几种热带相思树种的扦插育苗试验

几种热带相思树种经大田扦插育苗试验结果表明：在广州地区以秋季进行萌条扦插育苗效果较好。以马占相思、直干大叶相思、厚荚相思萌条作插穗，用１／３火烧土加２／３黄心土作基质，蘸上自配的ＩＢＤ２＃多效生根粉，直接插入育苗容器育苗，苗床用塑料薄膜拱棚加盖遮光度为６０％的黑网以调节控制温湿度及光照，在基质和插穗不消毒、定期淋浇１‰的复合肥水的情况下，扦插成活率分别达６１．８％、８８．８％和６８．９％。其中直干大叶相思扦插易成活且受季节影响较小。

Cutting Propagation of Some Tropical Species of Acacia

The cutting propagation of three tropical species of Acacia, A. mangium,A. auriculiformis,A. crassicarpa ,have been tested in the field. It shows that autumn is the best season for their vegetative propagation in Guangzhou. The cuttings of them treated with rooting power,IBD 2 #,can be directly put into plastic bag filled with the mixed medium of 1/3 burning earth and 2/3 deep yellow soil. In order to control temperature,humidity and sunshine,the bed must be surrounded with plastic film and shaded by sunshade net(60 percent).61.8%, 88.8% and 68.9% of the cuttings survival rate for A.mangium,A.auriculiformis and A. crassicarpa can be raised to. For A.auriculiformis ,it is easier to propagate by cutting than the others,and there is less difference of rooting by season changing.