperio , L 2016 , Methane and Root Dynamics in Arctic Soil : Responses to Experimental Summer Warming and Winter Snow Accumulation . Department of Geosciences and Natural Resource Management, Faculty of Science, University of Copenhagen . < https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122734772705763 > book 2016 ftcopenhagenunip 2023-03-08T23:55:00Z The projections for the end of the century across regions indicate that the Arctic will experience the largest increases in air temperature, especially during winter and spring time. As a consequence, the carbon (C) balance of the Arctic may be altered potentially leading to a positive feedback on the global climate. We investigated two aspects of arctic ecosystem dynamics which are not well represented in climatic models: i) soil methane (CH4) oxidation in dry heath tundra and barren soils and ii) root dynamics in wetlands. Field measurements were carried out during the growing season in Disko Island, West Greenland, and CH4 and root dynamics were assessed in response to experimentally increased winter snow precipitation, summer warming and their interaction to better understand their contribution to the C balance of the Arctic. Our results indicate that both the dry heath and barren soils have a large capacity to oxidize CH4 which seems mainly controlled by soil moisture. Short-term responses to climatic manipulations (1-2 years) suggest that increased winter snow precipitation may reduce CH4 oxidation rates due to increased soil moisture after thawing. On the other hand, increased summer air temperature may enhance soil CH4 oxidation rates as a consequence of increased soil temperature and evapotranspiration. Bearing in mind the large distribution of dry tundra soils over the Arctic and their strong potential to oxidize CH4, these ecosystems could play a central role in offsetting CH4 emissions from wetlands in a future warmer climate. At the wet fen increased winter snow precipitation delayed the onset of the growing season of about a week and reduced the relative fine root production. The use of minirhizotrons improved our understanding of root growth and phenology. Total root number, length and maximum growth positively responded to experimental air warming, especially in the deeper soil layers; possibly due to an indirect effect of increased canopy temperature on the above-ground biomass. These initial ... Book Arctic Arctic Greenland Tundra University of Copenhagen: Research Arctic Greenland |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
The projections for the end of the century across regions indicate that the Arctic will experience the largest increases in air temperature, especially during winter and spring time. As a consequence, the carbon (C) balance of the Arctic may be altered potentially leading to a positive feedback on the global climate. We investigated two aspects of arctic ecosystem dynamics which are not well represented in climatic models: i) soil methane (CH4) oxidation in dry heath tundra and barren soils and ii) root dynamics in wetlands. Field measurements were carried out during the growing season in Disko Island, West Greenland, and CH4 and root dynamics were assessed in response to experimentally increased winter snow precipitation, summer warming and their interaction to better understand their contribution to the C balance of the Arctic. Our results indicate that both the dry heath and barren soils have a large capacity to oxidize CH4 which seems mainly controlled by soil moisture. Short-term responses to climatic manipulations (1-2 years) suggest that increased winter snow precipitation may reduce CH4 oxidation rates due to increased soil moisture after thawing. On the other hand, increased summer air temperature may enhance soil CH4 oxidation rates as a consequence of increased soil temperature and evapotranspiration. Bearing in mind the large distribution of dry tundra soils over the Arctic and their strong potential to oxidize CH4, these ecosystems could play a central role in offsetting CH4 emissions from wetlands in a future warmer climate. At the wet fen increased winter snow precipitation delayed the onset of the growing season of about a week and reduced the relative fine root production. The use of minirhizotrons improved our understanding of root growth and phenology. Total root number, length and maximum growth positively responded to experimental air warming, especially in the deeper soil layers; possibly due to an indirect effect of increased canopy temperature on the above-ground biomass. These initial ... |
format |
Book |
author |
D'Imperio, Ludovica |
spellingShingle |
D'Imperio, Ludovica Methane and Root Dynamics in Arctic Soil:Responses to Experimental Summer Warming and Winter Snow Accumulation |
author_facet |
D'Imperio, Ludovica |
author_sort |
D'Imperio, Ludovica |
title |
Methane and Root Dynamics in Arctic Soil:Responses to Experimental Summer Warming and Winter Snow Accumulation |
title_short |
Methane and Root Dynamics in Arctic Soil:Responses to Experimental Summer Warming and Winter Snow Accumulation |
title_full |
Methane and Root Dynamics in Arctic Soil:Responses to Experimental Summer Warming and Winter Snow Accumulation |
title_fullStr |
Methane and Root Dynamics in Arctic Soil:Responses to Experimental Summer Warming and Winter Snow Accumulation |
title_full_unstemmed |
Methane and Root Dynamics in Arctic Soil:Responses to Experimental Summer Warming and Winter Snow Accumulation |
title_sort |
methane and root dynamics in arctic soil:responses to experimental summer warming and winter snow accumulation |
publisher |
Department of Geosciences and Natural Resource Management, Faculty of Science, University of Copenhagen |
publishDate |
2016 |
url |
https://curis.ku.dk/portal/da/publications/methane-and-root-dynamics-in-arctic-soil(dedba16b-32b4-4d76-9d6b-6c19c2b1ad33).html https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122734772705763 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Greenland Tundra |
genre_facet |
Arctic Arctic Greenland Tundra |
op_source |
D'Imperio , L 2016 , Methane and Root Dynamics in Arctic Soil : Responses to Experimental Summer Warming and Winter Snow Accumulation . Department of Geosciences and Natural Resource Management, Faculty of Science, University of Copenhagen . < https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122734772705763 > |
op_rights |
info:eu-repo/semantics/closedAccess |
_version_ |
1766296754149392384 |