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林业科学 ›› 2014, Vol. 50 ›› Issue (10): 152-157.doi: 10.11707/j.1001-7488.20141021

• 研究简报 • 上一篇    下一篇

蒙古栎树冠不同部位树枝的导管特征的变化

张超男, 赵西平, 梁芳, 刘高均, 吴珍, 李伟丽   

  1. 河南科技大学林学院 洛阳 471003
  • 收稿日期:2013-12-10 修回日期:2014-04-08 出版日期:2014-10-25 发布日期:2014-11-12
  • 通讯作者: 赵西平
  • 基金资助:

    国家自然科学基金项目"木质部输导组织的变异性及其对气候变化的响应研究"(31000265)。

Variations of Vessel Characteristics of Branches in Quercus mongolica Canopy

Zhang Chaonan, Zhao Xiping, Liang Fang, Liu Gaojun, Wu Zhen, Li Weili   

  1. Forestry College, Henan University of Science and Technology Luoyang 471003
  • Received:2013-12-10 Revised:2014-04-08 Online:2014-10-25 Published:2014-11-12

关键词: 蒙古栎, 导管特征, 树枝, 解剖

Abstract:

To study the variations of vessel anatomical characteristics in Quercus mongolica crown, vessel diameter, vessel density, vessel tissue proportion and vessel roundness of the different order branches were investigated in upper, middle and lower canopy of seven sample trees. Theoretical specific conductivity and vulnerability indices in different parts were calculated to estimate water transport efficiency and safety in the trees. The results showed that the ring age was correlated positively with vessel diameter, and was correlated negatively with vessel density and vessel roundness. With the increase of vessel diameter, the theoretical specific hydraulic conductivity and vulnerability indices increased from pith to bark. From lower canopy to upper canopy, the vessel diameter, theoretical specific hydraulic conductivity and vulnerability indices increased, the vessel density decreased, and the vessel pores were more round. With the increase of branch orders, the vessel diameter, theoretical specific hydraulic conductivity and vulnerability indices decreased, the vessel density increased.

Key words: Quercus mongolica, vessel characteristics, branches, anatomical

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