Conducting pathways in north temperate deciduous broadleaved trees
Conducting pathways in north temperate deciduous broadleaved trees
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DOI：
10.1163/22941932-90000184
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发表时间：
2008
期刊：
影响因子：
1.9
通讯作者：
T. Umebayashi;Yasuhiro Utsumi;S. Koga;S. Inoue;S. Fujikawa;K. Arakawa;J. Matsumura;K. Oda
中科院分区：
文献类型：
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作者：
T. Umebayashi;Yasuhiro Utsumi;S. Koga;S. Inoue;S. Fujikawa;K. Arakawa;J. Matsumura;K. Oda
采用注射染料后的冻干样品，研究了生长在日本的44种阔叶落叶植物茎中染料上升的种间差异。染料的上升模式不同的内部和之间的环孔和弥漫孔的物种。在所有环孔树种的大早材导管中，染料仅在最外面的年轮中上升，并且内部年轮已经失去了它们的水分运输功能。轮孔树种年轮内的染料上行模式可分为3种类型：（1）染料在晚材和早材小导管中上行;（2）染料在晚材多导管中上行;（3）染料主要在晚材导管中上行。在散孔树种中，年轮内的染料上升模式也可分为3种类型：1）整个年轮内染料上升; 2）染料主要在早材导管中上升; 3）染料主要在晚材导管中上升。木质部的水分分布也研究了低温扫描电镜在三个环孔和三个扩散多孔物种，有不同的染料上升模式。除细柱柳（Salix gracilistyla）外，其他植物年轮内水分分布格局均与染料上升格局相关。在这种情况下，水分布在整个区域的年轮，虽然染料主要分布在早材。这些结果表明，环孔树种和散孔树种的水分运输功能区不同。
The interspecific variation of dye ascent in the stems of 44 broadleaved deciduous species growing in Japan was studied using freeze-dried samples after dye injection. The dye ascending pattern differed both within and between ring-porous and diffuse-porous species. In large earlywood vessels of all ring-porous species, the dye ascended only in the outermost annual ring, and the inner annual rings had lost their water transport function. The dye ascending pattern within the inner annual rings in the ring-porous species was categorized into three types: i) the dye ascended both in the many latewood vessels throughout the latewood and small earlywood vessels; ii) the dye ascended in the many vessels throughout the latewood; and iii) the dye ascended mainly in the late latewood vessels. In diffuse-porous species, the dye ascending pattern within the annual rings also was categorized into three types: i) the dye ascended throughout the annual rings; ii) the dye ascended mainly in the earlywood vessels; and iii) the dye ascended mainly in the latewood vessels. Xylem water distribution was also examined by cryo-SEM in three ring-porous and three diffuse-porous species that had different dye ascending patterns. The water distribution pattern within annual rings was correlated with the dye ascending pattern except for one diffuseporous species (Salix gracilistyla). In this case, water was distributed in the whole region of the annual rings although dye was mainly distributed in the earlywood. These results showed that the functional area of water transport within annual rings differed among ring-porous species and diffuse-porous species.