云南50种针叶材表面视觉特性和细胞结构对总色差的影响

Surface Visual Characteristics and the Effect of Cell Structure on the Total Color Difference of 50 Species of Softwood in Yunnan Province

为探究云南常见针叶材的表面视觉特性、微观细胞结构对表面总色差(ΔE^(*))的影响,测量和计算云南50种针叶材的表面视觉物理量参数,并进行聚类分析、相关性等分析,深入研究50种针叶材表面视觉物理量的分布特征、各项视觉物理量参数之间的相关关系、微观细胞结构对ΔE^(*)影响的显著性以及不同颜色类型木材的加工利用特性。结果表明,云南50种针叶材的明度(L^(*))分布42.02~77.55,红绿色品指数(a^(*))分布7.34~18.18,黄蓝色品指数(b^(*))分布19.70~32.82,色彩饱和度(C^(*))分布23.30~34.25,色调(h°)分布55.66~73.48,a^(*)普遍较低,基本属于黄色的色调范围,除红豆杉属(Taxus)偏向深红褐色的色调。根据最远邻元素聚类算法50种针叶材主要被分为4类,第Ⅰ类为柏木属(Cupressus)、福建柏属(Fokienia)、刺柏属(Juniperus)、侧柏属(Platycladus)、白豆杉属(Pseudotaxus)、杉木属(Cunninghamia)、水杉属(Metasequoia)以及部分松科(Pinaceae)树种;第Ⅱ类为柳杉属(Taiwania)、云杉属(Picea)以及部分松科树种;第Ⅲ类为台湾杉属(Taiwania)和部分松科树种;第Ⅳ类为红豆杉属、刺柏属以及落叶松属(Larix)的怒江红杉(Larix speciosa)。50种针叶材视觉物理量的L^(*)、h°分别与a^(*)之间呈显著的负相关;L^(*)与h°呈显著的正相关;C^(*)与b^(*)呈显著的正相关;色差参数方面,Δa^(*)、Δb^(*)分别与ΔC^(*)呈显著的正相关,Δa^(*)与色调Δh°呈显著的负相关。50种针叶材树种的轴向薄壁组织对ΔE^(*)的影响水平显著;平均管胞长度与射线管胞二者的交互作用对ΔE^(*)的影响水平显著。

To explore the surface visual characteristics,the influence of microcellular structure on the surface total color difference(ΔE^(*))of common softwood in Yunnan,the surface visual physical magnitudes of 50 species of softwood in Yunnan were measured and calculated.Cluster analysis,correlation analysis,and other methods were used to study the distribution characteristics of the surface visual physical magnitudes of 50 species of softwood,the correlation between various visual physical magnitudes,the significance of the influence of microcellular structure onΔE^(*),and the processing and utilization properties of wood with different color types.The results showed that the distribution of lightness(L^(*))of 50 species of softwood in Yunnan ranged from 42.02 to 77.55,the red-green chromaticity index(a^(*))ranged from 7.34 to 18.18,the yellow-blue chromaticity index(b^(*))ranged from 19.70 to 32.82,the color saturation(C^(*))ranged from 23.30 to 34.25,and the hue angle(h°)ranged from 55.66 to 73.48.The a^(*)value was generally low and belonged to the yellow tone range,except for the Taxus which tended to be in the dark reddish-brown tone range.According to the furthest neighbor clustering algorithm,50 species of softwood were mainly divided into 4 categories.Class I includes Cupressus,Fokienia,Juniperus,Platycladus,Pseudotaxus,Cunninghamia,Metasequoia,and some Pine species.ClassⅡincludes Taiwania,Picea,and some Pine species.ClassⅢincludes Taiwania and some Pine species.ClassⅣincludes Taxus,Juniperus,and Larix from the Larix speciosa.There was a significant negative correlation between L^(*)and a^(*),h°and a^(*).There was a significant positive correlation between L^(*)and h°,C^(*)and b^(*).As for color difference parameters,Δa^(*)andΔb^(*)were significantly positively correlated withΔC^(*)respectively.Δa^(*)was significantly negatively correlated withΔh°.The influence of the axial parenchyma onΔE^(*)was significant,and the interaction between the average tracheid length and ray tracheids was significant.