紫花苜蓿对九种杂草的化感作用

试验运用生物测定法研究了紫花苜蓿叶化感物质对九种受体植物的作用.结果表明,紫花苜蓿叶提取物对多变小冠花的发芽势和发芽率具有抑制作用,与对照差异显著(P＜0.05);提取物对高羊茅种子的发芽势有促进作用,与对照差异显著(P＜0.05),其最终发芽率也增加(P＜0.05);除狗尾草外,其余八种受体植物的胚根长度都受到紫花苜蓿叶提取物的抑制,与对照的差异均显著(P＜0.05);提取物对稗草、狗尾草、高羊茅、毛马唐和多变小冠花的苗长具有促进作用,与对照差异均显著(P＜0.05);反枝苋的苗长则受到抑制(P＜0.05);提取物对受体植物的幼苗鲜重均有不同程度的影响,虎尾草、匍匐翦股颖、巴哈雀稗、反枝苋和多变小冠花幼苗鲜重明显降低,与对照差异达显著水平(P＜0.05).

Effect of Alfalfa Allelopathic Compounds on Nine Weeds

The objective of this research is to determine the effect of alfalfa allelopathic compounds on several recipient plants by bioassay.The results indicated that the germination capacity and germination percentage of crown vetch was inhibited(P<0.05),while the germination of tall fescue was hastened instead(P<0.05).The radicle lengths of 8 recipient plants were inhibited by alfalfa leaf extract(P<0.05),except for green bristle grass.The leaf extract promoted the seedling growth of 5 plants(P<0.05),including barnyard grass,green bristle grass,tall fescue,hairy crabgrass and crown vetch,only redroot amaranth was inhibited by the extract.Alfalfa leaf extract effeced the fresh weight of showy chloris,stolon-bearing bent grass,bahia grass,redroot amaranth and crown vetch,they were lighter than control(P<0.05).