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Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Dynamics of light interception, leaf area and biomass production in the establishment year in Populus clones. | 515s Ann. Sci. For. 1989 46 suppl. 515s-518s Forest Tree Physiology E. Dreyer ef al. eds. Elsevier INRA Dynamics of light interception leaf area and biomass production in Populus clones in the establishment year G.E. Scarascia-Mugnozza1 2 J.G. lsebrands1Ạ T.M. Hinckley1 and R.F. Stettler1 1 Colle ge of Forest Resources University of Washington Seattle W4 98195 U.S.A. 2 Institute of Forest Biology University of Tuscia 01100 Viterbo Italy and 3 Forestry Sciences Laboratory USDA-Forest Service Rhinelander Wl 54501 U.S.A. Introduction Biomass production in agricultural crops is directly related to the radiant energy interception by foliage Monteith 1981 . Linder 1985 demonstrated that a linear relationship between solar radiation capture and biomass production also exists for forest stands. However variability in canopy architecture among plant genotypes could strongly influence the efficiency of conversion of solar energy into biomass production. In this study we characterized this relationship between light interception and biomass growth on 4 very different Populus clones during the establishment year. Materials and Methods In February 1985 a 1 x1 m plantation was established in Puyallup WA U.S.A. with unrooted 25 cm hardwood cuttings of 4 poplar clones including 2 hybrids p trichocarpa X p deltoides 11-11 and 44-136 and a clone of each of the parental species p. trichocarpa 112 and p. deltoides HI-5 . Growing conditions were near optimal with periodic fertilization and irrigation. Monthly biomass and leaf area measurements were collected from whole-tree harvests of 4-6 trees per clone. Light interception was recorded with a quantum sensor located above the canopy and a quantum line sensor on the ground below the canopy connected to integrators. The location of the line sensor was randomly changed every week among permanent growth plots of the 4 clones. Results Light interception of the clones increased throughout the growing season until a maximum value of 95 clone
