Effect of Chelating Substances on the Succession of Blue-Green Algae

1999年4月至2001年11月，采用藻类分析方法测定了鹿儿湖的藻类生长势(AGP)和限制物质。铜绿微囊藻滤液的AGPS均小于2 mg/L。添加EDTA或EDTA和硝酸盐均能促进微囊藻、鱼腥藻、裸藻的生长。在没有EDTA的情况下，磷和氮的同时添加都能使振荡菌生长。可见，络合物质的浓度对蓝藻演替有重要影响。从葛洲湖沉积物中分离的富马酸和黄腐酸等天然螯合物质减轻了铜绿微囊藻对重金属的毒性。

Determination of Algal Growth Potential (AGP) and limiting substances in Lake Kasumigaura were carried out from April 1999 to November 2001 using algal assay procedure. AGPs of filtrates using Microcystis aeruginosa were less than 2 mg/L. The growth of Microcystis, Anabaena, Phormidium were stimulated by the addition of EDTA or EDTA and nitrate. Oscillatoria was able to grow by the both addition of phosphorus and nitrogen without EDTA. It seems that chelate substance concentration was very important for the blue-green algal succession. Natural chelate substances such as fumic and fulvic acids isolated from Lake Kasumigaura sediment mitigated the heavy metal toxicity for the growth of Microcystis aeruginosa.