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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。
In intensive cultivation of poplar plantations in a district irrigation experiments were made, the tree growth index, water physiological indicators and the relationship between water supply. The results showed that water supply greatly promoted the growth of trees, and the annual increment of tree height, DBH and volume increased with the increase of water supply. From 1983 to 1986, the tree height, DBH and volume increased by 17.2-24.6%, 10.7-22.1% and 22.0-42.6% respectively compared with the control. Water supply also affects the structure of the tree body, which facilitates the transport and accumulation of assimilate products into shoots and promotes the growth of trunk, branches, leaves and leaf area.