不同湿地松种源木材材性遗传变异的研究

本文对浙江省长乐林场的湿地松 (Pinuselliottii) 18个种源的木材性质进行测定与分析。结果表明 ,种源间木材气干密度、抗弯强度、抗弯弹性模量和顺纹抗压强度差异极显著 ;管胞长度与宽度、冲击韧性差异显著 ,而管胞壁厚及胞壁率差异不显著 ;种源内木材气干密度、力学强度及胞壁率差异不显著 ,管胞长、宽和壁厚的差异均显著且高于种源间的差异。实验结果表明在种源水平上 ,进行木材气干密度、力学强度和管胞形态的种源选择 ,可取得良好的效果 ;种源内个体管胞形态 (管胞长、宽和壁厚 )变异大于种源间的差异 ,表明湿地松种源材质改良如在种源选择基础上进行个体改良会取得更好的增益。 18个种源木材管胞长度及宽度、管胞壁厚、胞壁率的广义遗传力分别为 :0 36 15、0 5 993、0 74 73、0 16 98;木材气干密度、抗弯强度、抗弯弹性模量、顺纹抗压强度与冲击韧性的广义遗传力分别为 :0 4 14 2、0 2 6 4 6、0 10 82、0 2 977和 0 12 4 6 ;种源树高及胸径的广义遗传力为 :0 4 0 5 7和 0 4 74 7;说明湿地松种源木材管胞性状、木材气干密度及树木生长性状 (胞壁率除外 )受中度或弱度遗传控制 ,通过一定强度的选择 ,能获得较高的遗传增益。本研究还从树木生长性状与管胞形态、力学强度方面对 18个种源进

GENETIC VARIATION IN WOOD PROPERTIES OF 18 PROVENANCES OF PINUS ELLIOTTII

Research was carried on the wood properties of 18 provenances of Pinus elliottii in Changle Forest Farm, Zhejiang province. The results showed that there existed significant differences among these provenances in wood air dry density, bending strength, modulus of elasticity (MOE), and compressive strength as well as toughness, tracheid length and width. In tracheid wall thickness and cell walls percentage, there were not significant differences. Meanwhile, there were not significant differences in wood air dry density, mechanical strength and cell wall percentage of intra provenance. However, the differences in tracheid length and width, and wall thickness of intra provenance were markedly higher than those of inter provenance. As a result, it was probably effective in inter provenance selection according to wood air dry density, mechanical strength and tracheid morphology, and in intra provenance selection based on the inter provenance selection with reference to tracheid morphology (tracheid length and width, and wall thickness). The broad sense heritabilities for wood tracheid length (0 3615), width (0 5993), wall thickness (0 7473), cell walls percentage (0 1698), wood air dry density (0 4142), bending strength (0 2646), MOE (0 1082), compressive strength (0 2977), toughness (0 1246), tree height (0 4057) and DBH (0 4747) of 18 provenances were calculated. These results indicated that wood tracheid, wood density and tree growth (except cell wall percentage) were under moderate or low moderate genetic control. So high genetic gains could be gained by inter provenance selection of suitable intension. In addition, this study could provide a base for the selection of pulpwood and building timber after combination evaluation of tree growth, tracheid morphology and mechanical strength.