假苍耳不同部位水浸提液对5种土著植物化感作用的研究

为探究外来植物假苍耳对土著植物种子萌发和幼苗生长是否存在化感作用,分别利用其水浸提液处理5种土著植物种子。结果显示,假苍耳不同部位浸提液存在不同程度化感作用,且其不同部位化感作用强度不同,叶浸提液抑制作用最强。从叶中分离出的3种组分中中性组分化感效应强于酸性和碱性组分。不同的土著植物对假苍耳同一部位浸提液敏感程度也不同,狗尾草和苋种子萌发对假苍耳不同部位浸提液均表现敏感,大籽蒿、藜、稗对假苍耳不同部位浸提液则表现出低促高抑的趋势。

A study of the allelopathic effect of extracts from different parts of Iva xanthiifolia on five native species

This research explored the allelopathic effects of extracts of the exotic plant Iva xanthiifolia on seed germination and seedling growth of native plants. Seeds of five native plant species were treated with water extracts of the plant. The extracts from different parts of I. xanthiifolia had different allelopathic effects, with the suppression effect of leaf extract being the strongest. Among the acid, alkaline and neutral components isolated from leaves, the allelopathic effect of the neutral group was stronger than that of the acid and alkaline components. The sensitivity of different native plants treated with the same extract of I. xanthiifolia was also different. The seed germination and seedling growth of Setaria viridis and Amaranthus tricolor were sensitive to the extracts from different parts of I. xanthiifolia. Low concentration of the extract promoted the growth of Artemisia sieversiana, Echinochloa crusgalli and Chenopodium album, while a high concentration of the extract inhibited the growth of the same three species.