Abstract:

The objective of this study was to reveal the effect of Viola yedoensis plant aqueous extracts and decompositions on the germination, seedling growth of Kentucky bluegrass (Poa pratensis) and Tall fescue (Festuca arundinacea) in petri dishes by adopting indoor bioassay. The results showed that the aqueous extracts from Viola yedoensis had significant inhibition effects on the synthesis effect (SE) of germination and seedling growth of Kentucky bluegrass and Tall fescue, and the inhibition effects were concentration dependent. The decomposed liquid of Viola yedoensis had significant inhibition effect on the SE of germination and seedling growth of Kentucky bluegrass. The decomposed liquid promoted the SE of Tall fescue at low concentrations, whereas inhibited it at high concentrations. The aqueous extracts of Viola yedoensis had stronger inhibition on both Kentucky bluegrass and Tall fescue, and the inhibition effect of Viola yedoensis on Kentucky bluegrass was stronger than the inhibition on Tall fescue. Therefore, Tall fescue should be a preferred species when a new lawn is established in the place having a common weed-Viola yedoensis.

Key words: Viola yedoensis, Kentucky bluegrass, Tall fescue, Allelopathic potential

摘要：

采用室内生物测定法研究紫花地丁(Viola yedoensis)水浸提液、腐解液对草地早熟禾(Poa pratensis)和高羊茅(Festuca arundinacea) 2种草坪草的化感潜力,以初步探讨其化感作用,为杂草地草坪建坪草种选择提供依据.结果表明:紫花地丁水浸提液对2 种草坪草种子萌发和幼苗生长的综合效应有显著抑制作用,且具有浓度效应;腐解液对草地早熟禾种子萌发和幼苗生长的综合效应有显著抑制作用,而对高羊茅种子萌发和幼苗生长的综合效应表现出“低促高抑”的趋势.以水浸提液对草地早熟禾和高羊茅的抑制作用最明显;紫花地丁对草地早熟禾的化感抑制作用大于对高羊茅的抑制作用.高羊茅比草地早熟禾适合在紫花地丁为主要杂草的土地建坪.

关键词: 紫花地丁, 早熟禾, 高羊茅, 化感潜力