作　　者： ; ; ;

机构地区： 国家林业局调查规划设计院

出　　处： 《林业科学》 2003年第2期14-20,共7页

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～ 1 0a生 )各部位的水力结构参数 :导水率 (Kh ,gm·MPa- 1 min- 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- 1 min- 1 g- 1 ,供给单位质量干叶的导水率 ) ,比导率 (Ks,gm·MPa- 1 min- 1 cm- 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 。 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 (K h, 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(K s, gm·MPa -1min -1cm -2, hydraulic conductivity per transverse sapwood area),and Huber value(HV, cm 2·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.

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

领　　域： [农业科学] [农业科学] [农业科学]