不同生境濒危植物龙棕种群结构及其动态特征

【目的】分析不同生境下龙棕种群结构及动态特征，探究其主要影响因素，为该区龙棕种群的保护、恢复和更新提供基础的理论依据。【方法】通过对楚雄州大尖山自然保护区内3种不同生境(阔叶林、针阔混交林、灌丛)龙棕种群调查，编制龙棕种群的静态生命表和绘制其存活曲线和生存分析函数曲线，并利用时间序列模型对种群的数量动态做出相应的预测，以深入了解不同生境下龙棕种群结构及动态特征。【结果】(1)在3种生境中龙棕种群均处于衰退状态，对外界干扰较为灵敏，存活曲线呈现Deevey-Ⅲ型，龙棕个体在幼苗阶段出现大量死亡。(2)3种不同生境下龙棕种群都分布不均，呈聚集分布，说明龙棕种子传播以母株为中心扩散。【结论】从种群密度大小上来看，阔叶林中的龙棕种群密度最大，其次是针阔混交林，最小的是灌丛。结合对种群年龄结构的研究，进一步证明水分条件较好的阔叶林和针阔混交林更有利于龙棕种群的生存。

Population structure and dynamic characteristics of endangered plant Dragon palm in different habitats

【Objective】 To analyze the population structure and dynamic characteristics in different habitats and explore the main influencing factors, so as to provide theoretical basis for the protection, restoration and renewal of the population in this area. 【Methods】 The static life table and the survival curve and the survival analysis function curve of the population were compiled by investigating the population of the dragon palm in three different habitats (broad-leaved forest, mixed forest and shrub) in Dajianshan Nature Reserve of Chuxiong, and the population dynamics were predicted by using the time series model. In order to understand the population structure and dynamic characteristics in different habitats. 【Results】 The results showed that in the three habitats, the population was in a state of decline, sensitive to external interference, the survival curve showed DeEVeY-III type, and a large number of individuals died in the seedling stage. In the three different habitats, the distribution of dragon palm population was uneven and clustered, indicating that the seed spread of Minglong palm was centered on the mother plant. 【Conclusion】 In terms of population density, the population density of dragon Brown was the highest in broad-leaved forest, followed by mixed forest, and the smallest was shrub. Combined with the study on the population age structure, it was further proved that the broad-leaved forest and the mixed forest with better water conditions were more conducive to the survival of the population.