<正>在影响木材密度的晚材率、胸径、木材年龄、径向生长速率和抽样点相对位置的5个因子中,晚材率是影响木材密度最重要的因子。根据晚材率可精确地估算马尾松天然林林木胸高木材密度。在包括有晚材率因子的多元回归分析中,随着所含因子的增多,估测效果并非相应地增加。所以,不能以树木常用测定性状如胸径、树高和年龄来预估胸高木材密度。

Of the five variables studied, viz, latewood percent, diameter at breast height, age of wood, radial annual growth rate and relative position of breast height of sample point, the latewood percent was found to be the most important factor, with the help of which, breast height density of wood of sample trees from natural stand of masson pine can be estimated with reasonable accuracy. In multiple regression analysis in the presence of latewood percent, estimative efficience don’t increase with the number of variables contained. The common measural characteristics can’t be used to estimate the density of wood at breast height.