灵空山油松种群年龄结构与动态分析

对山西灵空山自然保护区的油松（Pinus tabulaeformis）种群进行了调查,利用生存分析理论及谱分析理论,分析了油松种群径级结构和静态生命表,绘制了存活曲线,同时分析了种群数量的周期性。主要结果如下：（1）油松种群幼苗幼树个体数较多,中径级的个体数较稳定,而高径级由于种间竞争及环境因子的影响,个体数明显下降。（2）油松种群的存活曲线呈现Deevey-Ⅱ型。动态表现为前期增长,中期稳定,后期衰退。（3）油松种群波动存在小周期,但变化不大,说明油松种群发展较为稳定。

Population Structure and Dynamics of Pinus tabulaeformis in Lingkong Mountain of Shanxi Province

In Lingkong Mountain, one four hectare plot was established for a field investigation of Pinus tabulaeformis populations. Based on survival and spectral analysis, size structure and static life tables were constructed,the curves of survival were drawn,and the periodicity of P. tabulaeformis population was analyzed. Results showed that the individual number of seedlings and saplings of P. tabulaeformis population were more than other levels of P. tabulaeformis. While the middle level of P. tabulaeformis was relatively stable,the high level of P. tabulaeformis was significantly reduced as a result of interspecific competition and environmental factors. The estimated survival curve roughly showed the form of Deevey-Ⅱ. The P. tabulaeformis popula- tion fluctuation presented a minor but inconspicuous cycle. This showed that P. tabulaeformis development was steady.