不同萌枝类型云南红豆杉幼树生长性状及其异速关系

Growth Characters and Its Allometric Relationships of Taxus yunnanensis Saplings from Different Sprouts Types

  • 摘要: 调查分析了福建明溪4年生不同萌枝类型云南红豆杉幼树生长、性状相关性与综合指标值差异,了解萌枝类型幼树遗传变异规律;采用标准化主轴估计法分析其异速生长关系,揭示不同萌枝类型幼树的适应策略。结果表明:树干萌枝较无萌枝、树基萌枝类型显著增大幼树树高、地径,树干萌枝、树基萌枝较无萌枝类型显著增大冠幅、侧枝数和综合指标值。不同类型间幼树地径、树高与冠幅间相关性差异。无萌枝类型的地径与树高间异速生长指数均显著大于1,树基萌枝与树干萌枝类型则为等速生长;不同萌枝类型间冠幅与树高间异速生长指数均显著大于1。无萌枝与树基萌枝类型的侧枝数与树高间的异速生长指数均显著大于1,树干萌枝类型为等速生长;无萌枝较树干、树基萌枝类型显著增大侧枝数与树高间异速生长指数。不同萌枝类型间的地径与树高、冠幅与树高间具有共同异速生长指数,分别为1.150、1.658;不同萌枝类型既存在着等速生长又存在着异速生长现象。幼树生长、性状相关性在不同萌枝类型间差异显著,存在着丰富遗传变异。异速生长关系在不同萌枝类型间并不唯一,反应着不同类型幼树生长与适应策略。建议采用树基萌枝与树干萌枝类型发展紫杉烷原料林。

     

    Abstract: The growth characters and its correlation and comprehensive index value of 4-year-old Taxus yunnanensis saplings form different sprout types in Mingxi, Fujian were investigated and revealed their genetic variation, the allometric relationship was analyzed by standardized major axis analysis, and to analyze adaptive strategy of T. yunnanensis saplings from different sprouts types. The results showed that the saplings height and ground diameter of stem epicormic sprouts type were significantly higher than those of non sprouts and stem basal sprouts types, and the crown width, lateral branch number and comprehensive index value of stem epicormic sprouts type and stem basal sprouts type were significantly higher than those of non sprouts type. The correlation between saplings ground diameter, height and crown width among different types were different. The allometric exponent index of ground diameter and tree height of non sprouts type was significantly greater than 1, while growth relationships of stem basal sprouts and stem epicormic sprouts types were isometric, the allometric exponent index of crown width and tree height of different sprout types were significantly greater than 1. The allometric exponent index of lateral branches number and tree height of non sprouts and stem basal sprouts types were significantly greater than 1, while growth relationships of stem epicormic sprouts type was isometric. The allometric exponent index of lateral branches number and tree height of non sprouts type were significantly higher than those of stem epicormic sprouts and stem basal sprouts types. The ground diameter and tree height, crown width and tree height of Taxus yunnanensis different sprouts types saplings exhibited a common allometric exponent of 1.150 and 1.658, respectively. The seedlings of different sprouts types had both isometric and allometric relationships. There were significant differences on growth characters and its correlation of T. yunnanensis saplings from different sprouts types, indicating that there were abundant genetic variation.There is no consistency allometric growth relationship among different sprouts types, it represents the growth and adaptation strategies of different sprouts types saplings. It was suggested that stem basal sprouts and stem epicormic sprouts types should be adopted to develop the taxane raw material forest.

     

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