2种陆生植物浸提液对四尾栅藻的化感作用

通过合果芋（Syngonium podophyllum）和榕树（Ficus microcarpa）2种陆生植物不同质量浓度、不同部位浸提液对四尾栅藻（Scenedesmus quadricauda）化感作用的研究,结果表明：合果芋叶和茎浸提液对四尾栅藻表现出促进作用,仅浸提液高质量浓度（50 g.L^-1）处理组分别在实验前3 d和1 d表现出微弱的抑制作用.合果芋叶浸提液对四尾栅藻的促进作用强于茎浸提液.除浸提液30 g.L-1处理组第2 d之外,各质量浓度的榕树叶浸提液作用下的四尾栅藻密度均低于对照组,显示了较强的抑制作用.与榕树叶浸提液对四尾栅藻化感作用相似,榕树气生根浸提液对四尾栅藻显示了一定的抑制作用,且随投加浸提液质量浓度的升高对四尾栅藻的抑制作用增强.榕树叶和气生根浸提液对四尾栅藻的EC50,96 h值分别为11.17和47.97 g.L^-1,榕树叶浸提液对四尾栅藻的抑制效果好于榕树气生根浸提液.

Allelopathy of two kinds of terraneous plant extracts on Scenedesmus quadricauda

Allelopathy of two kinds of terraneous plant extracts with different concentrations and different parts on Scenedesmus quadricauda was studied in this paper.The results showed that leaf and stem extracts of Syngonium podophyllum had promotive effects on Scenedesmus quadricauda.Only treatment group of high concentration（50 g·L-1） showed slightly inhibitory effect in the 1st day and 3rd day,separately.Besides,the allelopathy of leaf extract was stronger than that of stem extract.In contrast,leaf extract of Ficus microcarpa showed fairly stronger inhibitory effect.Except the treatment group of 30 g·L-1 in the 2nd day,the densities of Scenedesmus quadricauda in treatment groups of leaf extract with different concentrations were all lower than the controlling group,which had no extract.Similar to leaf extract of Ficus microcarpa,its aerial root extract also showed some inhibitory effect on Scenedesmus quadricauda and the effect became stronger with the rising extract concentration.In addition,the leaf extract had stronger inhibitory effect than its aerial root extract.EC50,96 h values of leaf and aerial root extract were,respectively,11.17g·L^-1 and 47.97 g·L^-1.