武夷山米槠种群结构及谱分析

在武夷山自然保护区对米槠种群数量动态进行了系统研究，编制了静态生命表，分析了存活曲线和死亡曲线，同时应用谱分析方法分析种群数量的动态变化。结果表明，武夷山自然保护区米槠种群基本属于进展型或稳定型，幼龄级个体多，中老龄级个体少。不同海拔的种群密度存在差异，其中C种群密度最大；静态生命表显示，种群在Ⅰ、Ⅱ径级时死亡率较高，随着年龄增加，死亡率逐渐降低，但到了Ⅳ、Ⅴ径级，由于生理衰老死亡率又上升；种群期望寿命在Ⅰ、Ⅱ径级较高，随着年龄增加，期望寿命逐渐下降；不同海拔的米槠种群的存活曲线均接近于Deevey Ⅲ 型。米槠种群自然更新过程存在明显的周期。

Structure and Spectral Analysis of Castanopsis carlesii Population in Wuyishan Nature Reserve

The population dynamic of Castanopsis carlesii in Wuyishan Nature Reserve was studied and their age structures, the life table, survival curve and dead curves were analyzed.At the same time, the population dymamics were analyzed by spectral analysis method. The results showed that the C. carlesii population in Wuyishan Nature Reserve was a progressive or stable type. The number of young-age individuals was more than that of middle-age and old-age individuals. The population density differed amongdifferent altitudes,and the population C was the biggest. The life tables showed that the death rates at age class Ⅰ and Ⅱ were higher, and with the diameters class increasing, the death rates were decreasing. However, at age class Ⅳ and Ⅴ, the death rates increased again. The expected life of age class was higher before class Ⅳ, with age increasing, the expected life decreased gradually. The type of the survival curves of different population was close to Deevey Ⅲ. The spectral analysis of the population dynamics of C. carlesii was made, which showed that there was a marked regularity of periodic fluctuation in the process of natural regenration of C. carlesii.