不同干扰强度天然次生林中多穗柯种群特征

Population Characteristics of Lithocarpus polystachyus in Natural Secondary Forest with Different Interference Intensity

2018年11月采用样地调查的方法,对福建建宁不同干扰强度天然次生林中的多穗柯种群特征进行分析,并编制其种群静态生命表。研究结果表明:多穗柯种群个体数较少,但呈聚集分布,随着干扰强度的提高,Ⅰ、Ⅱ龄级幼苗、幼树随之减少。受人为干扰的种群类型均缺乏Ⅴ级大树,种群类型属于初生种群(N1);而无人为干扰的种群则缺乏Ⅰ、Ⅱ级幼苗、幼树,但有V级大树分布,种群类型属于中衰种群(S2)。总的来说所有多穗柯种群不稳定,属于过渡类型。在静态生命表中,Ⅰ、Ⅱ级幼苗、幼树死亡率较高,存活率在Ⅲ、Ⅳ级出现小高峰,过后存活率又急速下降,Ⅱ级平均生命期望最大。表明要维持多穗柯种群稳定性,需要人工保育措施并适当释放空间。

In November 2018,the method of sampling survey was adopted to analyze the population characteristics of Lithocarpus polystachyus in the natural secondary forest of Jianning,Fujian with different interference intensity,and the static life table of the population was compiled.The results showed that the number of individuals in the Lithocarpus polystachyus population was small,but it was clustered and distributed.With the increase of interference intensity,the number of Ⅰ and Ⅱ age seedlings and saplings decreased accordingly.The population types affected by human disturbance all lack V-class trees,and the population type belongs to the primary population(N1).However,the population without human interference lacks Class Ⅰ and II seedlings and saplings,but has the distribution of Class Ⅴ trees,and the population type belongs to the middle and declining population(S2).In general,all Lithocarpus polystachyus populations are unstable and belong to the transitional type.In the static life table,the death rate of class Ⅰ and Ⅱ seedlings and saplings was higher,the survival rate showed a small peak in Class Ⅲ and Ⅳ,and then the survival rate declined sharply,and the average life expectancy of class Ⅱ was the highest.The results showed that artificial conservation measures and proper space release were needed to maintain the stability of the Lithocarpus polystachyus population.