管胞直径、胞壁厚度自髓心向外增加。
The tracheid diameter and the thickness of cell wall increase from pith to bark.
结果表明：间歇性淹水对池杉木材管胞形态的径向变异规律无影响，即不论有无间歇性淹水，池杉木材管胞长度、直径、壁厚，皆是自髓心向外呈增加趋势。
The results showed: from pith outward, the tracheid length and diameter and cell wall thickness of Taxodium ascendens wood with or without intermittent flood all increased.
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