在三峡库区香溪河的支流高岚河库湾修建生物浮岛,研究生物浮岛对三峡库区典型支流库湾水质和浮游藻类的影响.结果表明,高岚河水质处于中营养型-轻度富营养型水平.8月藻类大量生长期间,浮岛区水体Chl-a、DO和CODMn含量低于对照区,NH4+-N含量高于对照区.浮岛植物对TN负荷的去除效果由高到低依次为美人蕉(Canna indica)、风车草(Cyperus alternifolius)、菖蒲(Pontederia cordata)和梭鱼草(Acorus calamus),对TP负荷的去除效果由高到低依次为美人蕉、风车草、梭鱼草和菖蒲.在浮岛区和对照区共发现藻类7门31属,4月以绿藻和硅藻为主,8月以蓝藻为主.浮岛区和对照区藻类种群结构无明显差异,但4和8月浮岛区藻类生物量明显低于对照区.%A biological floating island was built in the estuary bay of the Gaolan River,which is a tributary of the Xiangxi River in the Three-Gorge Reservoir region.Samples were collected from several sites around the island for monitoring of changes in physico-chemical parameters and phytoplankton.Results show that the water is moderately to lightly eutrophied,with algae blooming in August.The water around the island is lower than the water in CK in content of Chl-a,DO and CODMn,but higher in NH4+-N.The plants on the floating island follow an order of Canna indica ＞ Cyperus alternifolius ＞ Pontederia cordata ＞ Acorus calamus,in TN removal rate,and an order of Canna indica ＞ Cyperus alternifolius ＞ Acorus calamus ＞ Pontederia cordata in TP removal rate.In the island area and CK,a total of 31 genera of algae,belonging to 7 phyla were identified.Chlorophyta and Bacillariophyta dominated in April while Cyanophyta did in August.No significant difference was found between the island area and CK in algal community structure.The density of algae in the floating island area is significantly different(P ＜0.05)from that in the control area in April and August,with the former significantly lower than the latter.
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