WITHIN-STEM WATER DISTRIBUTION IN LIVING TREES OF SOME CONIFERS
WITHIN-STEM WATER DISTRIBUTION IN LIVING TREES OF SOME CONIFERS
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一些针叶树活树茎内水分分布
DOI：
10.1163/22941932-90000157
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发表时间：
2006
期刊：
影响因子：
1.9
通讯作者：
R. Nakada
中科院分区：
文献类型：
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作者：
R. Nakada
利用软X射线摄影技术对3个针叶科11种针叶树活体茎内水分分布进行了观测。同时测定了各树种的胸高含水量。在所有情况下，但一个边材几乎饱和的自由水。中间材是位于边材和心材之间的一条狭窄的白色带，通常常见于心材着色的树种。在心材中，水分分布不仅在种间，而且在种内，甚至在茎内都有差异。在调查的11个物种中，有7个观察到发达的湿材（心材中积累自由水的现象）。湿木的频繁出现导致的结论是，这是一个共同的特点，在某些群体的针叶树。有人认为，湿木是一种异常特征的观点可能是不正确的，因为到目前为止，湿木调查只集中在对林业重要的少数物种上，例如，硬松树为了了解湿材发育的机制，需要对属于不同物种的许多标本进行广泛的调查。
Water distributions within living stems of 11 species from three conifer families were observed with soft X-ray photography. The moisture contents at breast height of the trees were also measured. In all but one case, sapwood was almost saturated with free water. Intermediate wood, which was a narrow white band located between the sapwood and heartwood, was generally common in species with coloured heartwood. In heartwood, water distribution varied not only among species, but also within species, and even within a stem. In seven of the 11 species investigated, well-developed wetwood (the phenomenon of free water accumulated in heartwood) was observed. The frequent presence of wetwood led to the conclusion that it was a common feature in some groups of conifers. It is suggested that the view that wetwood is an abnormal feature may be incorrect because so far wetwood surveys have only focused on a few species that are important for forestry, e.g., hard pines. An extensive survey of many specimens belonging to various species is required to understand the mechanism of wetwood development.