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An alpine treeline ...
An alpine treeline in a carbon dioxide-rich world : synthesis of a nine-year free-air carbon dioxide enrichment study
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- Dawes, Melissa A. (author)
- Mountain Ecosystems, WSL Institute for Snow and Avalanche Research-SLF, Davos Dorf, Switzerland
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- Hagedorn, Frank (author)
- Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf, Switzerland
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- Handa, Ira Tanya (author)
- Université du Québec à Montréal (UQÀM), Montreal, Canada
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- Streit, Kathrin (author)
- Paul Scherrer Institute, Villigen, Switzerland
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- Ekblad, Alf (author)
- Örebro universitet,Institutionen för naturvetenskap och teknik
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- Rixen, Christian (author)
- Mountain Ecosystems, WSL Institute for Snow and Avalanche Research-SLF, Davos Dorf, Switzerland
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- Körner, Christian (author)
- University of Basel, Basel, Switzerland
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- Hättenschwiler, Stephan (author)
- Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Montpellier, France
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(creator_code:org_t)
- 2013-01-23
- 2013
- English.
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In: Oecologia. - : Springer Science and Business Media LLC. - 0029-8549 .- 1432-1939. ; 171:3, s. 623-637
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https://doi.org/10.1...
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Abstract
Subject headings
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- We evaluated the impacts of elevated CO2 in a treeline ecosystem in the Swiss Alps in a 9-year free-air CO2 enrichment (FACE) study. We present new data and synthesize plant and soil results from the entire experimental period. Light-saturated photosynthesis (A max) of ca. 35-year-old Larix decidua and Pinus uncinata was stimulated by elevated CO2 throughout the experiment. Slight down-regulation of photosynthesis in Pinus was consistent with starch accumulation in needle tissue. Above-ground growth responses differed between tree species, with a 33 % mean annual stimulation in Larix but no response in Pinus. Species-specific CO2 responses also occurred for abundant dwarf shrub species in the understorey, where Vaccinium myrtillus showed a sustained shoot growth enhancement (+11 %) that was not apparent for Vaccinium gaultherioides or Empetrum hermaphroditum. Below ground, CO2 enrichment did not stimulate fine root or mycorrhizal mycelium growth, but increased CO2 effluxes from the soil (+24 %) indicated that enhanced C assimilation was partially offset by greater respiratory losses. The dissolved organic C (DOC) concentration in soil solutions was consistently higher under elevated CO2 (+14 %), suggesting accelerated soil organic matter turnover. CO2 enrichment hardly affected the C–N balance in plants and soil, with unaltered soil total or mineral N concentrations and little impact on plant leaf N concentration or the stable N isotope ratio. Sustained differences in plant species growth responses suggest future shifts in species composition with atmospheric change. Consistently increased C fixation, soil respiration and DOC production over 9 years of CO2 enrichment provide clear evidence for accelerated C cycling with no apparent consequences on the N cycle in this treeline ecosystem.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Keyword
- Carbon cycling
- Dwarf shrub
- Global change
- Nitrogen
- Treeline conifer
Publication and Content Type
- ref (subject category)
- art (subject category)
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