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

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Báo cáo khoa học: "Crown architecture in relation to productivity of Populus clones in the Pacific Northwest, U.S.A."Crown architecture in relation to productivityof Populus clones in the Pacific Northwest, U.S.A. 1 Hinckley J.G. IsebrandsR. Ceulemans T.M. P.E. Heilman R.F. 1tettlerand R.F. Stettle! University of Washington, College of Forest Resources, Seattle, WA 98195, U.S.A.,2 University of Antwerp, Department of Biology, B-2610 Wilrijk-Antwerp, Belgium,3 Western Washington Research and Extension Center, Puyallup, WA 98371, U.S.A., and4 USDA-Forest Service, North Central Forest Experiment Station, Rhinelander, WI 54501, U.S.A. Materials and MethodsIntroduction Twelve different Populus clones were grown atProductivity is intimately related, in addi- a 1 x 1 m spacing in a 0.36 ha plantation, esta-tion to process-related aspects, to crown blished in February 1985 at Puyallup, Washing-architecture and canopy density. There- ton (47°12’ N, 122°19’ W), as part of a jointfore, it is important to adequately describe University of Washington/Washington State University Poplar Project. Lay-out, descriptionand quantifiy different components of management of the plantation have pre- and architecture to better understandcrown viously been described (Ceulemans et al.,and optimize productivity in tree planta- 1 s8s).tions, particularly in plantations grown intensive- Five of these 12 clones were more ly studied, i.e., 1 Populus deltoides (easternunder short-rotation intensive culture cottonwood) clone from IL (III-005), 2 P. tricho-(SRIC). The present communication brief- carpa (black cottonwood) clones (clones 1-12ly summarizes the various crown architec- from Chilliwack, B.C., and clone 12-106 fromtural productivity components that were OR) and 2 hybrid clones between both central species, clones 11-11 and 44-136, obtained bydetermined for a number of Populus Heilman and Stettler (1985).clones, grown under SRIC, and reports Besides growth and productivity, differentsome preliminary data on leaf area distri- physiological, morphological and structuralbution and leaf area density. The relation- characteristics were studied during the first 3 (of a total of 4) yr of the experimental field planta-ship between light interception and leaf tion. At the beginning (May-June), middlearea of the same clones has been de- (July-August) and end (September-October) ofscribed elsewhere in this volume by Sca- the third growing season (1987), detailed infor- mation on branching patterns and branchrascia-Mugnozza et al. (1989).* correspondence to Antwerp, Belgiurr12.* address allPlease . 2 Belgium Please Results and Discussioncharacteristics was collected on representativetrees of each of the 5 clones. Number ofbranches, branch length and diameter, and theangles of origin and termination were deter- clor!al differences in number of Significantmined for both proleptic and first-order syllepticbranches. All branches on a given year’s height branches, branch length and diameter,growth increment (HGI) were counted and mea- and branch angles caused striking ...