【摘要】 于城步马尾松1.5代种子园内选择来自不同种源的无性系共10个,包括来自南岳、衡南、资兴、临武种源的无性系各2~3个,每个无性系选择20年生的样株3株,对其生长性状进行调查;同时,采集针叶和木芯样品,对其针叶和材性性状进行测定,研究其针叶性状变异及其与树体生长和木材材性的相关性。结果表明:马尾松无性系间针叶密度、二针束比率、叶干质量、叶长和小枝基径的差异均不显著;种源间针叶密度、叶干质量、叶长的差异也均不显著,但二针束比率和小枝基径的差异均达显著。随着纬度的降低,二针束比率降低,小枝基径减小,而叶长增加。针叶性状间,叶干质量与针叶密度、叶长、小枝基径均呈显著正相关,其余性状两两间相关均不显著。针叶性状与生长性状间,针叶密度与分枝角度呈极显著负相关,二针束比率与活枝数、通直度均呈显著正相关,叶干质量与枝下高呈显著负相关;叶长与冠幅呈显著正相关,与通直度呈显著负相关,其余两两间均无显著相关关系。针叶性状与材性性状间只有二针束比率与木材纵向线干缩率呈显著负相关,其余性状两两间相关均不显著。更多还原

【Abstract】 The growth characteristics of Pinus massoniana were investigated with selected of three 20-year-old plants,which belongs to two or three clones of 10 clones selected in the 1. 5 generation seed orchard of Chengbu Forest Farm from different provenances of Nanyue District,Hengnan County,Zixing City and Linwu County. The samples of needles and wood cores were collected and measured, and the variation of coniferous traits and its correlation with tree growth and wood properties were analyzed. The results showed that: the differences of needle leaf density,two needle beam ratio,dry leaf quality,needle length and branch base diameter were not significant. The differences of needle leaf density,dry leaf quality and leaf length were not significant,but the difference of two needle ratio and branch base diameter were all significant in different provenances. With the decrease of latitude,the two needle beam ratio and branch base diameter decreased, while leaf length increased. Among needlecharacteristics,the dry leaf quality was positively correlated with needle leaf density,leaf length and branch base diameter,while no significant correlation was found between the other two characteristics. There was a significant negative correlation between the needle characteristics and the growth characteristics,and between the needle leaf density and the branch angle. The two needle beam ratio was significantly positively correlated with the number of living branches and the straightness,and the dry leaf quality was significantly negatively correlated with the height of the branch. The leaf length was significantly positively correlated with the crown width,and had a significant negative correlation with the straightness, and the any two characteristis had no significant correlation. There was only a significant negative correlation between the ratio of two needle beam ratio and the longitudinal shrinkage of wood between needle characteristics and wood characteristics, but no significant correlation between the any two characteristics.更多还原