对经过不同剥皮量(50%、75%和100%)处理后116 d内杜仲(Eucommia ulmoides Oliv.)叶片的超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)活性及树干地径和树干直径的变化进行了分析比较。结果表明,经过剥皮处理后,杜仲叶片的SOD、CAT和POD酶活性均高于对照,不同酶活性的峰值随剥皮量的不同而有差异,其中剥皮量为100%的杜仲叶片3种酶活性的峰值最高;在116 d的生长期内,杜仲叶片3种酶的活性均在剥皮后14 d内达到最高值,在实验末期接近对照水平;不同剥皮量对杜仲树干的地径和直径均有一定的影响,其中75%和50%的剥皮量对树干地径和树干直径生长的影响较小。研究结果说明,剥皮处理对杜仲植株有一定程度的伤害,但经过一定时期的生长,这种伤害能得到修复;在实际生产中对杜仲树干采用75%剥皮量,可以达到经济效益最大化和保护杜仲资源的双重目的。

Activities of SOD, CAT and POD in leaf and changes of ground diameter and trunk diameter of Eucommia ulmoides Oliv. in 116 days after trunk girdled (50%, 75%and 100%girdling amount)were analyzed. The results show that activities of SOD, CAT and POD in leaf of the girdled trees of E. ulmoides are higher than that of the control group, and the peak values of enzyme activity of different treatment groups are various with different girdling amounts, and the peak value of the three enzyme activities in the treatment group of 100% girdling amount of E. ulmoidesis the highest. During the growth period (116d) after girdled, the activities of the three enzymes in E. ulmoides leaf all reach peak valueat 14d, and decline to the level of the control group at the end of experiment. The different girdling amounts also have some effects on the ground diameter and trunk diameter of E. ulmoides tree, in which the effects of 75% and 50% girdling amount are smaller. It is concluded that girdling treatment does injury to E. ulmoides in some degree, but after growth of a certain period, the injury will be repaired. In practical production, using 75% girdling amount to E. ulmoides is a optimal  measure, which can achieve the purpose of maximizing economic benefit and protecting E. ulmoides resources.