Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem
Nitrogen (N) is a critical resource for plant growth in tundra ecosystems, and species differences in the timing of N uptake may be an important feature regulating community composition and ecosystem productivity. We added N-15-labelled glycine to a subarctic heath tundra dominated by dwarf shrubs,...
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2012
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Online Access: | https://curis.ku.dk/portal/da/publications/nitrogen-uptake-during-fall-winter-and-spring-differs-among-plant-functional-groups-in-a-subarctic-heath-ecosystem(1b4aad29-11f3-4435-a35e-d178cd5bb5c0).html https://doi.org/10.1007/s10021-012-9555-x |
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ftcopenhagenunip:oai:pure.atira.dk:publications/1b4aad29-11f3-4435-a35e-d178cd5bb5c0 2023-12-10T09:54:07+01:00 Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem Larsen, Klaus Steenberg Michelsen, Anders Jonasson, Sven Evert Beier, Claus Grogan, Paul 2012 https://curis.ku.dk/portal/da/publications/nitrogen-uptake-during-fall-winter-and-spring-differs-among-plant-functional-groups-in-a-subarctic-heath-ecosystem(1b4aad29-11f3-4435-a35e-d178cd5bb5c0).html https://doi.org/10.1007/s10021-012-9555-x eng eng info:eu-repo/semantics/closedAccess Larsen , K S , Michelsen , A , Jonasson , S E , Beier , C & Grogan , P 2012 , ' Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem ' , Ecosystems , vol. 15 , no. 6 , pp. 927-939 . https://doi.org/10.1007/s10021-012-9555-x article 2012 ftcopenhagenunip https://doi.org/10.1007/s10021-012-9555-x 2023-11-15T23:59:03Z Nitrogen (N) is a critical resource for plant growth in tundra ecosystems, and species differences in the timing of N uptake may be an important feature regulating community composition and ecosystem productivity. We added N-15-labelled glycine to a subarctic heath tundra dominated by dwarf shrubs, mosses and graminoids in fall, and investigated its partitioning among ecosystem components at several time points (October, November, April, May, June) through to the following spring/early summer. Soil microbes had acquired 65 +/- A 7% of the N-15 tracer by October, but this pool decreased through winter to 37 +/- A 7% by April indicating significant microbial N turnover prior to spring thaw. Only the evergreen dwarf shrubs showed active N-15 acquisition before early May indicating that they had the highest potential of all functional groups for acquiring nutrients that became available in early spring. The faster-growing deciduous shrubs did not resume N-15 acquisition until after early May indicating that they relied more on nitrogen made available later during the spring/early summer. The graminoids and mosses had no significant increases in N-15 tracer recovery or tissue N-15 tracer concentrations after the first harvest in October. However, the graminoids had the highest root N-15 tracer concentrations of all functional groups in October indicating that they primarily relied on N made available during summer and fall. Our results suggest a temporal differentiation among plant functional groups in the post-winter resumption of N uptake with evergreen dwarf shrubs having the highest potential for early N uptake, followed by deciduous dwarf shrubs and graminoids. Article in Journal/Newspaper Subarctic Tundra University of Copenhagen: Research Ecosystems 15 6 927 939 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
Nitrogen (N) is a critical resource for plant growth in tundra ecosystems, and species differences in the timing of N uptake may be an important feature regulating community composition and ecosystem productivity. We added N-15-labelled glycine to a subarctic heath tundra dominated by dwarf shrubs, mosses and graminoids in fall, and investigated its partitioning among ecosystem components at several time points (October, November, April, May, June) through to the following spring/early summer. Soil microbes had acquired 65 +/- A 7% of the N-15 tracer by October, but this pool decreased through winter to 37 +/- A 7% by April indicating significant microbial N turnover prior to spring thaw. Only the evergreen dwarf shrubs showed active N-15 acquisition before early May indicating that they had the highest potential of all functional groups for acquiring nutrients that became available in early spring. The faster-growing deciduous shrubs did not resume N-15 acquisition until after early May indicating that they relied more on nitrogen made available later during the spring/early summer. The graminoids and mosses had no significant increases in N-15 tracer recovery or tissue N-15 tracer concentrations after the first harvest in October. However, the graminoids had the highest root N-15 tracer concentrations of all functional groups in October indicating that they primarily relied on N made available during summer and fall. Our results suggest a temporal differentiation among plant functional groups in the post-winter resumption of N uptake with evergreen dwarf shrubs having the highest potential for early N uptake, followed by deciduous dwarf shrubs and graminoids. |
format |
Article in Journal/Newspaper |
author |
Larsen, Klaus Steenberg Michelsen, Anders Jonasson, Sven Evert Beier, Claus Grogan, Paul |
spellingShingle |
Larsen, Klaus Steenberg Michelsen, Anders Jonasson, Sven Evert Beier, Claus Grogan, Paul Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem |
author_facet |
Larsen, Klaus Steenberg Michelsen, Anders Jonasson, Sven Evert Beier, Claus Grogan, Paul |
author_sort |
Larsen, Klaus Steenberg |
title |
Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem |
title_short |
Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem |
title_full |
Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem |
title_fullStr |
Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem |
title_full_unstemmed |
Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem |
title_sort |
nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem |
publishDate |
2012 |
url |
https://curis.ku.dk/portal/da/publications/nitrogen-uptake-during-fall-winter-and-spring-differs-among-plant-functional-groups-in-a-subarctic-heath-ecosystem(1b4aad29-11f3-4435-a35e-d178cd5bb5c0).html https://doi.org/10.1007/s10021-012-9555-x |
genre |
Subarctic Tundra |
genre_facet |
Subarctic Tundra |
op_source |
Larsen , K S , Michelsen , A , Jonasson , S E , Beier , C & Grogan , P 2012 , ' Nitrogen uptake during fall, winter and spring differs among plant functional groups in a subarctic heath ecosystem ' , Ecosystems , vol. 15 , no. 6 , pp. 927-939 . https://doi.org/10.1007/s10021-012-9555-x |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1007/s10021-012-9555-x |
container_title |
Ecosystems |
container_volume |
15 |
container_issue |
6 |
container_start_page |
927 |
op_container_end_page |
939 |
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1784901391017312256 |