自然保护区设置的若干问题探讨

Problems of the size and number of nature reserves

建立了一个既包含局域种群动态，又包含集合种群侵占率的模型，并在这两个层次上进行了计算机模拟，结果表明：１）集合种群的存活时间随着保护区数目的增大先增大而后减小，即保护区的数目维持在中等大小时最有利于种群在集合种群水平上的存活。２）种群的初始分布对自然保护区数量的最优值的影响不明显。

The authors begin with local populations and construct a model which include both local population and metapopulation dynamics, then carry out simulation with computer at these two levels. The results indicate: (1) The time to extinction of a metapopulation increases first and then decreases as the number of reserves increases. That is to say an intermediate reserve number exists for which metapopulation persistence is optimal. (2) The optimal number of reserves has little relationship with initial size of local populations.