太湖开阔水域凤眼莲的放养实验

An experimental study on culture of Eichornia crassipes(Mart.)Solms on open area of Taihu Lake

１９９１～１９９３年在无锡市马山自来水厂太湖水源区开展的旨在除去藻类和净化水质的物理生态工程实验结果表明，在常有大风浪的太湖开阔水域凤眼莲能正常生长繁殖，夏季的净生产力达５００ｇ／ｍ￣２／ｄ左右。根据实验所得，探讨了在该湖开阔水域放养凤眼莲的技术，研究了凤眼莲在不同时期、不同密度下的生产力、增长率、适宜放养密度等，提出了对凤眼莲生长的计算方法。在此基础上。

An experimental study on the preduction,growth rate,optimum density with maximum production and maximum eapacity density of Eichhornia crassipes(Mart.)Solms( ECS ) in different perieds is taken place during the physico-ecological engineering for removing algae and purifying water quality in intake area of Mashan Drinking Water Supply Plant,Wuxi for three years(1991～1993).The experimental results showed that ECS is able to grow and breed on the open area of Taihu take during strong wave as well as in the normal condition and its net productivity in summer is high up to 500 g/m￣2/d.The techniques for culturing ECS in large lake with strong wind are improved and the statistical metheds for calculation the growth characteristics of ECS are developed.The difference of individual bio-characteristics of ECS growing on open area of large lakes and in small rivers/lakes and the reasons of such difference are analyzed.