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在干旱条件下对油松、侧柏、刺槐人工林进行不同水平灌水试验，结果表明：1.O倍降水量的补充灌水对三种树木的生长最有利，直径和高生长最快。油松和侧柏的年材积增长量分别为对照的2.9倍和1.6倍，每年每公顷可分别盈利575元和2566元，经济效益显著。
The results showed that supplemental irrigation with 1.O times of precipitation was most beneficial to the growth of three kinds of trees, with the fastest diameter and height growth under different drought conditions. The annual volume increment of Pinus tabulaeformis and Platycladus orientalis were 2.9 times and 1.6 times that of the control respectively, and the profit was 575 yuan and 2566 yuan per hectare each year respectively, which had significant economic benefits.