咸丰红椿种群生命表及谱分析

Life Table and Spectral Analysis of Toona ciliata Population in Xianfeng

为研究红椿种群特征,将林木径级代表年龄结构,编制静态生命表,绘制并分析了存活曲线,对种群进行了谱分析。结果表明:咸丰县村木田红椿种群存活曲线接近DeeveyⅡ型;qx和Kx均在2、6级出现峰值,红椿生理特性、环境筛与人为干扰因素对种群影响较大。波谱分析表明:红椿种群天然更新存在着周期性,且有小周期的多谐波叠加。

To research the features of Toona ciliata population in Xianfeng region,diameter classes of T. ciliata plants were transformed into according age classes, a static life table was made, curves of survival rate was drawn, and a spectral analysis of the population was conducted. The research indicated that the survival curve conforms approxi- mately to that of Deevey II; qx and Kx surge to peaks in 2, and 5 age classes, showing the physiological features at different growing stages,environmental sieves and human disturbances influence the T. ciliata population. The spec- tral analysis of the population demonstrated there was a periodicity in natural regeneration of the T. ciliata popula- tion,with multi--harmonic wave superposition Of multiple minor cycles.