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Thecolor of sapwood of Chinese white poplar among trees has significant difference.
毛白杨边材材色株间存在显著差异.
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One or more layers of living and functional sapwood cells are periodically converted to heartwood.
每个生长周期都有一或多层活的边材细胞转变成心材.
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4、
Heartwood is the mature wood, which is often darker, extending from the sapwood to the pith.
心材通常是成熟的木材部分, 通常色泽较暗, 范围从边材一直到髓心.
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Sapwood is the lighter colored wood growing from inside the bark to the heartwood.
边材色泽较浅,是从树皮到新材之间的木质部分.
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边材为粉红色，心材为粉红褐色。质地统一，个别木材有图案明显的波状纹路。
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