3种人工林木材纤维特性及变异规律OA

To clarify the morphological characteristics and variation rules of wood fibers in plantation tree species with similar ages,9-year-old Phoebe zhennan,10-year-old Alnus formosana and 11-year-old Tectona grandis were selected as research materials.The longitudinal and radial gradient variations of wood fiber morphology were analyzed,and key influencing fac-tors were explored via multi-factor analysis of variance and principal component analysis.The results revealed that tree spe-cies,radial positions and tree height collectively contributed over 77%to the total variance of fiber morphology.Tree spe-cies served as the dominant factor causing fiber morphological differences,and significant interactive effects existed be-tween tree species and radial positions.A.formosana possessed longer fibers,higher length-to-width ratio and larger lumen diameter,showing prominent fast-growing characteristics.P.zhennan had the shortest and narrowest fibers with compact cell walls.Fiber properties of T.grandis fell between the above two species with stable variation ranges.With the increase of tree height,fiber length of all three wood species decreased,with the most remarkable reduction observed in P.zhen-nan.Fiber width and lumen diameter of A.formosana and T.grandis fluctuated downward,while those of P.zhennan in-creased conversely.From pith to sapwood,fiber length and length-to-width ratio increased steadily for all species.Fiber width and lumen diameter rose in A.formosana and T.grandis,whereas fiber shrinkage occurred in P.zhennan.Accord-ingly,differentiated timber harvesting and rational utilization strategies can be formulated targeting distinct tree species and wood positions.The sapwood of A.formosana is suitable for high-strength pulp production,the heartwood of P.zhennan applies to high-density materials,and T.grandis can be adopted for versatile applications.