Abstract: A model about the ecological field of floating bed system was constructed based on in situ experiment. The simulation results indicated that the ecological potential of floating bed system was the highest in ‘field source’, and decreased gradually with increasing horizontal and vertical distances to the ‘field source’. Plant kyegrass (Lolium multiflorum) biomass in the floating bed system had notable effects on the ecological potential. The more vigorous the plant grew, the higher the ecological potential was. In a 1 m × 1 m ecological floating bed and when the plant biomass was 39.40 kg·m^-2, the maximum affecting distance of ecological field was 1.86 m, and the maximum affecting area was 10.90 m². This model could simulate the spatial distribution characteristics of the ecological field of floating bed system, reflect the dynamic changes of plant growth with the spatial distribution of ecological field, and quantify the affecting degree of the floating bed system to the water quality at any point within the affecting scope of the bed system. The construction of this model could provide theoretical basis for the application of ecological floating bed in treating polluted water.

Key words: Mating, Temperature, Spodoptera exigua, Sex pheromone