【摘要】 对松突圆蚧为害时间不同的两个调查区的松突圆蚧种群动态进行调查，建立了相应的数学模型．对松突圆蚧种群的全年种群波动规律运用带时滞效应的Ｌｏｇｉｓｔｉｃ模型进行拟合，通过内禀增长率ｒ和时滞τ的拟合值对种群出现的周期性波动作出解释．更多还原

【Abstract】 A Logistic model with time lag effect was established to simulate the population dynamics of Hemiberlesia pitysophila Takagi in two experimental fields with diffe rent damaged time. The periodic oscillation of the population was explained by the simulation values of innate capacity for increase r and time lag τ更多还原