Transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration
This is the author accepted manuscript. The final version is available from Wiley via the DOI in this record Potential land‐climate feedbacks in subarctic regions, where rapid warming is driving forest expansion into the tundra, may be mediated by differences in transpiration of different plant func...
Published in: | Ecohydrology |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2019
|
Subjects: | |
Online Access: | http://hdl.handle.net/10871/40613 https://doi.org/10.1002/eco.2190 |
id |
ftunivexeter:oai:ore.exeter.ac.uk:10871/40613 |
---|---|
record_format |
openpolar |
spelling |
ftunivexeter:oai:ore.exeter.ac.uk:10871/40613 2024-09-15T17:34:23+00:00 Transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration Sabater, AM Ward, HC Hill, TC Gornall, JL Wade, TJ Evans, JG Prieto‐Blanco, A Disney, M Phoenix, GK Williams, M Huntley, B Baxter, R Mencuccini, M Poyatos, R 2019 http://hdl.handle.net/10871/40613 https://doi.org/10.1002/eco.2190 en eng Wiley Published online 21 December 2019 doi:10.1002/eco.2190 ACIF –2017/9830 NE/D005795/1 CGL2014-JIN-55583 CGL2015-67466-R GR-2017-1001 http://hdl.handle.net/10871/40613 1936-0584 Ecohydrology © 2019 Wiley. All rights reserved 2020-12-21 Under embargo until 21 December 2020 in compliance with publisher policy http://www.rioxx.net/licenses/all-rights-reserved Arctic branch cuvettes eddy covariance evapotranspiration partitioning mountain birch tundra understorey Article 2019 ftunivexeter https://doi.org/10.1002/eco.2190 2024-07-29T03:24:16Z This is the author accepted manuscript. The final version is available from Wiley via the DOI in this record Potential land‐climate feedbacks in subarctic regions, where rapid warming is driving forest expansion into the tundra, may be mediated by differences in transpiration of different plant functional types. Here we assess the environmental controls of overstorey transpiration and its relevance for ecosystem evapotranspiration in subarctic deciduous woodlands. We measured overstorey transpiration of mountain birch canopies and ecosystem evapotranspiration in two locations in northern Fennoscandia, having dense (Abisko) and sparse (Kevo) overstories. For Kevo, we also upscale chamber‐measured understorey evapotranspiration from shrubs and lichen using a detailed land cover map. Sub‐daily evaporative fluxes were not affected by soil moisture, and showed similar controls by vapour pressure deficit and radiation across sites. At the daily timescale, increases in evaporative demand led to proportionally higher contributions of overstorey transpiration to ecosystem evapotranspiration. For the entire growing season, the overstorey transpired 33% of ecosystem evapotranspiration in Abisko and only 16% in Kevo. At this latter site, the understorey had a higher leaf area index and contributed more to ecosystem evapotranspiration compared to the overstorey birch canopy. In Abisko, growing season evapotranspiration was 27% higher than precipitation, consistent with a gradual soil moisture depletion over the summer. Our results show that overstorey canopy transpiration in subarctic deciduous woodlands is not the dominant evaporative flux. However, given the observed environmental sensitivity of evapotranspiration components, the role of deciduous trees in driving ecosystem evapotranspiration may increase with the predicted increases in tree cover and evaporative demand across subarctic regions. European Social Fund and Generalitat Valenciana (GVA) Natural Environment Research Council (NERC) MINECO MINECO/FEDER ... Article in Journal/Newspaper Abisko Fennoscandia Subarctic Tundra University of Exeter: Open Research Exeter (ORE) Ecohydrology 13 3 |
institution |
Open Polar |
collection |
University of Exeter: Open Research Exeter (ORE) |
op_collection_id |
ftunivexeter |
language |
English |
topic |
Arctic branch cuvettes eddy covariance evapotranspiration partitioning mountain birch tundra understorey |
spellingShingle |
Arctic branch cuvettes eddy covariance evapotranspiration partitioning mountain birch tundra understorey Sabater, AM Ward, HC Hill, TC Gornall, JL Wade, TJ Evans, JG Prieto‐Blanco, A Disney, M Phoenix, GK Williams, M Huntley, B Baxter, R Mencuccini, M Poyatos, R Transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration |
topic_facet |
Arctic branch cuvettes eddy covariance evapotranspiration partitioning mountain birch tundra understorey |
description |
This is the author accepted manuscript. The final version is available from Wiley via the DOI in this record Potential land‐climate feedbacks in subarctic regions, where rapid warming is driving forest expansion into the tundra, may be mediated by differences in transpiration of different plant functional types. Here we assess the environmental controls of overstorey transpiration and its relevance for ecosystem evapotranspiration in subarctic deciduous woodlands. We measured overstorey transpiration of mountain birch canopies and ecosystem evapotranspiration in two locations in northern Fennoscandia, having dense (Abisko) and sparse (Kevo) overstories. For Kevo, we also upscale chamber‐measured understorey evapotranspiration from shrubs and lichen using a detailed land cover map. Sub‐daily evaporative fluxes were not affected by soil moisture, and showed similar controls by vapour pressure deficit and radiation across sites. At the daily timescale, increases in evaporative demand led to proportionally higher contributions of overstorey transpiration to ecosystem evapotranspiration. For the entire growing season, the overstorey transpired 33% of ecosystem evapotranspiration in Abisko and only 16% in Kevo. At this latter site, the understorey had a higher leaf area index and contributed more to ecosystem evapotranspiration compared to the overstorey birch canopy. In Abisko, growing season evapotranspiration was 27% higher than precipitation, consistent with a gradual soil moisture depletion over the summer. Our results show that overstorey canopy transpiration in subarctic deciduous woodlands is not the dominant evaporative flux. However, given the observed environmental sensitivity of evapotranspiration components, the role of deciduous trees in driving ecosystem evapotranspiration may increase with the predicted increases in tree cover and evaporative demand across subarctic regions. European Social Fund and Generalitat Valenciana (GVA) Natural Environment Research Council (NERC) MINECO MINECO/FEDER ... |
format |
Article in Journal/Newspaper |
author |
Sabater, AM Ward, HC Hill, TC Gornall, JL Wade, TJ Evans, JG Prieto‐Blanco, A Disney, M Phoenix, GK Williams, M Huntley, B Baxter, R Mencuccini, M Poyatos, R |
author_facet |
Sabater, AM Ward, HC Hill, TC Gornall, JL Wade, TJ Evans, JG Prieto‐Blanco, A Disney, M Phoenix, GK Williams, M Huntley, B Baxter, R Mencuccini, M Poyatos, R |
author_sort |
Sabater, AM |
title |
Transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration |
title_short |
Transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration |
title_full |
Transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration |
title_fullStr |
Transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration |
title_full_unstemmed |
Transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration |
title_sort |
transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration |
publisher |
Wiley |
publishDate |
2019 |
url |
http://hdl.handle.net/10871/40613 https://doi.org/10.1002/eco.2190 |
genre |
Abisko Fennoscandia Subarctic Tundra |
genre_facet |
Abisko Fennoscandia Subarctic Tundra |
op_relation |
Published online 21 December 2019 doi:10.1002/eco.2190 ACIF –2017/9830 NE/D005795/1 CGL2014-JIN-55583 CGL2015-67466-R GR-2017-1001 http://hdl.handle.net/10871/40613 1936-0584 Ecohydrology |
op_rights |
© 2019 Wiley. All rights reserved 2020-12-21 Under embargo until 21 December 2020 in compliance with publisher policy http://www.rioxx.net/licenses/all-rights-reserved |
op_doi |
https://doi.org/10.1002/eco.2190 |
container_title |
Ecohydrology |
container_volume |
13 |
container_issue |
3 |
_version_ |
1810444335283437568 |