浒苔对赤潮异湾藻的克生作用

研究了浒苔对赤潮微藻—— 赤潮异湾藻生长的克生效应。结果表明, 浒苔新鲜组织对赤潮异湾藻的生长具有强烈的克生效应; 一次性添加浒苔培养过滤液对赤潮异湾藻生长没有显著的抑制作用, 而半连续添加浒苔培养过滤液对赤潮异湾藻生长具有显著的克生作用; 浒苔干粉末和甲醇抽提液均对赤潮异湾藻的生长产生显著的抑制作用。试验结果表明, 抑制赤潮异湾藻生长的物质很可能更多地存在于浒苔组织内, 向环境中分泌的克生物质较少。因而, 克生物质的连续分泌是有效克制赤潮异湾藻生长的关键。同时, 克生作用存在着明显的浓度效应, 当抑制物浓度达到一定阈值才表现出明显的克生作用, 在阈值之上浓度越高克生作用越强。

Allelopathic effects of Ulva prolifera on Heterosigma akashiwo

Allelopathic effects of Ulva prolifera on the harmful algae (Heterosigma akashiwo) were studied in laboratory. The results showed that the growth of H. akashiwo was significantly (P>0.05) lowered by fresh tissue of U. prolifera. The growth of H. akashiwo was not significantly (P>0.05) lowered by U. prolifera culture medium filtrate under initial filtrate addition, but the growth of H. akashiwo was strongly inhibited by macroalga culture medium filtrate under semi-continuous filtrate addition. The growth of H. akashiwo was strongly inhibited by dry powder and methanol extract of U. prolifera. The results showed that allelochemicals existed more in the tissue of U. prolifera than excreted to the medium and continuous addition of allelochemicals. It was important to effectively control the growth of H. akashiwo. The concentration effect of antagonistic relationship existed between U. prolifera and H. akashiwo.