太湖铜锈环棱螺对氮磷的降解作用

太湖的五湖里湾是一个富营养湖，水质亟待改善。铜锈环棱螺是太湖的常见种群，通过在五里湖的一些室内外实验，研究了螺对水体透明度，总磷、氨氮、溶解氧的作用，发现它能交水体透明度从０．５ｍ左右提高到１．３ｍ，使室内水体浊度迅速降低，降解总磷的幅度能达到５０％，分析为铜锈环棱螺的絮凝作用所致；并且，在其水域氨氮深度大幅度降低，使实验点高达５ｍｇ／Ｌ以上的氨氮浓度降至２ｍｇ／Ｌ以下，从感观和水质指标两方面有效

ABATEMENT OF THE NITROGEN AND PHOSPHORUS CONCENT RATION IN WATER BY THE SNAIL Bellamya Aeruginosa IN LAKE TAIHU

Lake Wuli is a hypertrophic bay of Lake Taihu, its water quality must be improved as soon as possible. In a serial of experiments, the snail Bellamya aeruginosa was studied in detail. It was found that B.aeruginosa may notably improve SD transparency and diminish TP through its flocculation, the SD can be improved to 1.3m from 0.5m, and TP concentration can be reduced by about 50%. With its symbiosis system the snail may also notably decrease NH 4 + -N in the open water area of the lake. But B.aeruginosa will consume so much DO that its concentration may fall is down to 0 mg/L in the morning. The conclusion is that the nutrient load of nitrogen and phosphorus compounds may be attenuated by B.aeruginosa and its symbiosis system, and better water quality may be achieved.