白桦天然种群木材材质性状的变异与相关性

以东北5个白桦天然林种群为对象,较全面地研究了白桦木材材质性状的差异及相关性。结果表明:天然林白桦种群间木材纤维宽度、长宽比、木材基本密度、胞壁率、微纤丝角、导管比量、小拉什强度和年轮宽度差异显著或极显著;木材纤维长度、纤维壁腔比、木射线比量和纤维比量差异不显著。白桦导管比量与均温和降雨量、胞壁率和木材基本密度与经度呈显著负相关(r>0.9)。在种群间木材基本密度与胞壁率呈显著正相关(r>0.9);纤维宽度与胞壁率、纤维壁腔比、长宽比呈显著负相关(r>0.8),纤维长度与微纤丝角呈负相关(r=-0.97)。

Genetic Variation and Correlation in Wood Properties of Betula platyphylla in Natural Stands

The variation and correlation of wood properties of Betula platyphylla in five natural stands in northeast China were studied.Results show that there are significant differences in fiber width,ratio of fiber length to width,basic density,ratio of cell wall,micro-fibrillar angle,vessel-elements proportion,small tensile strength,and annual ring width of wood among the stands,but no significant differences in fiber length,fiber cell wall-lumen,and fiber and xylem ray proportion among the stands.Correlation analysis shows that there exists significant negative correlations between annual average temperature,rainfall and the vessel-elements proportion,and between cell wall ratio,wood basic density and longitude(r>0.9).For wood properties among the stands,distinct positive relationships were found between wood basic density and cell wall ratio(r>0.9),and significant negative correlations between fiber width and cell wall ratio,fiber cell wall-lumen,ratio of fiber length to width(r>0.8),and also between fiber length and microfibrillar angle(r=-0.97).