欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

陕西子午岭林区人工油松幼树的表型多样性

王贤,王孝安**,朱云云,邓美皎   

  1. (陕西师范大学生命科学学院, 西安 710119)
  • 出版日期:2015-11-10 发布日期:2015-11-10

Phenotypic diversity in artificial sapling populations of Pinus tabuliformis in Ziwuling Mountain.

WANG Xian, WANG Xiao-an**, ZHU Yun-yun, DENG Mei-jiao   

  1. (College of Life Sciences, Shaanxi Normal University, Xi’an 710119, China)
  • Online:2015-11-10 Published:2015-11-10

摘要: 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。

关键词: 全氮, 土壤团聚体, 有机碳, 栽培管理模式, 肥力

Abstract:

The phenotypic traits of needles and branches from four artificial sapling populations of Pinus tabuliformis were investigated in Ziwuling Mountain of Shaanxi Province, China. The saplings were planted in grassland, shrub land, under Betula platyphylla stand and Quercus wutaishanica stand. Remarkably significant differences existed in seven studied phenotypic traits (i.e. needle length, needle width, needle thickness, the length/width ratio of needles, length and diameter of currentyear branches, and the number of needles) both within and among populations. As suggested by the phenotypic differentiation coefficient (VST), the majority of phenotypic variation occurred among populations (72.88%) rather than within populations (27.12%), implying that this pattern of phenotypic variation could be largely explained by the environmental factors. There occurred a moderate dispersion degree of phenotypic traits with the mean variation coefficient (CV) of 19.74%. Significant associations were detected between any two of the phenotypic traits, except for the association between needle length and width. According to the cluster analysis, the four artificial sapling populations of P. tabuliformis could be divided into three groups.
 

Key words: total nitrogen, soil aggregate, organic carbon, cultivation practice, soil fertility