Strain Changes on the Inner Bark Surface of an Inclined Coniferous Sapling Producing Compression Wood
Strain Changes on the Inner Bark Surface of an Inclined Coniferous Sapling Producing Compression Wood
复制标题
倾斜针叶树苗压缩木内皮表面应变变化
DOI：
10.1515/hf.2000.112
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
T. Okuyama
中科院分区：
文献类型：
--
作者：
Masato Yoshida;O. Yamamoto;T. Okuyama
摘要利用应变计连续测量了生长室中生长的柳杉幼树内树皮上的切向应变。人工倾斜诱导压缩木的形成。切向应变在生长室中的光/暗周期的日变化不同于在现场观察到的。总应变每天增加，在黑暗期间逐渐增加，在光照下减少，如在现场观察到的。在生长室中，无论是关灯还是开灯，应变都呈现出先急剧上升后迅速下降的变化趋势，在倾斜状态下，树干下侧的应变上升幅度大于上侧，而黑暗状态下的应变上升幅度和光照状态下的应变下降幅度都是下侧大于上侧。内树皮表面上的切向应变的变化来自于分化细胞体积的变化，对应于膨压变化和细胞壁伸展性变化。因此，分化为压缩材的管胞比分化为正常材的管胞表现出更多的夜间扩张和白天收缩。
Summary The tangential strain on the inner bark of Cryptomeria japonica saplings grown in a growth chamber was continuously measured using strain gauges. Compression wood formation was induced by artificial inclination. The diurnal changes in tangential strain during light/dark cycles in the growth chamber differed from those observed in the field. The total strain increased daily, increasing incrementally during dark periods and decreasing in the light, as observed in the field. In the growth chamber, however, steep increases and rapid decreases in strain were found immediately following lights-off and lights-on. In the inclined saplings, the strain increased more on the lower side of the stem than on the upper side; and the increment of the strain in the dark and the decrement in the light were larger on the lower side than on the upper side. The change in tangential strain on the inner bark surface arises from changes in the volume of differentiating cells, corresponding to turgor pressure changes and cell-wall extensibility changes. Therefore, the differentiating tracheids into compression wood appear to expand at night and shrink in the daytime more than the differentiating tracheids into normal wood.