Abstract: We investigated the effect of field decay biochar on the stability of phytoplankton community in the simulated wetland system of Iris wilsonii. Experimental results show that the biochar can maintain the stability of ketone in the simulated wetland system by adsorptiondesorption when the mass ratio of biochar is 5 g/kg in wetland matrix. The stability can make the phytoplankton community under a relatively stable intensity of allelochemical stress, which make the small succession of the community normal.

Key words: phytoplankton, Iris wilsonii, wetland, biochar