TAILIEUCHUNG - Báo cáo khoa học: "Crown architecture in relation to productivity of Populus clones in the Pacific Northwest, U.S.A."

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Crown architecture in relation to productivity of Populus clones in the Pacific Northwest, . | 199s Ann. Sci. For. 1989 46 suppl. 199s-201s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Crown architecture in relation to productivity of Populus clones in the Pacific Northwest . R. Ceulemans1 2 . Hinckley1 . Heilman3 . Isebrands4 and . Stettler1 1 University of Washington College of Forest Resources Seattle WA 98195 . 2 University of Antwerp Department of Biology B-2610 Wilrijk-Antwerp Belgium 3 Western Washington Research and Extension Center Puyallup WA 98371 . and 4 USDA-Forest Service North Central Forest Experiment Station Rhinelander Wl 54501 . Introduction Productivity is intimately related in addition to process-related aspects to crown architecture and canopy density. Therefore it is important to adequately describe and quantifiy different components of crown architecture to better understand and optimize productivity in tree plantations particularly in plantations grown under short-rotation intensive culture SRIC . The present communication briefly summarizes the various crown architectural productivity components that were determined for a number of Populus clones grown under SRIC and reports some preliminary data on leaf area distribution and leaf area density. The relationship between light interception and leaf area of the same clones has been described elsewhere in this volume by Sca-rascia-Mugnozza etal. 1989 . Materials and Methods Twelve different Populus clones were grown at a lx 1 m spacing in a ha plantation established in February 1985 at Puyallup Washington 47 12 N 122 19 W às part of a joint University of Washington Washington State University Poplar Project. Lay-out description and management of the plantation have previously been described Ceulemans et al. 1989 Five of these 12 clones were more intensively studied . 1 Populus deltoides eastern cottonwood clone from IL ỊII-005 2 p. tricho-carpa black cottonwood clones clones 1-12 from Chilliwack . and clone 12-106 from central OR

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