马缨杜鹃种群生命表分析

Analysis on the Population Life Table of Rhododendron delavayi

[目的]对马缨杜鹃种群统计进行初步探讨。[方法]以种群生命表及生存分析理论为基础,编制种群静态生命表,分析生存率、积累死亡率和死亡密度等生存函数及危险率函数曲线变化,进而分析种群数量的动态变化。[结果]生命表分析表明,马缨杜鹃种群损失度动态趋势和死亡率变化相似,呈波动变化。该种群有3个死亡高峰。种群前期存活率随龄级变大急剧下降,仅有4.3%能进入第8龄级,而后期存活值波动不大。存活曲线经统计检验更趋于DeeveyII型。生存函数分析表明,积累死亡率单调增加,生存率单调下降,其增加或下降幅度是前期高于后期。死亡密度函数曲线和危险率函数曲线变化趋势基本一致。[结论]该研究为百里杜鹃林区的马缨杜鹃的合理利用和开发提供理论依据。

[ Objective] The study aimed to discuss the population statistic of Rhododendron delavayi preliminarily. [ Method] On the basis of population life table and the theory of survival analysis, the static population life table was compiled. The variations of survival functions including survival rate, accumulated mortality and death density, as well as function of danger probability were analyzed. Furthermore, the dynamic variation of population amount was analyzed. [ Result] The analysis on the life table showed that the dynamic trend of population loss degree of R. delavayi was similar to the variation of its mortality which was fluctuating. Three death peaks appeared in the population. The prophase survival rate of population was decreased sharply along with the increasing of age grade, only 4.3% could grow into the 8th age grade and there was little fluctuation in anaphase survival rate. The statistical test indicated that the survival curve tended to be DeeveylI - type. The analysis on survival function showed that the accumulated mortality was monotonously increased, the survival rate was monotonously decreased and the variation in prophase was bigger than that in anaphase. The variation trends of death density and danger probability functions were ba- sically identical. [ Conclusion] The study provided theoretical basis for reasonably exploiting R. delavayi growing in Baili azalea area.