木荷天然种群生命表分析

以种群生命表及生存分析理论为基础,编制的木荷种群特定时间生命表,绘制死亡密度函数曲线、危险率函数曲线及生存曲线,分析种群动态趋势。结果表明,木荷种群有3个死亡高峰,个体平均生存能力的期望在第3龄级最大;存活曲线属于典型的Deevey-Ⅲ型,种群前期存活数随龄级急剧下降,只有11%的幼株能进入第2龄级,而后期存活值波动不大。

Analysis of the life table of natural population Schima superba

Based on the life table of population and the theory of survival analysis,the life table of Schima superba population was worked out,the curves of mortality density function,hazard rate function and survival were drawn and the population dynamics were analyzed.The results showed that the population had three peaks of mortality.Individual average expectation of survival ability reached most heaviest in age class 3.The survival curve of the population trended to the typical type of Deevey-Ⅲ.The population survives suddenly dropped in the earlier stage,only 11% young could enter the age class 2.And in the later stage,the survivals did not fluctuate largely.