太湖湖水及沉积物磷释放对藻类生长潜力研究

在太湖湖水中添加不同的氮、磷营养物进行藻类生长潜力测试，试验结果表明：单独添加ＨＰＯ２－４和同时添加ＨＰＯ２－４、ＮＯ－３的所有浓度组均能显著促进斜生栅列藻（Ｓｃｅｎｄｅｓｍｕｓｏｂｌｉｑüｕｓ）和羊角月芽藻（Ｓｅｌｅｎａｓｔｒｕｍｃａｐｒｉｃｏｒｎｕｔｕｍ）的增长，而单独添加ＮＯ－３和ＮＨ＋４对二种藻类不但均无促进、并有一定抑制作用，表明了磷是太湖藻类生长的限制因子。在所试验条件下，厌氧状态（ＤＯ为０～２．５ｍｇ／Ｌ）下沉积物释放后滤液能促进斜生栅列藻增长，但对羊角月芽藻无促进效应；好氧状态下（ＤＯ为７．５～８．０ｍｇ／Ｌ）沉积物释放后滤液均不能促进二种藻类增长。

ALGAL GROWTH POTENTIAL AS AFFECTED BY LAKE WATER AND PHOSPHORUS RELEASED FROM SEDIMENTS IN TAIHU LAKE

Addition of nutrients (N and P) to lake water in Various doses had stimulated the growth of Selenastrum capricornutum and Scendesmus obliquus . The results showed that addition of HPO 2- 4, NO - 3 to lake water had obviously stimulated the growth of Algae, but did not show stimulation effects as NH 4 and NO - 3 alone added. It appears that phosphorus is a limiting factor for algal growth in Taihu Lake. The filtrate of the anaerobic release test of sediment had stimulated the growth of Scendesmus obliquus , but had not stimulated the growth of Selenastrum capricornutum . The filtrate of the aerobic release test of Sediment had not stimulated the growth of Algae under the test conditions.