不同生长优势等级云南松针叶表型多样性分析

Needles Phenotypic Diversity Analysis in Different Dominance Hierarchies of Pinus yunnanensis

为了充分了解云南松种质资源的遗传多样性,以林分内优势木、中等木和劣势木3类不同生长优势等级的云南松为研究对象,对其进行针叶表型性状的调查和分析。结果表明:云南松针叶性状变异比较丰富,林冠层优势木7个针叶性状变异系数波动于13.28%~20.74%,平均16.96%;中等木波动于14.56%~20.00%,平均16.87%;劣势木的变化于13.41%~17.79%,平均15.58%。林冠层优势木7个针叶性状的Shannon-Wiener指数变化于1.342 4~1.427 0,平均为1.399 5;中等木变化于1.357 1~1.432 9,平均为1.394 1;劣势木为1.340 5~1.443 4,平均为1.412 7。不同生长优势等级间变异系数和Shannon-Wiener指数的差异不明显,云南松各针叶性状平均表型分化系数均较低,平均9.85%,组间方差分量(6.67%)远低于组内方差分量(51.90%),组内变异是云南松针叶表型变异的主要来源。综合来看,不同生长优势等级对云南松针叶表型多样性的影响较小。

In order to fully understand the genetic diversity of Pinus yunnanensis germplasm resources, P.yunnanensis, which has different growth stages of dominant wood, medium wood and inferior wood, was used as the research object to investigate and analyze the phenotypic traits of needles. Results show that the coefficients of variance(CV) of 7 traits are 13.28-20.74% with an average of 16.96% in the dominant trees, 14.56-20.00% with an average of 16.87% in the intermediate trees and 13.41-17.79% with an average of 15.58% in the suppressed trees, respectively. The Shannon-Wiener’s diversity index of 7 traits are 1.342 4-1.427 0 with an average of 1.399 5 in the dominant trees, 1.357 1-1.432 9 with an average of 1.394 1 in the intermediate trees and 1.340 5-1.443 4 with an average of 1.412 7 in the suppressed trees, respectively. There are no significant differences for the coefficient of variance and Shannon-Wiener’s diversity index based on the analysis of variance. The mean coefficient of phenotypic differentiation is low(9.85%), and the percentage of variance components between group(6.67%) is lower than the percentage of variance components within group(51.90%), indicating that the variance within group was the main source of the phenotypic variation of the species. The phenotypic diversity of needles of P.yunnanensis is less affected by the different dominance hierarchies. Taken together, the different growth dominance levels have little effect on the phenotypic diversity of P. yunnanensis.