入侵植物红花酢浆草对3种杂草的化感作用

Allelopathy of invasive plant Oxalis corymbosa DC on three weeds

化感作用在生物入侵过程中扮演着重要的角色。以红花酢浆草(Oxalis corymbosa DC)为供体植物,以黑麦草(Lolium perenne L.)、三叶鬼针草(Bidens pilosa L.)和青葙(Celosia argentea L.)为受体,采用培养皿滤纸法测定了红花酢浆草的根、茎和叶的水提液对受体植物幼苗根长、苗高和鲜重的化感作用。结果表明,红花酢浆草根、茎和叶的提取液对3种受体植物种子萌发和幼苗生长均有化感作用,不同浓度(0.05、0.10、0.20 g/m L)的水提液对黑麦草、三叶鬼针草和青葙的化感作用强度存在差异,且随着浓度的增大,抑制作用逐渐增强。

Allelopathy plays an important role in biological invasion. In this study, the invasive plant Oxalis corymbosa DC was used as donor plant, Lolium perenne L., Bidens pilosa L. and Celosia argentea L. were used for receivers, petri dishes with filter paper were used to examine allelopathic effects of aqueous leachates of the roots, stems and leaves of O. corymbosca The results showed that aqueous leachates of the roots, stems and leaves inhibited seed germination and seedling growth of all the three weed species. The inhibitmy effect increased with of the concentration aqueous leachates from 0.05 g/mL to 0.20 g/mL.