田间供水与杨树生长关系的研究——Ⅰ.供水处理对杨树生长、树体结构和叶量的影响

在集约栽培的杨树人工林中作了小区灌溉试验,进行了林木生长指标、水分生理指标与供水量关系的研究。结果表明,供水大大促进了林木生长,其树高、胸径和材积的年增长量均随供水量的提高而增加。1983—1986年其树高、胸径、材积分别比对照增加 17.2—24.6％、10.7—22.1％和22.0—42.6％。供水还影响到树体的结构,有利于同化产物向枝条中运输与积累,促进了树干、枝条、叶数与叶面积的增长。

STUDIES ON RELATIONSHIP BETWEEN WATER SUPPLY AND GROWTH IN A POPLAR PLANTATION I. THE EFFECT OF WATER SUPPLY ON GROWTH, ARCHITECTURE AND LEAF QUANTITY OF TREE

An irrigation experiment was conducted in an intensively cultivated poplar plantation (Populus dcltoidrs Bartr. cv. "Lux" ex. I-G9/55) in 1983-1986. The relationship between the indices of tree growth, water physiological indices and water supply in the field was studied. The results reveal that artificial water supply can greatly promote the growth of tree. In comparision with the control (rainfall only) the average height, D. B. H. and volume increment increased by 17.2-24.6%, 10.7-22.1% and 22.0-42.6% respectively under irrigation. Water supply has a great influence upon the structure of tree, increasing dry weight of stem and branch, leaf number and leaf area, favouring the accumulation of assimilation and it's transport to branch. The enlargement of leaf area of crown promotes the increase of volume increment.