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The Inhibitory Activities of Pistia Stratiotes L. on Three Cyanobacteria Species

Co-culture experiments and exudation experiments were designed to explore the allelopathic effects of Pistia stratiotes L. on three cyanobacteria species (Microcystis aeruginosa, Aphanizomenon flosaquae and Anabaena flosa- quae). The results showed that P. stratiotes L. can inhibited the growth of these three cyanobacteria species. The inhibi- tory activities was appeared from the third day and became stronger till the 7th day, the inhibitory rate exceed 90% in co-cultured experiments at the end of experiments. After six days experiments, the growth of three cyanobacteria was inhibited by the exudation of 20 g/L P. stratiotes L., the inhibition rate reached 72.3% for M. aeruginosa, 73.8% for Ap. flosaquae and 86.5% for An. flosaquae. Comparing the algae growth inhibitory rate of co-culture experiment and exu- dation experiment, the algae inhibitory rate of co-culture system was higher than exudation treatment, which probably because the plant can secretes the chemical compounds continuously while the allelochemicals in exudation are de- graded.