Abstract
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 200-400 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.
| Original language | English |
|---|---|
| Pages (from-to) | 1193-1202 |
| Number of pages | 10 |
| Journal | Canadian Journal of Botany |
| Volume | 80 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2002 Nov 1 |
| Externally published | Yes |
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Keywords
- Arctic semi-desert
- Climate change
- Net ecosystem production (NEP)
- Net primary production (NPP)
- Photosynthesis
- Salix polaris
ASJC Scopus subject areas
- Plant Science
Cite this
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.
In: Canadian Journal of Botany, Vol. 80, No. 11, 01.11.2002, p. 1193-1202.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Leaf photosynthetic characteristics and net primary production of the polar willow (Salix polaris) in a high arctic polar semi-desert, Ny-Ålesund, Svalbard
AU - Muraoka, Hiroyuki
AU - Uchida, Masaki
AU - Mishio, Masako
AU - Nakatsubo, Takayuki
AU - Kanda, Hiroshi
AU - Koizumi, Hiroshi
PY - 2002/11/1
Y1 - 2002/11/1
N2 - 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 200-400 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.
AB - 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 200-400 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.
KW - Arctic semi-desert
KW - Climate change
KW - Net ecosystem production (NEP)
KW - Net primary production (NPP)
KW - Photosynthesis
KW - Salix polaris
UR - http://www.scopus.com/inward/record.url?scp=0036879570&partnerID=8YFLogxK
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U2 - 10.1139/b02-108
DO - 10.1139/b02-108
M3 - Article
VL - 80
SP - 1193
EP - 1202
JO - Botany
JF - Botany
SN - 1916-2790
IS - 11
ER -