Xylem water-conducting patterns of 34 broadleaved evergreen trees in southern Japan
Xylem water-conducting patterns of 34 broadleaved evergreen trees in southern Japan
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DOI：
10.1007/s00468-010-0428-7
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发表时间：
2010-06-01
影响因子：
2.3
通讯作者：
Otsuki, Kyoichi
中科院分区：
文献类型：
--
作者：
Umebayashi, Toshihiro;Utsumi, Yasuhiro;Otsuki, Kyoichi
染料注射法被用来阐明34个阔叶万年青树木生长在日本南部的木质部水分传导途径：2个半环孔，26个弥漫孔，5个径向孔和一个非导管物种。大早材船只在半环多孔物种有水分运输功能，只有在最外面的年轮，在落叶环多孔物种。另一方面，半环孔植物的小导管在许多外部年轮中维持着水分运输功能。对于其他木质部类型的物种，许多外部年轮中的许多导管具有水分运输功能。在散孔树种中，我们将年轮内的导水模式分为两种类型：d1型，水在整个区域内通过导管传播; d2型，水主要通过早材导管传播。径向多孔物种的模式与d1型相似，无导管物种的模式与d2型相似。径向孔树种的导管直径与半环孔树种的早材导管直径相似。这些结果表明，导管直径大小只是决定万年青树种水分传导途径的众多因素之一。
A dye injection method was used to elucidate the xylem water-conducting pathways of 34 broadleaved evergreen trees growing in southern Japan: two semi-ring-porous, 26 diffuse-porous, five radial-porous and one non-vessel species. The large earlywood vessels in semi-ring-porous species have a water transport function in only the outermost annual ring, as in deciduous ring-porous species. On the other hand, the small vessels in semi-ring-porous species maintain the water transport function in many outer annual rings. For the other xylem-type species, the many vessels in many outer annual rings have a water transport function. In diffuse-porous species, we categorized the water-conducting pattern within the annual rings into two types: d1 type, where water travels through vessels in the whole region; and d2 type, where water travels mainly through the earlywood vessels. The pattern in radial-porous species is similar to that in the d1 type; the pattern in non-vessels species is similar to that in the d2 type. The vessel diameter in radial-porous species is similar to that of the earlywood vessels of semi-ring-porous species. These results suggest that the conduit diameter size is only one of many factors determining the water-conducting pathways of broadleaved evergreen species.