三叶鬼针草水浸提液对两种暖季型草坪草种子萌发和幼苗生长的影响

Effect of Bidens pilosa Extracts on Germination and Seedling Growth of Two Kinds of Warm-Season Turfgrass

摘要: 采用培养皿滤纸法研究不同浓度的三叶鬼针草水浸提液对地毯草和细叶结缕草种子萌发和幼苗生长的化感作用。实验结果表明，三叶鬼针草水浸提液在0.0625 g/ml浓度下对地毯草和细叶结缕草种子的发芽率、发芽势以及发芽指数具有促进作用，其他浓度下均表现为抑制作用；对地毯草和细叶结缕草种子活力指数以及其幼苗的根长随着浓度的增加抑制作用增强；三叶鬼针草水浸提液在0.0625 g/ml和0.125 g/ml的浓度下对地毯草幼苗的苗高表现为促进作用，而其他浓度下表现为抑制作用；仅在0.125 g/ml处理下对细叶结缕草幼苗的苗高表现为促进作用。说明入侵植物三叶鬼针草水浸提液对地毯草和细叶结缕草这两种暖季型草坪草具有化感作用，抑制了其种子的萌发和幼苗的生长。

Abstract: Dish-dipping method was conducted to explore the allelopathic effects of different concentrations’ aquatic lixivium and extracts from Bidens pilosa on the seed germination and early seedling growth of Axonopus compressus and Zoysia tenuifolia. The result showed that the aqueous extracts of Biden spilosa at 0.0625 g/ml concentration had some facilitating effect on germination rate, germination potential and germination index, whereas its effect was not significant occasionally at the others concentration or even inhibited action to them. With the increase of concentrations of the aquatic Bidens pilosa, the aqueous extracts of Bidens pilosa could inhibit on vital index and the root length of the Axonopus compressus and Zoysia tenuifolia. The aqueous extracts of Bidens pilosa at 0.0625 g/ml and 0.125 g/ml concentrations had some facilitating effect on height of Zoysia tenuifolia’s seedling, whereas its effect was inhibited action to it at the others concentration. Only at 0.125 g/ml concentrations the aqueous extracts of Bidens pilosa had facilitating effect on the Carpet’s seedling height. So the aqueous extracts of Bidens pilosa had allelopathic effect on the two kinds of warm-season turfgrass.