蒙古栎树冠不同部位树枝的导管特征的变化

doi:10.11707/j.1001-7488.20141021

Abstract

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

CLC Number:

S718.45

Zhang Chaonan, Zhao Xiping, Liang Fang, Liu Gaojun, Wu Zhen, Li Weili. Variations of Vessel Characteristics of Branches in Quercus mongolica Canopy[J]. Scientia Silvae Sinicae, 2014, 50(10): 152-157.

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Variations of Vessel Characteristics of Branches in Quercus mongolica Canopy

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