濒危植物急尖长苞冷杉种群结构及空间分布格局

以分布在西藏色季拉山的急尖长苞冷杉为研究对象,设置30m×30m样地15块,应用相邻格子法进行每木调查,从高度结构、基径结构、年龄结构以及空间分布格局方面分析了急尖长苞冷杉的种群特征。结果表明:在研究区,急尖长苞冷杉种群的高度结构、基径结构和年龄结构均表现为反"J"型,相关性也较明显,基径与年龄的关系为y=13.5640x0.7078(R2=0.9144);总体上,幼苗的后备储量特别大、死亡率也较高,但补充率大于死亡率,种群表现为稳定发展型。在不同尺度下,不同龄级(发育阶段)急尖长苞冷杉种群分布格局有差异。随着取样尺度的增大,各龄级植株的分布格局由聚集趋向均匀分布,聚集强度减弱,同一取样尺度下,龄级越大,聚集强度也越弱。研究结果可为该资源的管理及持续利用提供理论依据。

The Population Structure and Spatial Pattern of Abies georgei

In the paper,the research object was Abies georgei var.smithii that distributes in Sejila mountain of Tibet.For the research,fifteen 30m×30m plots were set up and the contiguous grid quadrats applied to sampling for field data.The population characteristics were analyzed including height structure,basal diameter structure,age structure and spatial pattern.The results indicated that three structures of A.georgei population manifested as the anti-"J" type,the correlation was obvious,the relationship of basal diameter and age was y=13.5640x0.7078(R2=0.9144),seedlings backup reserved particularly large,the death rate was high,but the supplemental rate was higher than the death rate and the population was steady.Under different scales,the spatial patterns of different age-class(developmental stage) plant were different.With the sampling scale increasing,the spatial patterns of different age-class plants were clumped distribution pattern,but tended to be uniform distribution pattern,the degrees of intensity were decreasing from high to low,the same sampling scale,the greater the age class,the weaker the intensity.The research results provided the theoretical basis for management and sustainable utilization of A.georgei.