树冠特征对小黑杨木材性质和生长量的影响研究

以小黑杨人工林为对象,研究树冠特征对木材性质和生长量的影响.结果表明:树冠特征对木材基本密度影响不显著;对抗弯弹性模量(MOE)和顺纹抗压强度影响显著,对抗弯强度(MOR)影响不显著;对纤维长度、纤维宽度以及纤维长宽比影响不大;对胸高处湿心材、边材影响极显著.MOE、MOR和顺纹抗压强度与冠幅、冠长呈负相关.线性回归方程能较好地拟合顺纹抗压强度与冠幅的关系,R2值达到0.61;纤维长度、宽度与冠幅、冠长呈一定的正相关;湿心材面积、边材面积与冠幅、冠长呈高度正相关,边材面积与冠幅间存在密切的线性关系,方程的R2值达到0.78,二次多项式方程能很好地拟合湿心材面积与冠幅的关系,R2值为0.91.

Effects Of Crown Attributes on Wood Characteristics and Increments of Populus×xiaohei

Effects of crown attributes on wood characteristics of Populus xiaohei were studied . The results indicatedthat effects of crown attributes on basic density were not significant. ForMOE and comp ression strength parallel tograin, the effects were significant, while insignificant for MOR. Crown attributes exerted little impacts on fiberlength, fiberwidth and the ratio of fiber length to width. Effects of crown attributes on sapwood and heartwood areaat breast height were highly significant. MOE, MOR, and comp ression strength parallel to grain were found to benegatively correlated with both crown width and length. In addition, the linear regression model fitted the relationship between comp ression strength parallel to grain and crown width fairlywell, with R² value of 0. 62. Fiber lengthand width, to a certain extent, were positively related to crown size. Sapwood and heartwood area were highly, positively related to crown size. Furthermore, a close linear relationship was found between sapwood area and crownwidth, with R² value of 0. 78; while a second order polynomial equation were best in describing the relationship ofheartwood area with crown width, with R² value of 0. 91.