三清山小花木兰种群生命表及生存分析

The Life Table and Survival Analysis of an Endangered Plant Magnolia Sieboldii Population in Sanqing Mountain

以种群生命表和生存分析理论为基础,编制了三清山小花木兰(Magnolia sieboldii)天然种群静态生命表,绘制存活曲线、死亡曲线、生存函数曲线,利用谱分析研究了小花木兰种群的更新动态.结果显示:(1)三清山小花木兰种群结构存在波动性,趋于DeeveyⅡ型;(2)小花木兰死亡率和消失率趋势一致,均在Ⅳ和Ⅸ龄级出现峰值;(3)生存函数曲线表明,三清山小花木兰种群中树数量出现锐减现象;(4)谱分析显示,小花木兰种群动存在Ⅸ龄级小周期波动,这一波动与小花木兰进入生理衰老期有关.

The static life table of Magnolia sieboldii population in Sanqing Mountain was compiled by applying the age class structure represented by DBH class.The Survival curve,death curve and survival functional curve were also determined,and population regeneration was analyzed by spectral analysis.The results showed that：（1） There was a fluctuation in the structure of Magnolia sieboldii population.The survival curve tended to the type of Deevey Ⅱ,and the number of seedlings was small.The Magnolia sieboldii population was declining population.（2） One peaks of mortality rate and vanishing rate existed on the Ⅳ age class and the other on the Ⅸ age class in this population.（3） The Magnolia sieboldii population number decreased sharply at middle stage according to the survival functional curves of this population.（4） Spectral analysis revealed that a small fluctuation atⅨ age class was existed in the Magnolia sieboldii population natural regeneration,and this fluctuation was caused by the population individuals entering physiological aging period.