Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Comparative growth analysis of five first year establishment poplar clones (Populus sp.) grown under a short-rotation intensive culture system. | 250s Ann. Sci. For. 1989 46 suppl. 25ŨS-255S Forest Tree Physiology E. Dreyer etal. eds. Elsevier INRA Comparative growth analysis of five first year establishment poplar clones Populus sp. grown under a short-rotation intensive culture system F. Mau and I. Impens Laboratory of Planty Ecology Department of Biology University of Antwerp Universiteitsplein 1 2610 Wilrijk Belgium Introduction Interest in fast growing poplar clones for maximum production in short-rotation intensive culture is obvious. Clones from Aigeiros and Tacamahaca sections are well suited for short-rotation intensive culture because of their rapid juvenile growth. Fig-1-. Mean tree height cm of 8 model trees for 5 clones ROB Robusta FRI Fritzi Pauley COL Columbia River BEA Beaupré RAS Raspalje increasing with date Julian date 1 Jan. 1 1987 . 251s 1S0 200 220 240 260 280 300 ROB FRI JULIAN DATE 0 COL A BEA X RAS Fig. 2. Mean stem diameter mm of 8 model trees for 5 clones see legend to Fig. 1 increasing with date Julian date 1 Jan. . 100 140 180 220 260 300 340 ROB FRI JULIAN DATE 0 COL A BEA X RAS Fig. 3. Mean leaf area development tree according to date Julian date 1 Jan. 1 1987 of 8 model trees for 5 clones see legend to Fig. 1 . 252s Fast starter clones are most suited for a 1-3 yr old coppice stand rotation according to Zsuffa 1979 . Superior hybrid growth was indicated as a factor responsible for the good performance of hybrid poplar in comparison with mere species clones Cain and Ormrod 1984 . Materials and Methods Five poplar clones p. X euramericana cv. Robusta p. trichocarpa cv. Fritzi Pauley p. tri-chocarpa cv. Columbia River p. trìchocarpa X p. deltoides cv. Beaupre p. trichocarpa X p. deltoides cv. Raspalje were grown from cuttings planted in a 0 80 X m pattern at Afsnee 51 02 N 3 39 E Belgium in 1987. The trees were well irrigated fertilized and the plots kept free of weeds. Table I. Mean leaf area duration of 8 model trees in days for 5 clones ROB Robusta FRI Fritzl .
