Ray traits affect secondary xylem development and wood properties. Pinus massonia and Cunninghamia lanceolata, commercially important timber species, were chosen to study the differences in wood ray traits of juvenile versus mature wood. Seven ray traits, i.e., percentage of rays, ray spacing, ray number, uniseriate ray height, fusiform ray height, ray parenchyma cell length and ray tracheid length, as well as eight wood axial tissue traits, were investigated quantitatively. Intraspecific variations in ray traits and axial tissue traits between juvenile wood and mature wood were displayed in violin plots. The results showed that anatomical differences between juvenile wood and mature wood were significant for both ray traits and axial tissue traits. Juvenile wood generally possessed the larger percentage of rays, higher ray spacing and ray number, smaller ray height and shorter ray cells than mature wood. A positive correlation was present between the ray parenchyma cell length and ray tracheid length. Negative correlations of the ray number and ray spacing with uniseriate ray height were found. Additionally, the axial tracheid cell wall thickness all had Pearson’s correlations with ray spacing, ray number and ray parenchyma cell length.

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幼木和成熟木的射线性状：马尾松和杉木

射线性状影响次生木质部发育和木材特性。马尾松和杉木，商业上重要的木材种类，被选择来研究幼木与成熟木材的木射线特征的差异。定量研究了射线百分比、射线间距、射线数、单列射线高度、梭形射线高度、射线薄壁细胞长度和射线管胞长度7个射线性状，以及8种木材轴向组织性状。小提琴图显示了幼木和成熟木之间射线特征和轴向组织特征的种内变化。结果表明，幼木和成熟木在射线性状和轴向组织性状上的解剖差异均显着。与成熟木相比，幼木普遍具有较大的射线百分比、更高的射线间距和射线数、更小的射线高度和更短的射线单元。射线薄壁细胞长度与射线管胞长度呈正相关。发现射线数和射线间距与单列射线高度呈负相关。此外，轴向气管细胞壁厚度与射线间距、射线数和射线薄壁细胞长度均具有皮尔逊相关性。