广西龙虎山自然保护区龙荔种群生命表分析

Life Table Analysis of Dimocarpus confinis Population in Guangxi Longhushan Nature Reserve

以广西龙虎山自然保护区龙荔种群为调查对象,编制其静态生命表,进行种群生存分析。通过绘制亏损率曲线、存活曲线、死亡率曲线、生存函数曲线,分析种群数量及动态变化。结果表明:该龙荔种群存活曲线趋于Deevey-Ⅰ型,种群的存活率呈单调减少,相应的积累死亡率呈单调增加,其下降或增加的幅度是前期大于后期。种群生长过程中在第Ⅳ龄级存在一个死亡高峰。说明在自然保护的情况下龙荔种群的生存状况仍然严峻,需适当进行人为护理并加强资源调查,对优良种质进行异地保护。

Based on the data of Dimocarpus confinis population in Longhushan Natural Reserve of Guangxi,the curves of lose rate,survival rate,mortality rate,and survival function of the population were made for the static life table to analyze the population dynamics.It indicates that the population has a peak of mortality at Ⅳ age class,and survival curve of the population belongs to the type of Deevey-Ⅰ,the survival rate of population is monotonously decreased,and the accumulated death rate is monotonously increased concomitantly.The altered degree is more obvious in early stage than in later stage.The results show that the current live condition of the Dimocarpus confinis population is still under severe situation even with the nature conservation.It is necessary to conduct the manual management and strengthen investigation on resources,and to start ex-situ conservation for the excellent germplasm.