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当前位置: 首页 > 文章 > 蒙古栎树冠不同部位树枝的导管特征的变化 林业科学 2014,50 (10) 156-161
Position: Home > Articles > Variations of Vessel Characteristics of Branches in Quercus mongolica Canopy Scientia Silvae Sinicae 2014,50 (10) 156-161

蒙古栎树冠不同部位树枝的导管特征的变化

作  者：
张超男;赵西平;梁芳;刘高均;吴珍;李伟丽
单  位：
河南科技大学林学院
关键词：
蒙古栎;导管特征;树枝;解剖
摘  要：
导管是植物体内运输水分的主要管道分子,其尺寸和数量直接影响水分运输的效率和栓塞脆弱性。一般认为,导管直径随年轮年龄的增加呈增加的趋势(石雷等,2008;黄荣凤等,2005;Lintunen et al.,2010),沿着水分运输路径导管直径逐渐细化(方群等,2013;范泽鑫等,2005)。导管直径越大,其比导率越大,且在树冠基部往上呈显著降低(范泽鑫等,2005)。多数研究表明,栓塞脆弱性与导
译  名：
Variations of Vessel Characteristics of Branches in Quercus mongolica Canopy
作  者：
Zhang Chaonan;Zhao Xiping;Liang Fang;Liu Gaojun;Wu Zhen;Li Weili;Forestry College,Henan University of Science and Technology;
关键词：
Quercus mongolica;;vessel characteristics;;branches;;anatomical
摘  要：
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.

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