Effect of light intensity and initial planting density on the growth of Pistia stratiotes L.

Cultivated Pistia stratiotes L.in the cage,the effects of different light intensity(55 535,13 328,2 220 lx)and initial planting density(0.5,1.0,1.5,2.0 kg/m2)on the plant length,root length,leaf number,leaf area,ramet rate and biomass of Pistia stratiotes L.were researched.Results showed that light intensity of 55 535 lx was more conductive to the growth of Pistia stratiotes L.,and the plant length,root length,leaf area,ramet rate and biomass of Pistia stratiotes L.under this light intensity significantly higher than that of the other two kinds of light intensity.The size of the plant length,root length,leaf number,leaf area,ramet rate and biomass of Pistia stratiotes L.were increased with light intensity increasing.Pistia stratiotes L.got the the fastest growing at the density of 2.3 kg/m2,when the density reached 5.6 kg/m2,the biomass of Pistia stratiotes L.almost no longer continued to increase.Experiments showed that the suitable light intensity of Pistia stratiotes L.was 55 535 lx,the suitable planting density of Pistia stratiotes L.was 2.3 kg/m2,and 5.6 kg/m2 was probably the growth of upper density of Pistia stratiotes L.