Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels
Full recovery of the ozone layer is not expected for several decades and consequently, the incoming level of solar ultraviolet-B (UV-B) will only slowly be reduced. Therefore to investigate the structural and photosynthetic responses to changes in solar UV-B we conducted a 5-year UV-B exclusion stud...
Published in: | Physiologia Plantarum |
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2012
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Online Access: | https://curis.ku.dk/portal/da/publications/longterm-structural-canopy-changes-sustain-net-photosynthesis-per-ground-area-in-high-arctic-vaccinium-uliginosum-exposed-to-changes-in-nearambient-uvb-levels(f72177e5-00d5-4581-a240-d24b2ceb8948).html https://doi.org/10.1111/j.1399-3054.2011.01564.x |
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ftcopenhagenunip:oai:pure.atira.dk:publications/f72177e5-00d5-4581-a240-d24b2ceb8948 2023-05-15T14:26:20+02:00 Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels Boesgaard, Kristine Stove Albert, Kristian Rost Ro-Poulsen, Helge Michelsen, Anders Mikkelsen, Teis Nørgaard Schmidt, Niels Martin 2012 https://curis.ku.dk/portal/da/publications/longterm-structural-canopy-changes-sustain-net-photosynthesis-per-ground-area-in-high-arctic-vaccinium-uliginosum-exposed-to-changes-in-nearambient-uvb-levels(f72177e5-00d5-4581-a240-d24b2ceb8948).html https://doi.org/10.1111/j.1399-3054.2011.01564.x eng eng info:eu-repo/semantics/restrictedAccess Boesgaard , K S , Albert , K R , Ro-Poulsen , H , Michelsen , A , Mikkelsen , T N & Schmidt , N M 2012 , ' Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels ' , Physiologia Plantarum , vol. 145 , no. 4 , pp. 540-550 . https://doi.org/10.1111/j.1399-3054.2011.01564.x article 2012 ftcopenhagenunip https://doi.org/10.1111/j.1399-3054.2011.01564.x 2022-02-24T00:07:07Z Full recovery of the ozone layer is not expected for several decades and consequently, the incoming level of solar ultraviolet-B (UV-B) will only slowly be reduced. Therefore to investigate the structural and photosynthetic responses to changes in solar UV-B we conducted a 5-year UV-B exclusion study in high arctic Greenland. During the growing season, the gas exchange (H2O and CO2) and chlorophyll-a fluorescence were measured in Vaccinium uliginosum. The leaf dry weight, carbon, nitrogen, stable carbon isotope ratio, chlorophyll and carotenoid content were determined from a late season harvest. The net photosynthesis per leaf area was on average 22% higher in 61% reduced UV-B treatment across the season, but per ground area photosynthesis was unchanged. The leaf level increase in photosynthesis was accompanied by increased leaf nitrogen, higher stomatal conductance and Fv/Fm. There was no change in total leaf biomass, but reduction in total leaf area caused a pronounced reduction of specific leaf area and leaf area index in reduced UV-B. This demonstrates the structural changes to counterbalance the reduced plant carbon uptake seen per leaf area in ambient UV-B as the resulting plant carbon uptake per ground area was not affected. Thus, our understanding of long-term responses to UV-B reduction must take into account both leaf level processes as well as structural changes to understand the apparent robustness of plant carbon uptake per ground area. In this perspective, V. uliginosum seems able to adjust plant carbon uptake to the present amount of solar UV-B radiation in the High Arctic Article in Journal/Newspaper Arctic Arctic Greenland University of Copenhagen: Research Arctic Greenland Physiologia Plantarum 145 4 540 550 |
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Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
Full recovery of the ozone layer is not expected for several decades and consequently, the incoming level of solar ultraviolet-B (UV-B) will only slowly be reduced. Therefore to investigate the structural and photosynthetic responses to changes in solar UV-B we conducted a 5-year UV-B exclusion study in high arctic Greenland. During the growing season, the gas exchange (H2O and CO2) and chlorophyll-a fluorescence were measured in Vaccinium uliginosum. The leaf dry weight, carbon, nitrogen, stable carbon isotope ratio, chlorophyll and carotenoid content were determined from a late season harvest. The net photosynthesis per leaf area was on average 22% higher in 61% reduced UV-B treatment across the season, but per ground area photosynthesis was unchanged. The leaf level increase in photosynthesis was accompanied by increased leaf nitrogen, higher stomatal conductance and Fv/Fm. There was no change in total leaf biomass, but reduction in total leaf area caused a pronounced reduction of specific leaf area and leaf area index in reduced UV-B. This demonstrates the structural changes to counterbalance the reduced plant carbon uptake seen per leaf area in ambient UV-B as the resulting plant carbon uptake per ground area was not affected. Thus, our understanding of long-term responses to UV-B reduction must take into account both leaf level processes as well as structural changes to understand the apparent robustness of plant carbon uptake per ground area. In this perspective, V. uliginosum seems able to adjust plant carbon uptake to the present amount of solar UV-B radiation in the High Arctic |
format |
Article in Journal/Newspaper |
author |
Boesgaard, Kristine Stove Albert, Kristian Rost Ro-Poulsen, Helge Michelsen, Anders Mikkelsen, Teis Nørgaard Schmidt, Niels Martin |
spellingShingle |
Boesgaard, Kristine Stove Albert, Kristian Rost Ro-Poulsen, Helge Michelsen, Anders Mikkelsen, Teis Nørgaard Schmidt, Niels Martin Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels |
author_facet |
Boesgaard, Kristine Stove Albert, Kristian Rost Ro-Poulsen, Helge Michelsen, Anders Mikkelsen, Teis Nørgaard Schmidt, Niels Martin |
author_sort |
Boesgaard, Kristine Stove |
title |
Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels |
title_short |
Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels |
title_full |
Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels |
title_fullStr |
Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels |
title_full_unstemmed |
Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels |
title_sort |
long-term structural canopy changes sustain net photosynthesis per ground area in high arctic vaccinium uliginosum exposed to changes in near-ambient uv-b levels |
publishDate |
2012 |
url |
https://curis.ku.dk/portal/da/publications/longterm-structural-canopy-changes-sustain-net-photosynthesis-per-ground-area-in-high-arctic-vaccinium-uliginosum-exposed-to-changes-in-nearambient-uvb-levels(f72177e5-00d5-4581-a240-d24b2ceb8948).html https://doi.org/10.1111/j.1399-3054.2011.01564.x |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Greenland |
genre_facet |
Arctic Arctic Greenland |
op_source |
Boesgaard , K S , Albert , K R , Ro-Poulsen , H , Michelsen , A , Mikkelsen , T N & Schmidt , N M 2012 , ' Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels ' , Physiologia Plantarum , vol. 145 , no. 4 , pp. 540-550 . https://doi.org/10.1111/j.1399-3054.2011.01564.x |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/j.1399-3054.2011.01564.x |
container_title |
Physiologia Plantarum |
container_volume |
145 |
container_issue |
4 |
container_start_page |
540 |
op_container_end_page |
550 |
_version_ |
1766298840930975744 |