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Photosynthetic characteristics and biomass distribution of the dominant vascular plant species in a high Arctic tundra ecosystem, Ny-Ålesund, Svalbard: implications for their role in ecosystem carbon gain

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Journal of Plant Research : Volume 121, Issue 1, January 2008

Journal of Plant Research : Volume 120

Journal of Plant Research : Volume 119

Journal of Plant Research : Volume 118

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Photosynthetic characteristics and biomass distribution of the dominant vascular plant species in a high Arctic tundra ecosystem, Ny-Ålesund, Svalbard: implications for their role in ecosystem carbon gain

Content Provider	Springer Nature Link
Author	Muraoka, Hiroyuki da, Hibiki Uchida, Masaki Ohtsuka, Toshiyuki Koizumi, Hiroshi Nakatsubo, Takayuki
Copyright Year	2007
Abstract	Studies on terrestrial ecosystems in the high Arctic region have focused on the response of these ecosystems to global environmental change and their carbon sequestration capacity in relation to ecosystem function. We report here our study of the photosynthetic characteristics and biomass distribution of the dominant vascular plant species, Salix polaris, Dryas octopetala and Saxifraga oppositifolia, in the high Arctic tundra ecosystem at Ny-Ålesund, Svalbard (78.5°N, 11.5°E). We also estimated net primary production (NPP) along both the successional gradient created by the proglacial chronosequence and the topographical gradient. The light-saturated photosynthesis rate (A max) differed among the species, with approximately 124.1 nmol CO2 g−1leaf s−1 for Sal. polaris, 57.8 for D. octopetala and 24.4 for Sax. oppositifolia, and was highly correlated with the leaf nitrogen (N) content for all three species. The photosynthetic N use efficiency was the highest in Sal. polaris and lowest in Sax. oppositifolia. Distributions of Sal. polaris and D. octopetala were restricted to the area where soil nutrient availability was high, while Sax. oppositifolia was able to establish at the front of a glacier, where nutrient availability is low, but tended to be dominated by other vascular plants in high nutrient areas. The NPP reflected the photosynthetic capacity and biomass distribution in that it increased with the successional status; the contribution of Sal. polaris reached as high as 12-fold that of Sax. oppositifolia.
Starting Page	137
Ending Page	145
Page Count	9
File Format	PDF
ISSN	09189440
Journal	Journal of Plant Research
Volume Number	121
Issue Number	2
e-ISSN	16180860
Language	English
Publisher	Springer Japan
Publisher Date	2008-01-10
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	High Arctic tundra ecosystem Net primary production Photosynthesis Salix polaris Saxifraga oppositifolia Svalbard Plant Biochemistry Plant Physiology Plant Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science

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