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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．
For the same site index of Hunan Province (18), five 17.5-year-old Pinastaeda L. short-period industrial woods of 1.3, 3.6, 5.6, 7.6 and 9.6m5 were planted Shrinkage coefficient, basic density, growth wheel width, latewood rate and microfibril angle, according to the growth wheel sampling, were measured and statistical analysis. The results showed that the chord, radial, volumetric shrinkage coefficient and dry shrinkage ratio all reached significant levels at five altitudinal levels. The height shrinkage coefficients were significantly correlated with the age of growth ring Distance) and significant linear correlations with the above major structural factors, and the correlation degree decreases with the height of the trunk.