TAILIEUCHUNG - Báo cáo lâm nghiệp: "Effects of microsite on growth of Pinus cembra in the subalpine zone of the Austrian Alps"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Effects of microsite on growth of Pinus cembra in the subalpine zone of the Austrian Alps. | Ann. For. Sci. 61 2004 319-325 INRA EDP Sciences 2004 DOI forest 2004025 319 Original article Effects of microsite on growth of Pinus cembra in the subalpine zone of the Austrian Alps Mai-He LIa b Jian YANGc a Institute for Forest and Mountain Risk Engineering Vienna University of Agricultural Sciences Peter Jordan-Strasse 82 1190 Vienna Austria b Current address WSL Swiss Federal Institute for Forest Snow and Landscape Research Zuercherstrasse 111 8903 Birmensdorf Switzerland c Applied Environmental Geoscience University of Tubingen Sigwart Strasse 10 72076 Tubingen Germany Received 7 March 2003 accepted 20 August 2003 Abstract - We examined growth in Pinus cembra L. 28 years old across the treeline ecotone from 1900 to 2100 m elevation in the Alps. Eighteen plots were chosen at different microsites which are defined as a combination of elevation and steepness gentle vs. steep slope on a south-facing slope in the Schmirn Valley Tyrol Austria. Over the range of altitudes studied elevation and steepness had influences on growth depending on tree size 1 Elevation and steepness had little effect on growth as long as trees were very small m in height 2 Both elevation and steepness affected tree growth significantly when the tree height was between and 3 m 3 As trees exceeded 3 m in height tree canopies fully covered the ground surface and created a forest microclimate causing growth to decline with increasing elevation irrespective of steepness. We conclude that the microsite related to microclimate controls growth during the early life stages of trees but following canopy closure the local climate mesoclimate associated with topography begins to determine tree growth. growth responses high altitude micro-environmental conditions tree ecology treeline ecotone Résumé - Effets de la microstation sur la croissance de Pinus cembra dans la zone subalpine des Alpes autrichiennes. Nous avons examine la croissance de Pinus cembra L. 28 ans dans l ecotone de la

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