tailieunhanh - Báo cáo lâm nghiệp: "How the absolute growth rate of poplar adapts to the light-NO -dosage 3 G.A. Pieter"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: How the absolute growth rate of poplar adapts to the light-NO -dosage 3 . Pieters. | 673s Ann. Sci. For. 1989 46 suppl. 673s-679s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA How the absolute growth rate of poplar adapts to the light-NOg-dosage . Pieters Department of Plant Physiological Research. Agricultural University. Gen. Foulkesweg 72. 6703 BW Wageningen The Netherlands Introduction The growth of leaves and internodes on a branch of poplar grown under constant conditions proceeds according to growth patterns which 1 can be defined as organ-specific relations between the relative growth rate RGR and the age of the organ and 2 are independent of irradiance. Consequently the absolute growth rate of such a branch cannot adapt to irradiance via these growth patterns. A poplar plant adapts its absolute growth rate to high irradiance by a gradually faster production of proportionally larger primordia at its apex. At the same time the apical volume and the phyllotactic order are increasing. It could be shown that the apical volume is proportional to the rate of leaf area production Pieters and van den Noort 1988 . Under optimal conditions the stem elongation rate increases proportionally to the leaf production rate and on the average this results in internodes with constant mature length. Larson 1975 analyzed the development of the vascular system of poplar. The number and the length of the vascular bundles in the vascular cylinder increase in a systematic way at the same time phyllotactic order increases. According to Larson s analyses new procambial traces develop long before the primordia they will serve are visible at the apex. Combining Larson s data with ours we established a striking correspondence between the development of the vascular system of poplar the growth of the organs and the development of absolute growth rate of the plant. Adaptation proceeds via enlargement of the primary vascular system Pieters and van den Noort 1988 . A larger vascular system is reflected in a larger apical volume and produces proportionally .

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp