Structural adaptation rather than water conservation was observed in Scots pine over a range of wet to dry climates |
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Authors: | S Palmroth F Berninger E Nikinmaa J Lloyd P Pulkkinen P Hari |
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Institution: | Department of Forest Ecology, P.O. Box 24, FIN-00014 University of Helsinki, Finland e-mail: Sari.Palmroth@Helsinki.fi, Fax: +358-9-1917605, FI Max Planck Institut für Biogeochemie, Postfach 10 01 64, D-07701 Jena, Germany, DE The Foundation of Forest Tree Breeding, Haapastensyrj? Breeding Centre, Karkkilantie 247, FIN-12600 L?yli?inen, Finland, FI
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Abstract: | We investigated the functional and structural responses of Scots pine to climate and estimated the importance of the genotype
on the traits studied. We analysed 13C isotope discrimination (Δ13C) of various provenances in a common garden experiment and gas exchange characteristics for provenances growing in their
natural environment. No clear climatic trend was found in the foliar Δ13C values of common garden trees. Similar results were obtained from estimation of λ (a largely VPD, temperature and light
independent measure of intrinsic water use efficiency) from the gas exchange data. The ratio of needle mass to unit stem area
and branch area to stem area increased towards south in both experiments and hence, seemed to be genetic. Trees from drier
and warmer conditions seemed not to have either lower needle mass or higher intrinsic water use efficiency compared to northern
latitudes.
Received: 6 November 1998 / Accepted: 1 July 1999 |
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Keywords: | Pinus sylvestris Water use efficiency Carbon isotope discrimination Needle mass Pipe model |
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