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Variation of mobile carbon reserves in trees at the alpine treeline ecotone is under environmental control

Fajardo, Alex and Piper, Frida I. and Pfund, Laura and Körner, Chiristian and Hoch, Günter. (2012) Variation of mobile carbon reserves in trees at the alpine treeline ecotone is under environmental control. New phytologist, Vol. 195, H. 4. pp. 794-802.

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Official URL: http://edoc.unibas.ch/dok/A6070504

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Abstract

In low temperature-adapted plants, including treeline trees, light-saturated photosynthesis is considerably less sensitive to temperature than growth. As a consequence, all plants tested so far show increased nonstructural carbohydrate (NSC) tissue concentrations when exposed to low temperatures. Reduced carbon supply is thus an unlikely cause for low temperature range limits of plants. For altitudinal treeline trees there is, however, a possibility that high NSC genotypes have been selected. • Here,weexploredthispossibilityusingafforestationswithsingle-provenanceconifersalong elevational gradients in the Southern Chilean Andes and the Swiss Alps. • Tree growth was measured at each of four approximately equidistant elevations at and below the treeline. Additionally, at the same elevations, needle, branch and stem sapwood tis- sues were collected to determine NSC concentrations. • Overall, growth decreased and NSC concentrations increased with elevation. Along with previous empirical and experimental studies, the findings of this study provide no indication of NSC reduction at the treeline; NSC increased in most species (each represented by one com- mon population) towards their upper climatic limit. The disparity between carbon acquisition and structural carbon investment at low temperature (accumulation of NSC) thus does occur even among genotypes not adapted to treeline environments.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Pflanzenökologie (Körner)
UniBasel Contributors:Hoch, Günter and Körner, Christian
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Blackwell Science
ISSN:0028-646X
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:01 Mar 2013 11:13
Deposited On:01 Mar 2013 11:09

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