Leaf photosynthetic characteristics and net primary production of the polar willow ( Salix polaris) in a high arctic polar semi-desert, Ny-Ålesund, Svalbard
Photosynthetic characteristics and their leaf-age dependence were examined to estimate ecophysiological effects on net primary production (NPP) of a polar willow (Salix polaris), a dominant dwarf shrub species in a polar semi-desert area of Ny-Ålesund, Svalbard. Leaves of S. polaris emerged just aft...
Published in: | Canadian Journal of Botany |
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crcansciencepubl:10.1139/b02-108 2024-09-15T18:02:20+00:00 Leaf photosynthetic characteristics and net primary production of the polar willow ( Salix polaris) in a high arctic polar semi-desert, Ny-Ålesund, Svalbard Muraoka, Hiroyuki Uchida, Masaki Mishio, Masako Nakatsubo, Takayuki Kanda, Hiroshi Koizumi, Hiroshi 2002 http://dx.doi.org/10.1139/b02-108 http://www.nrcresearchpress.com/doi/pdf/10.1139/b02-108 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 80, issue 11, page 1193-1202 ISSN 0008-4026 journal-article 2002 crcansciencepubl https://doi.org/10.1139/b02-108 2024-08-29T04:08:50Z Photosynthetic characteristics and their leaf-age dependence were examined to estimate ecophysiological effects on net primary production (NPP) of a polar willow (Salix polaris), a dominant dwarf shrub species in a polar semi-desert area of Ny-Ålesund, Svalbard. Leaves of S. polaris emerged just after snowmelt in early July in 2000; flowers were initiated within 1 week, and fruits in late July. Light-saturated rate of photosynthesis and stomatal conductance to water vapor increased rapidly to their maximum values within 1 week after leaf emergence and then decreased gradually. Depending on the leaf age, photosynthetic rates saturated at photosynthetically active photon flux density (PPFD) of 200400 µmol·m 2 ·s 1 , which is the light level usually available in the natural habitat. Optimum leaf temperature of photosynthesis ranged from 10 to 18°C, while air temperature in the habitat ranged from 8 to 20°C. These light and temperature responses of photosynthesis of S. polaris would be suitable for efficient carbon gain in the natural habitat characterized by highly variable light and temperature conditions. Using the photosynthetic and respiratory characteristics, biomass distribution, and meteorological data, NPP of S. polaris in the current year was estimated to be 26.1 g C·m 2 . A model simulation of rising temperature conditions predicted a reduction of NPP because of a large increase in respiration. It was suggested that temperature condition and leaf phenological aspects strongly influence the carbon fixation by plants in the high arctic area studied.Key words: arctic semi-desert, climate change, net ecosystem production (NEP), net primary production (NPP), Salix polaris, photosynthesis. Article in Journal/Newspaper Climate change Ny Ålesund Ny-Ålesund Polar willow Salix polaris Svalbard Canadian Science Publishing Canadian Journal of Botany 80 11 1193 1202 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Photosynthetic characteristics and their leaf-age dependence were examined to estimate ecophysiological effects on net primary production (NPP) of a polar willow (Salix polaris), a dominant dwarf shrub species in a polar semi-desert area of Ny-Ålesund, Svalbard. Leaves of S. polaris emerged just after snowmelt in early July in 2000; flowers were initiated within 1 week, and fruits in late July. Light-saturated rate of photosynthesis and stomatal conductance to water vapor increased rapidly to their maximum values within 1 week after leaf emergence and then decreased gradually. Depending on the leaf age, photosynthetic rates saturated at photosynthetically active photon flux density (PPFD) of 200400 µmol·m 2 ·s 1 , which is the light level usually available in the natural habitat. Optimum leaf temperature of photosynthesis ranged from 10 to 18°C, while air temperature in the habitat ranged from 8 to 20°C. These light and temperature responses of photosynthesis of S. polaris would be suitable for efficient carbon gain in the natural habitat characterized by highly variable light and temperature conditions. Using the photosynthetic and respiratory characteristics, biomass distribution, and meteorological data, NPP of S. polaris in the current year was estimated to be 26.1 g C·m 2 . A model simulation of rising temperature conditions predicted a reduction of NPP because of a large increase in respiration. It was suggested that temperature condition and leaf phenological aspects strongly influence the carbon fixation by plants in the high arctic area studied.Key words: arctic semi-desert, climate change, net ecosystem production (NEP), net primary production (NPP), Salix polaris, photosynthesis. |
format |
Article in Journal/Newspaper |
author |
Muraoka, Hiroyuki Uchida, Masaki Mishio, Masako Nakatsubo, Takayuki Kanda, Hiroshi Koizumi, Hiroshi |
spellingShingle |
Muraoka, Hiroyuki Uchida, Masaki Mishio, Masako Nakatsubo, Takayuki Kanda, Hiroshi Koizumi, Hiroshi Leaf photosynthetic characteristics and net primary production of the polar willow ( Salix polaris) in a high arctic polar semi-desert, Ny-Ålesund, Svalbard |
author_facet |
Muraoka, Hiroyuki Uchida, Masaki Mishio, Masako Nakatsubo, Takayuki Kanda, Hiroshi Koizumi, Hiroshi |
author_sort |
Muraoka, Hiroyuki |
title |
Leaf photosynthetic characteristics and net primary production of the polar willow ( Salix polaris) in a high arctic polar semi-desert, Ny-Ålesund, Svalbard |
title_short |
Leaf photosynthetic characteristics and net primary production of the polar willow ( Salix polaris) in a high arctic polar semi-desert, Ny-Ålesund, Svalbard |
title_full |
Leaf photosynthetic characteristics and net primary production of the polar willow ( Salix polaris) in a high arctic polar semi-desert, Ny-Ålesund, Svalbard |
title_fullStr |
Leaf photosynthetic characteristics and net primary production of the polar willow ( Salix polaris) in a high arctic polar semi-desert, Ny-Ålesund, Svalbard |
title_full_unstemmed |
Leaf photosynthetic characteristics and net primary production of the polar willow ( Salix polaris) in a high arctic polar semi-desert, Ny-Ålesund, Svalbard |
title_sort |
leaf photosynthetic characteristics and net primary production of the polar willow ( salix polaris) in a high arctic polar semi-desert, ny-ålesund, svalbard |
publisher |
Canadian Science Publishing |
publishDate |
2002 |
url |
http://dx.doi.org/10.1139/b02-108 http://www.nrcresearchpress.com/doi/pdf/10.1139/b02-108 |
genre |
Climate change Ny Ålesund Ny-Ålesund Polar willow Salix polaris Svalbard |
genre_facet |
Climate change Ny Ålesund Ny-Ålesund Polar willow Salix polaris Svalbard |
op_source |
Canadian Journal of Botany volume 80, issue 11, page 1193-1202 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b02-108 |
container_title |
Canadian Journal of Botany |
container_volume |
80 |
container_issue |
11 |
container_start_page |
1193 |
op_container_end_page |
1202 |
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1810439797152415744 |