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林业科学 ›› 2003, Vol. 39 ›› Issue (2): 14-20.doi: 10.11707/j.1001-7488.20030203

• 论文及研究报告 • 上一篇    下一篇

油松的水力结构特征

翟洪波 李吉跃 聂力水   

  1. 国家林业局调查规划设计院,北京100714;北京林业大学资源与环境学院,北京100083
  • 收稿日期:2001-05-10 修回日期:1900-01-01 出版日期:2003-03-25 发布日期:2003-03-25

THE HYDRAULIC ARCHITECTURE CHARACTER OF PINUS TABULAEFORMIS

Zhai Hongbo,Li Jiyue,Nie Lishui   

  1. Academy of Forest Inventory and Planning,State Forestry Administration,P.R.China Beijing100714;College of Resource and Environment,BFU Beijing100083
  • Received:2001-05-10 Revised:1900-01-01 Online:2003-03-25 Published:2003-03-25

摘要:

在立地条件相同或相近的情况下,分别于夏、秋2个季节(7~9月)用改良的冲洗法测定4株油松幼树(8~10a生)各部位的水力结构参数:导水率(Kh,gm·Mpa-1min-1,单位时间、单位压力梯度下的草酸溶液通过量) ,叶比导率(LSC,gm·Mpa-1min-1g-1,供给单位质量干叶的导水率) ,比导率(Ks,gm·Mpa-1min-1cm-2,单位木质部横截面积的导水率)和胡伯尔值(HV,cm2·g-1,单位质量干叶的木质部横截面积积累量)。研究表明,油松导水率的大小除受茎段直径大小的影响外,还受到茎段所在区域的影响,限速区(即分杈基部)的导水率明显低于非限速区;同时,各水力结构参数都不同程度地受到相对分枝级、冠层和方向的影响。油松叶比导率主干高于主枝,主枝高于侧枝,南向高于北向,非限速区高于限速区等水力结构特征决定了其生物学特性和耐旱的生态策略。

关键词: 油松, 导水率, 叶比导率, 比导率, 胡伯尔值, 相对分枝级, 生态策略

Abstract:

In the same or semblable planting sites, in the seasons of summer and autumn, the parameters of hydraulic architecture of four young Pinus tabulaeformis were measured in improved flushing method. The parameters were hydraulic conductivity (Kh, gm·Mpa-1min-1, the weight of oxalic acid solution through the xylem per minute and per pressure gradient),leaf specific conductivity(LSC, gm·Mpa-1min-1g-1, hydraulic conductivity per dry weight of supplied leaves),specific conductivity(Ks, gm·Mpa-1min-1cm-2, hydraulic conductivity per transverse sapwood area),and Huber value(HV, cm2·g-1, transverse sapwood area per dry weight of supplied leaves). The study indicated hydraulic conductivity was influenced not only by the stem diameter, but also by the location of stem.The hydraulic conductivity of restriction area (namely in the base of the fork) was evidently lower than that of non-restriction area. Meanwhile, every parameter of hydraulic architecture was influenced in a way by the relative ramification rate, crown layer and ramification direction. To some extent, these characters expounded the biological trait of Pinus tabulaeformis, and determined its ecology strategy of drought resistance.

Key words: Pinus tabulaeformis, Hydraulic conductivity, Leaf specific conductivity, Specific conductivity, Huber values, Relative ramification rate, Ecology strategy