【摘要】 对湖南同一立地指数（１８）下，５株１７．５年生的火炬松（ＰｉｎａｓｔａｅｄａＬ．）短周期工业材１．３，３．６，５．６，７．６，９．６ｍ５个高度的木材干缩系数、基本密度、生长轮宽度、晚材率和微纤丝角度，按生长轮取样，进行了测量和统计分析．结果表明，弦向、径向、体积干缩系数和干缩比，在树于５个高度之间的差异，均达到了显著水平；各高度干缩系数与生长轮的年龄（离髓心的距离）以及与上述各主要构造因子之间呈显著的线性相关，且相关度度随树干高度的增加而减弱．更多还原

【Abstract】 The shrinkage coefficient, basic density, ring width, latewood percentage and microfibrillar angles of five short-period Pinus taeda L. trees (17. 5-year, site index 18) at the height of 1. 3m, 3. 6m, 5. 6m, 7. 6m, 9. 6m have been determined by means of sampling along the growth ring. The statistical analysis of the surveying data has been conducted. The results show that the differences among the five different stem heigths’ tangential shrinkage coefficient, radial shrinkage coefficient, volume shrinkage coefficient and the ratio of tangential shrinkage to radial shrinkage are significant; there are significant linear correlations among the shrinkage coefficients and the age of growth ring, and among the shrinkage coefficients and the main-structural factors at each stem height, but the correlation degree decreases with the increase of the stem height.更多还原