旱伞草与粉绿狐尾藻立体复合的抑藻效能

Allelopathic effects of Cyperus alternifoliusand Myriophyllum aquaticum on phytoplankton

摘要:

为考察植物间组合的化感抑藻效能,将旱伞草、粉绿狐尾藻、旱伞草+粉绿狐尾藻在自然水体水样中对比种植,对藻密度、叶绿素a、群落变化及有机物组成进行监测.结果表明:旱伞草+粉绿狐尾藻水样中,藻类建群过程的延迟期最短,在第13天达到峰值2.4×107/L,而对照、旱伞草、粉绿狐尾藻水样为4.48、1.15、2.03×108/L;旱伞草+粉绿狐尾藻水样中群落的演替速度最快,有机物种类最少为75种,而对照、旱伞草、粉绿狐尾藻水样有机物种类数量为131、90及121种.旱伞草+羽毛组合水样中新生成丙酮氰醇、磷酸三乙酯、莰烯及4-甲基苯酚这4种物质,可能为潜在的化感物质.

Abstract:

Allelopathic effects of C.alternifolius(Cyperus alternifolius),M.aquaticum(Myriophyllum aquaticum),C.alternifolius and M.aquaticum were investigated in coexistance experiments,and the algae biomass,chlorophyll a,community change and organic matters of the coexistance samples were monitored and analyzed.Cell numbers and Chl-a were significantly inhibited by C.alternifolius and M.aquaticum.The peak biomass of algae is 2.4×107/L,while that of the control,C.alternifolius,M.aquaticum is 4.48,1.15,2.03×108/L respectively.The organic matters analysis show that only 75 kinds of organic matter exist in the C.alternifolius and M.aquaticum coexistance samples while 131 kinds of organic matter exist in the control sample.Acetone cyanohydrin,Triethyl phosphate,Camphene and 4-methyl-4-Phenol were new produced matters by C.alternifolius and M.aquaticum which maybe the potential allelopathic matters.