替代控制对紫茎泽兰的影响

The Effect of Replacement Control on Eupatorium adenophorum

用篾笆遮光模拟不同郁闭度条件下，替代控制对紫茎泽兰营养生长和有性繁殖的影响，结果表明：替代控制对紫茎泽兰的营养生长和有性繁殖均有显著的影响。在不同郁闭度下，紫茎泽兰种籽萌发的实生苗高生长受到明显抑制，平均比对照降低４５．８％；将全光照下生长正常的幼苗植株移入不同郁闭度下时，对其株高生长则有促进作用，平均比对照高５９．８％。前两种情况下，其植株分枝数、平均鲜重、干重、分别比对照减少８１．６％、５２．３％、５５．５％，冠根比比对照增加６４９．６％。

The effect of replacement control on vegetative growth and sexual reproduction of Eupatorium adenophorum has been studied under the condition of various simulated canopy density by controlling sunlight intensity. The results have shown that replacement control has an obvious affect on the vegetative growth and sexual reproduction of Eupatorium adenophorum. The seedling height of Eupatorium adenophorum has been inibited by controlled shade derslty. The average plant height is 45. 8% lower than the contrast. But there is a promotion to the growth of the normal plant under complete sunlight when it is transplanted to different shade density,the average plant height is 59. 8 % higher than the contrastive plant. Compared with the contrastive plant,under the first two conditions the branch number,average fresh weight and average dry weight of Eupatorium adenophorum have decreased by 81. 6% . 52.3%. 55. 5% respectively, and the top root ratio has increased by 649. 6%.