白洋淀荷茎叶提取液对铜绿微囊藻及四尾栅藻化感效应

本研究探讨了活体荷不同部位(茎和叶)提取出液对铜绿微囊藻、四尾栅藻生长化感效应,为推广荷遏制水华暴发及制作抑藻制剂提供理论基础.实验设计了5个浓度梯度,结果表明,荷叶浸出液对藻类的抑制效果优于荷茎浸出液,当荷叶浸出质量浓度为25 g.L-1时,对铜绿微囊藻及四尾栅藻的抑制率分别为71.33%、78.14%.浸出液成分的GC-MS分析表明,荷叶和茎浸出液都含有丙酰胺,质量浓度分别为1.1 mg.L-1、0.2 mg.L-1.并根据概率计算法,分别计算了两种藻类的半浓度效应.

Allelopathic Effect of Nelumbo nucifera Stem and Leaf Tissue Extract on the Growth of Microcystis aeruginosa and Scenedesmus quadricanda

Effects of Nelumbo nucifera stem and leaf tissue extract on the growth of Microcystis aeruginosa and Scenedesmus quadricanda were studied to verify its potential in entriphication control. Five concentrations of Nelumbo nucifera stem and leaf tissue extract were chosen to compare their inhibitory effects on the growth of Microcystis aeruginosa and Scenedesmus quadricanda. The result showed that the leaf extract inhibited the algae bloom more effectively than the stem extract on the whole. When the leaf extract normality was 25 g·L^-1, the highest inhibition rate of Microcystis aeruginosa and Scenedesmus quadricanda was 71.33% and 78.14%, respectively, while for the stem extract, the values were 49.78% and 52.14%. Propanamide was found in both the stem and leaf tissue extracts of Nelumbo nucifera by GC-MS analysis, with concentrations of 1.1 mg·L^-1 and 0.2 mg·L^-1, respectively. The EC₅₀ values of the two kinds of algae were calculated by the probability method.