铜绿微囊藻·螺旋鱼腥藻和水华束丝藻竞争优势的研究

用铜绿微囊藻、螺旋鱼腥藻和水华束丝藻进行单独培养和共培养,研究其生长特性和培养液N、P含量变化,探讨其竞争优势.结果表明:单独培养时,水华束丝藻生长优势最显著,其次是螺旋鱼腥藻;共培养时,水华束丝藻完全被抑制,P含量较高时,螺旋鱼腥藻生长占优,P含量较低时,铜绿微囊藻占优.铜绿微囊藻和螺旋鱼腥藻均向水体中分泌或释放较多的含N化学物质,而水华束丝藻几乎不分泌或释放含N物质.铜绿微囊藻、螺旋鱼腥藻、水华束丝藻和混合藻吸收的N、P比值分别为12.1、14.8、12.5和15.2,推测此比值是它们生长最适N、P比.该研究为解释自然水体中蓝藻水华优势种演替的原因提供了新证据.

Studies on Conpetition Predominance of Microcystis aeruginosa, Anabaena spiroides and Aphanizomeno flos-aquae

The Microcystis aeruginosa,Anabaena spiroides and Aphanizomeno flos-aquae were experimented by single culture and multi-culture.Their growth characteristics and the variation of nitrogen and phosphorus content were investigated to discus their competitive advantages.The results showed that,in single culture,the growth advantage of Aphanizomeno flos-aquae was most significant,and that of Anabaena spiroides was next;in multi-culture, the growth of Aphanizomeno flos-aquae was fully inhibited.The growth of Anabaena spiroides was dominant at higher phosphorus content,while that of Microcystis aeruginosa was dominant at low phosphorus content.Both Microcystis aeruginosa and Anabaena spiroides released chemical matter with nitrogen,but not by Aphanizomeno flos-aquae.The ratio value of nitrogen to phosphorus absorbed by Microcystis aeruginosa,Anabaena spiroides,Aphanizomeno flos-aquae and mixing alga were 12.1,14.8 and 12.5 and 15.2 resp.It suggests that these ratio values are the optimum for their respective growth.This study provides the new evidence to explain the reason of the alternation of dominant species in phytoplankton community in natural water bodies.