两种沉水植物浸提液对斜生栅藻的化感效应  

Allelopathic Effect of Water Extracts from Two Submerged Macrophytes on Growth of Scenedesmus obliquus

作　　者：杨琳[1] 吴伟[1,2] 胡庚东[1,2] 瞿建宏[1,2] 陈家长[1,2] 李成君[3] 

机构地区：[1]南京农业大学渔业学院,江苏无锡214081 [2]中国水产科学研究院淡水渔业研究中心,内陆渔业生态环境与资源重点开放实验室,江苏无锡214081 [3]江苏省洪泽县水产局,江苏洪泽223100

出　　处：《农业环境科学学报》2008年第4期1530-1535,共6页Journal of Agro-Environment Science

基　　金：江苏省三项工程项目(PJ2006-50)

摘　　要：采用玻璃水族箱及恒温光照培养箱,分别研究了两种沉水植物伊乐藻(Elodea canadensis)和蓖齿眼子菜(Potamogeton pectinatus L.)的浸提液对斜生栅藻(Scenedesmus obliquus)的化感效应。结果显示,这两种沉水植物的浸提液均对斜生栅藻的生长具有化感效应,且都表现为"低促高抑"的现象。伊乐藻和蓖齿眼子菜20%浸提液试验组对斜生栅藻有明显的促生长效应,试验第7d时,其藻细胞浓度分别为同期对照组的237%和180%。伊乐藻和篦齿眼子菜50%～90%浸提液试验组对斜生栅藻的生长有不同程度地抑制,且抑制作用随着浸提液浓度的增加而逐渐增强。试验第7d时,伊乐藻和蓖齿眼子菜90%浸提液试验组藻细胞浓度分别为同期对照组的38%和32%。从对藻类生长的抑制效果上看,伊乐藻浸提液对斜生栅藻的EC5(06d)为70%,篦齿眼子菜浸提液对斜生栅藻的EC5(06d)为55%,表明了眼子菜浸提液对斜生栅藻的抑制效果较伊乐藻浸提液好。Elodea canadensis and Potamogeton pectinatus L. are submerged plants used for phytoremediation on eutrophic lakes, and Scenedesmus obliquus is one of the pollution indicator species in fresh water. This paper studied the allelopathic effect of water extracts from two submerged macrophytes Elodea canadensis and Potamogeton pectinatus L. on growth of Scenedesmus obliquus. The plants were immersed respectively in distilled water to collect allelochemicals. The results indicated that the water extracts from the two submerged macrophytes had allelopathy on Scenedesmus obliquus and performed by ‘low concentration promoted, high inhibited＇. During 7 days of the experiment, the growth of Scenedesmus obliquus was stimulated in the treatment groups with 20% of the water extracts from Elodea canadensis and Potamogeton pectinatus L., while, the experimental groups with 50%-90% of the water extracts had different inhibition on Scenedesmus obliquus, and the allelopathic inhibitory effects increased with the increasing concentrations of the water extracts. The cell concentrations of Elodea canadensis and Potamogeton pectinatus L. in experimental group with 90% of the water extracts were 38% and 32% of those in the control, respectively. These two submerged macrophytes might be a potential candidate for algae control. The EC50（6 d）of Elodea Canadensis and Potamogeton pectinatus L. on Scenedesmus obliquus were 70% and 55%, respectively. From the allelopathic inhibition of algae, the water extracts from Potamogeton pectinatus L. had more inhibitory effects on Scenedesmus obliquus than Elodea canadensis.

关 键 词：伊乐藻 篦齿眼子菜 斜生栅藻 化感效应 

分 类 号：X173[环境科学与工程—环境科学]