title: Age-dependent climate-growth relationships and regeneration ofPicea abiesin a drought-prone mixed coniferous forest in the Alps.
abstract: Within dry inner Alpine environments climate warming is expected to affect the development of forest ecosystems by changing species composition and inducing shifts in forest distribution. By applying dendroecological techniques we evaluated climate sensitivity of radial growth and establishment ofPicea abiesin a drought-prone mixed-coniferous forest in the Austrian Alps. Time series of annual increments were developed from > 220 trees and assigned to four age classes. While radial growth of oldP. abiestrees (mean age 121 and 174 yr) responded highly significant to May-June precipitation, young trees (mean age 28 and 53 yr) were insensitive to precipitation in the current year. Because tree age was closely correlated to height and diameter (r2= 0.709 and 0.784, respectively), we relate our findings to the increase in tree size rather than ageper se. Synchronicity found among trend in basal area increment and tree establishment suggests that canopy openings increased light and water availability, which favoured growth and establishment of moderately shade-tolerantP. abies. We conclude that althoughP. abiesis able to regenerate at this drought prone site, increasing inter-tree competition for water in dense stands gradually lowers competitive strength and restricts scattered occurrence to dry-mesic sites.
authors.affiliation: Leopold-Franzens-University of Innsbruck, Institute of Botany, Sternwartestrasse 15, A-6020 Innsbruck, Austria.
authors.forename: Roman
authors.initials: R
authors.lastname: Schuster
authors.forename: Walter
authors.initials: W
authors.lastname: Oberhuber
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