元宝山南方红豆杉克隆种群生长型研究

Architecture of Clonal Population Taxus chinensis var.mairei on Yuanbaoshan Mountain

以广西元宝山的南方红豆杉无性系种群为研究对象,对其克隆分株的数量、形态特征(分株高度、基径、间隔物长度、分株位移)等进行调查分析,采用一个连续统指数对克隆构型进行定量描述,进而分析了克隆生长型与种群更新的关系.结果表明不同样地中南方红豆杉克隆分株的形态特征有差异,分株平均高度和基径为2.45m和6.2cm.克隆构型指数在0.6～0.87之间,变化范围较大,说明元宝山南方红豆杉无性系种群的克隆构型在不同的生境中有较大变化.采用的克隆构型指数能较好的描述南方红豆杉无性系的克隆构型特征,用指数描述的结果与形态学性状判断的结果具有一致性.元宝山的南方红豆杉种群更新包括种子更新和分株更新,自然状态下以分株更新为主.趋于"游击型"的南方红豆杉分株更新占优势,种子更新形成的幼苗很少见到;趋于"密集型"的南方红豆杉种子更新的比例增大.

A tree clonal plant Taxus chinensis var mairei was taken as study material Four 600 m\+2 plots were investigated from Taxus chinensis var mairei concentrating areas that locate in Yuanbaoshan Mountain, Guangxi province The ramets number, height and basediameter, spacer length (the distance of clonal organs interconnected ramets) and displacement of ramets were recorded Clonal architecture of Taxus chinensis var mairei was measured by using an index v, and the influence of architecture on population recruitment was discussedThe morphological traits of ramets in different plots were variedThe average ramet height and basediameter of 4 plots were 245 m and 62 cmThe index v of different plots ranged from 060 to 087It showed that the architectures of Taxus chinensis var mairei were differed in different environment, which would mean that Taxus chinensis var mairei clonal population was likely to have comparatively larger morphological plasticity The index v had good effect on describing architecture of Taxus chinensis var mairei The population recruitment of Taxus chinensis var mairei included seeds recruitment and ramets recruitmentIn natural conditions, ramets recruitment was the primary way of population recruitment The ramets recruitment was dominant in guerrilla Taxus chinensis var mairei, and the seedlings from seeds were seldom found, whereas seeds recruitment increased in phalanx Taxus chinensis var mairei The results suggested that clonal architecture of Taxus chinensis var mairei could affect population recruitment