TAILIEUCHUNG - Báo cáo khao học: "High-resolution analysis of radial growth and wood density in Eucalyptus nitens, grown under different irrigation regimes"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: High-resolution analysis of radial growth and wood density in Eucalyptus nitens, grown under different irrigation regimes. | Ann. For. Sci. 59 2002 519-524 INRA EDP Sciences 2002 DOI forest 2002036 519 Original article High-resolution analysis of radial growth and wood density in Eucalyptus nitens grown under different irrigation regimes Rupert Wimmera Geoffrey M. Downesb and Robert Evansc aUniversitat fur Bodenkultur Wien Institute of Botany Gregor Mendelstrasse 33 1180 Vienna Austria bCSIRO Forestry and Forest Products GPO Box 252-12 Hobart TAS 7001 Australia c CSIRO Forestry and Forest Products Private Bag 10 Clayton South MDC VIC 3169 Australia Received 5 July 2001 accepted 11 February 2002 Abstract - Wood density is the most important determinant of wood quality and a critical factor in short rotation forestry. Daily radial growth of six-year-old Eucalyptus nitens trees were monitored on a two hectare plantation in south-eastern Tasmania using point dendrometers under different irrigation regimes. At the end of the second growing season 12-mm cores were extracted from the trees and processed for high-resolution wood density using SilviScan-2. The dendrometer measurements were utilized to rescale wood density on a time axis. In general lower density was formed early in the growing season and higher wood density later. The irrigated-droughted trees showed an obvious relationship between wood density and soil water deficits with the density decreasing in response to water stress releases. The density decrease was accompanied by acceleration in daily increment. With the presented approach the annual level is no longer the basis of analysis. This opens new opportunities for genotype X environmental interaction studies of trees which is of particular importance in clonal forestry. wood density dendrometer wood quality irrigation cambium Résumé - Analyse haute resolution de la croissance radiale et de la densité du bois d Eucalyptus nitens croissant sous divers regimes d irrigation. La densité du bois est le plus important determinant de la qualité du bois et un facteur critique .

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