两种含羞草科入侵植物的化感作用初探

Allelopathy of Two Kinds of Invasive Plants in Mimosaceae

以白菜、萝卜、莴苣为受体,以华南地区含羞草科入侵植物含羞草和金合欢的水浸液为供体,应用室内生物测定方法,研究供体植物对3种作物种子萌发与幼苗生长的影响。结果表明,含羞草和金合欢水浸液对白菜、萝卜和莴苣种子萌发和幼苗生长存在不同程度的抑制作用,且这种抑制作用随着浓度的增加而增强,当水浸液浓度为0.20 g.mL-1时,各项指标均达到显著水平(P<0.05);比较两种供体植物对3种作物的综合化感效应指数,金合欢明显高于含羞草;对两种供体植物水浸液的定性鉴定显示,均含有酚类化感物质。

Effects of Mimosa pudica L. and Acacia farnesiana L. aqueous extracts on the three crops＇s seed germination and seedling growth were determinated by laboratory bioassay method, such as eabbage（Brassica campestris L. ）, Radish（Raphanus sativus L. ） and lettuce（Lactuca sativa L. ） . The results showed that the seed germination and seedling growth of three crops were inhibited in various degrees, and the allelopathic inhibitory effects strenghthened as the mass concentration of aqueous extract increasing, physiological indexes were significantly different （P〈0.05） when concentration of aqueous extractss was increased to 0.20 g.mL^-1 , the synthetical allelopathic index of A. farnesiana was higher than the index of M. pudica. The identification test had proven that some phenolic allelochemicals existed in the aqueous extracts of M. pudica and A. farnesiana.