硫酸铜控藻对浮游植物群落的影响
EFFECTS OF COPPER SULFATE TREATM ENT ON EUTROPHIC URBAN LAKE PHYTOPLANKTON COMM UNITIES
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摘要: 硫酸铜广泛用于水华藻类的去除和控制。本文测定了不同藻类对Cu2+的敏感性，几种常见水华藻类对Cu2+的敏感性顺序为:铜绿微囊藻＞水华鱼腥藻＞小环藻＞莱哈衣藻＞斜生栅藻。在某城市的富营养化湖泊中用Cu-SO4.5H20(102μg／L Cu2+)作为杀藻剂控制蓝藻水华的试验结果表明:在用硫酸铜控制蓝藻水华的过程中，水体透明度有明显改善;总氮总磷无显著变化;浮游植物总数在试验初期下降，但在试验后期则有所回升，在试验初期蓝藻门数量有所下降，绿藻门和硅藻门数量增加，这与不同藻类对Cu2+敏感性差异相关;试验后期，蓝藻门种类快速生长，并成为优势种;水柱中微囊藻毒素的浓度随藻类数量的减少在4d内大幅降低。Abstract: Copper sulphate treatment is widely used as a global and empirical method to remove or control phytoplanktonblooms. We tested the acute toxicity of 5 species of familiarmicroalgae and gave an urban lake copper sulfate treat in order to illuminate how the water body response to copper treat, especially the change of phytoplankton species and density of microcystins. According to OECD Alga growth inhibition test, effect of copper on 5 species of familiarmicroalgae was tested, and species of Cyanophyta showed much higher sensitivity to copper than species of Chlorophyta and Bacillariophyta. In a eutrophic urban lake, CuSO4·5H2O was used as algicide to control the water bloom caused by cyanobacterial. The copper concentration applied was 102μg/L (as copper). We investigated the lake response to copper sulfate, which showed that the transparence was substantially improved; TN and TP did not change a lot; total algal decreased just after the copper sulfate treatment, and later increased again; at the beginning of the experiment, species of Cyanophyta died and the amount sharply decreased, Bacillariophyta and Chlorophyta turned to be the preponderant species, which could be related to species sensitivity to copper, and speciesof Cyanophyta began to grow again and took the predominance few days later; density of microcystins in the water rapidly decreased to level lower than that in the treatment before, only in 4d.
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Keywords:
- Copper sulfate /
- Water bloom /
- Control /
- Eutrophication
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