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为研究陕西子午岭马栏林区人工油松(Pinus tabuliformis)幼树的表型变异特征,选取种植于草地、灌木丛、白桦(Betula platyphylla)林、辽东栎(Quercus wutaishanica)林的4种人工油松幼树种群,对其针叶及枝条的表型性状进行分析。结果表明:人工油松幼树种群的7个表型性状(针叶长度、宽度、厚度、长宽比及当年生枝条的长度、基径、着生针叶数)在种群内及种群间都存在极显著差异;种群间平均表型分化系数为72.88%,大于种群内的27.12%,表明种群间变异是油松幼树表型变异的主要部分,不同种群所处的环境差异是油松幼树表型变异的主要原因;表型性状的平均变异系数为19.74%,性状离散程度居中;相关性分析表明,叶长与叶宽不相关,其他性状间均存在显著的相关关系;表型性状的聚类分析将4种人工油松幼树种群划分为3类。
In order to study the phenotypic variation characteristics of Pinus tabuliformis seedlings in Malan Forest Region of Shaanxi Province, four artificial species planted in grassland, shrub, Betula platyphylla forest and Quercus wutaishanica forest were selected. Pinus tabulaeformis seedlings, phenotypic traits of its needles and shoots were analyzed. The results showed that seven phenotypic traits (length, width, thickness, length-width ratio, annual length of branches, base diameter and number of needles) The average phenotypic differentiation coefficient was 72.88% between populations, which was greater than 27.12% within the population, indicating that inter-population variation was the major part of the phenotypic variation in the saplings of P. tabulaeformis. The environmental differences among different populations were Pinus tabulaeformis The main reason for the phenotypic variation was phenotypic traits. The average coefficient of variation of phenotypic traits was 19.74%, and the degree of trait dispersion was the highest. Correlation analysis showed that there was a significant correlation between leaf length and leaf width and other traits. Cluster analysis of four species of artificial P. tabulaeformis seedlings into three categories.