卧龙自然保护区麦吊云杉的种群结构及空间分布格局的初步研究

A Preliminary Study on the Population Structure and Spatial Pattern of Picea brachytyla.

本文从龄级、等级度、胸径和树高结构以及空间分布格局分析了卧龙自然保护区五一棚麦吊云杉的种群特征。结果表明：麦吊云杉种群为一衰退种群，龄级结构呈倒金字塔模型，集中分布于８０年至１４０年之间；等级度结构主要由占总数的８０％以上的ＩＶ和Ｖ级组成；胸径和树高分布频率分别以３２．０ｃｍ～６４．０ｃｍ和１６．０ｍ～３２．０ｍ为度；采用方差／均值比率法和ｘ２检验法对麦吊云杉种群空间分布格局的研究得出，该地区的麦吊云杉种群趋于波松（Ｐｏｉｓｓｏｎ）分布。

おn the paper,the characeristics of the picea brachytyla population were analysed on the structure of age,size,chestheight,diameter and height of trees,and the spatial pattern in Wuyipeng,Wolong Nature Reserve,Sichuan.The results have shown that the Picea brachytyla population is a declining population,its agestructure is a reversed pyramid model,and the most trees are distributed between 80 and 140 years.The sizeClass structure consists of the plants as Ⅳ and Ⅴ ageclass,which made up over 80% of the total trees investigated.The distributive ratio of chestheight diameter and height of trees is high at 32.064.0 cm and 16.032.0 m,respectively.On the spatial pattern of plant population studied by the methods of Variance/Mean Test and X2 Test,it is shown that the spatial pattern of Picea brachytyla population is the Poisson distribution.