中国南亚热带人工林栲树木材物理力学性质分析与评价OA

To investigate wood properties and utilization prospect of Castanopsis fargesii,wood samples from 16-year-old C.fargesii plantations in South Subtropical China were collected to determine major physical and mechanical properties.Two-way analysis of variance(two-way ANOVA)was used to analyze the variation of wood properties among individual trees and along trunk height,and membership function method combined with cluster analysis was adopted for comprehensive evaluation of wood properties.The results showed that the basic density and air-dry density of C.fargesii wood were 0.439 g·cm-3 and 0.518 g·cm-3,respectively.The tangential,radial and volumetric air-dry shrinkage rates were 4.4%,1.7%and 6.2%,with differential shrinkage of 2.8 and volumetric shrinkage coefficient of 0.433%.The maximum water absorption rate reached 159.1%.Modulus of elasticity in bending,bending strength and compressive strength parallel to grain were 12.00 GPa,84.5 MPa and 42.2 MPa,respectively.The hardness of end,tangential and radial surfaces was 3 208 N,2 533 N and 2 540 N correspondingly.Variations in wood physical and mechanical properties among individual trees were greater than those along trunk height,and the heritability of all wood property traits exceeded 0.9,providing fundamental materials for breeding superior germplasm resources.Sample tree No.5 with high comprehensive wood proper-ty evaluation value was clustered together with Castanopsis hystrix,and it possessed favorable dimensional stability.