Respiration from soil and ground cover vegetation under tundra shrubs
Atmospheric warming is expected to cause shifts in arctic tundra vegetation composition, especially in the abundance and distribution of shrub species. Greater shrub abundance will impact the carbon exchanges between tundra ecosystems and the atmosphere, including ecosystem respiration. Here, total...
Published in: | Arctic, Antarctic, and Alpine Research |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2017
|
Subjects: | |
Online Access: | https://ir.library.carleton.ca/pub/16196 https://doi.org/10.1657/AAAR0016-064 |
id |
ftcarletonunivir:oai:carleton.ca:16196 |
---|---|
record_format |
openpolar |
spelling |
ftcarletonunivir:oai:carleton.ca:16196 2023-05-15T14:14:17+02:00 Respiration from soil and ground cover vegetation under tundra shrubs Ge, L. (Le) Lafleur, P.M. (Peter M.) Humphreys, E. (Elyn) 2017-11-01 https://ir.library.carleton.ca/pub/16196 https://doi.org/10.1657/AAAR0016-064 en eng https://ir.library.carleton.ca/pub/16196 doi:10.1657/AAAR0016-064 Arctic, Antarctic, and Alpine Research vol. 49 no. 4, pp. 537-550 info:eu-repo/semantics/article 2017 ftcarletonunivir https://doi.org/10.1657/AAAR0016-064 2022-02-06T21:51:43Z Atmospheric warming is expected to cause shifts in arctic tundra vegetation composition, especially in the abundance and distribution of shrub species. Greater shrub abundance will impact the carbon exchanges between tundra ecosystems and the atmosphere, including ecosystem respiration. Here, total respiration under the shrub canopy (RT) and its components soil respiration (RS) and respiration from the ground cover vegetation (RG) were investigated at three tundra sites in the Canadian Low Arctic with varying shrub coverage. Seasonal RT and RS mean values were significantly greater (P < 0.05) at the site with greatest shrub abundance; mean values were 3.70 and 3.22 μmol m-2 s-1, respectively. Mean RG did not differ among sites; mean values ranged from 0.45 to 0.52 μmol m-2 s-1. Soil temperature exerted a stronger control on RT and RS compared to soil moisture. Differences in RT and RS among sites were attributed to differences in soil properties, such as soil total N content and bulk density. These findings suggest that belowground sources of respired carbon dioxide in Low Arctic tundra may vary with long-term shrub expansion as soil microclimate conditions and physiochemical properties adjust to changes in shrub coverage. Article in Journal/Newspaper Antarctic and Alpine Research Arctic Arctic Tundra Carleton University's Institutional Repository Arctic Arctic, Antarctic, and Alpine Research 49 4 537 550 |
institution |
Open Polar |
collection |
Carleton University's Institutional Repository |
op_collection_id |
ftcarletonunivir |
language |
English |
description |
Atmospheric warming is expected to cause shifts in arctic tundra vegetation composition, especially in the abundance and distribution of shrub species. Greater shrub abundance will impact the carbon exchanges between tundra ecosystems and the atmosphere, including ecosystem respiration. Here, total respiration under the shrub canopy (RT) and its components soil respiration (RS) and respiration from the ground cover vegetation (RG) were investigated at three tundra sites in the Canadian Low Arctic with varying shrub coverage. Seasonal RT and RS mean values were significantly greater (P < 0.05) at the site with greatest shrub abundance; mean values were 3.70 and 3.22 μmol m-2 s-1, respectively. Mean RG did not differ among sites; mean values ranged from 0.45 to 0.52 μmol m-2 s-1. Soil temperature exerted a stronger control on RT and RS compared to soil moisture. Differences in RT and RS among sites were attributed to differences in soil properties, such as soil total N content and bulk density. These findings suggest that belowground sources of respired carbon dioxide in Low Arctic tundra may vary with long-term shrub expansion as soil microclimate conditions and physiochemical properties adjust to changes in shrub coverage. |
format |
Article in Journal/Newspaper |
author |
Ge, L. (Le) Lafleur, P.M. (Peter M.) Humphreys, E. (Elyn) |
spellingShingle |
Ge, L. (Le) Lafleur, P.M. (Peter M.) Humphreys, E. (Elyn) Respiration from soil and ground cover vegetation under tundra shrubs |
author_facet |
Ge, L. (Le) Lafleur, P.M. (Peter M.) Humphreys, E. (Elyn) |
author_sort |
Ge, L. (Le) |
title |
Respiration from soil and ground cover vegetation under tundra shrubs |
title_short |
Respiration from soil and ground cover vegetation under tundra shrubs |
title_full |
Respiration from soil and ground cover vegetation under tundra shrubs |
title_fullStr |
Respiration from soil and ground cover vegetation under tundra shrubs |
title_full_unstemmed |
Respiration from soil and ground cover vegetation under tundra shrubs |
title_sort |
respiration from soil and ground cover vegetation under tundra shrubs |
publishDate |
2017 |
url |
https://ir.library.carleton.ca/pub/16196 https://doi.org/10.1657/AAAR0016-064 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Antarctic and Alpine Research Arctic Arctic Tundra |
genre_facet |
Antarctic and Alpine Research Arctic Arctic Tundra |
op_source |
Arctic, Antarctic, and Alpine Research vol. 49 no. 4, pp. 537-550 |
op_relation |
https://ir.library.carleton.ca/pub/16196 doi:10.1657/AAAR0016-064 |
op_doi |
https://doi.org/10.1657/AAAR0016-064 |
container_title |
Arctic, Antarctic, and Alpine Research |
container_volume |
49 |
container_issue |
4 |
container_start_page |
537 |
op_container_end_page |
550 |
_version_ |
1766286835420495872 |