两种种群动态模型的比较研究

对两种种群动态模型，逻辑斯蒂种群动态模型（简称ＬＭＰＤ）和可变资源下的种群动态模型，在微机上进行数值分析，比较了两种模型在１）没有资源输入２）具有不同初始资源状态３）有资源输入４）具有不同的资源消耗水平等四种情况下种群动态的差异。在ＬＭＰＤ中，种群的比增长率为种群大小的线性函数，而在ＭＰＤＶＲ中则为非线性函数，在ＬＭＰＤ，种群增长速率到达最大值（ｄＮ／ｄｔ）ｍａｘ的时间ｔｍ比在ＭＰＤＶＲ中要短，但

A Comparative Research on Two Models of Population Dynamics

The numerical analysis about two models of population dynamics,theLogistic model of population dynamics(the LMPD)and the model of population dynamicsunder variable resource(the MPDVR),is given in micro-computer;the different behavioursof population dynamics between the two models are discussed in four cases,a)without re-source input; b)with different initial resource state,c) with a constant resource input, d)with different resource consumption. In the LMPD,the relative growth rate of population isa linear function of population size (N),but in the MPDVR,it is a nonlinear function.t_m,the time for population to reach its maximum of growth rate(dN/dt)max is lower in the LM-PD than in the MPDVR,but t_s,the time for population to reach its steady state is greater inthe LMPD than in the MPDRV. The indexes,t_m,t_s and (dN/dt)max increase with the carry-ing capacity of environment(K),but they depend on the detail process which the carryingcapacity of environment (K)increases by.