Study on Inhibitory Effect of Wheat Stalk on Algae by Different Treatments

Abstract

This paper reports the effects of wheat stalk anaerobic extract and wheat stalk powder on the inhibition ofMicrocystis aeruginosain the laboratory, and the broken wheat stalk on the growth of the phytoplankton and zooplankton in natural water. The results show that: (1) the Wheat stalk Anaerobic extract has inhibitory effect on theMicrocystis aeruginosa, the average inhibiting rate was 59%; (2) the Wheat stalk powder has obvious inhibitory effect on theMicrocystis aeruginosa, the average inhibitory rate was 74% and the effect increased with the passage of time. The inhibitory rate remained the range of 75%~96% from the 3rd day to 13th day after adding the Wheat stalk powder; (3) In natural water, the addition of broken wheat stalk can cause change of the dominant phytoplankton species in which cyanophyte is not obvious dominant species anymore, and the broken wheat stalk has inhibitory effect on the growth of phytoplankton cells; (4) The addition of broken wheat stalk can promote the growth of poor-middle nutrition species zooplankton in natural water, and make their abundance soars rapidly.