Pilodyn评估大花序桉活立木木材基本密度

摘要

以广西东门林场33株17年生大花序桉为研究对象，测定活立木南北向Pilodyn测定值，生长锥钻取过髓心南北向木芯，木芯分为内部、中部、外部3部分测定木材基本密度，Pilodyn测定值与木材基本密度建立的回归方程。结果表明：指数函数方程拟合效果最好；Pilodyn测定值与树干外部基本密度呈极显著的负相关关系，树干外部决定系数R2值(0.568)最大，且回归方程拟合度好；Pilodyn测定值与中部基本密度呈显著的负相关关系，与内部基本密度负相关关系不显著；南向的回归方程拟合度好于北向。预测模型的建立，为今后快速无损评估活立木木材基本密度提供新的方法。%Thirty-three Eucalyptus cloezianatreeswere sampled at age 17 years in a field test located at Dongmen Forest Farm of Guangxi, pilodyn pin penetration readings were taken in bark windows located in north and south directions to align with the direction of increment core sampling for basic density, the increment core samples were cut into equidistant inner, middle and outer radial segments for basic density assessment. The results showed that the exponential function equation was the best regression equation; it was observed that very significantly negative correlations between Pilodyn penetration and outer basic density, it was the best prediction equation with the coefficient of determination (R2=0.568); there were significantly negative correlations between Pilodyn penetrations and middle basic density, negative correlations between Pilodyn penetrations and inner basic density;the predicted regression equation of south was better than the north. The predicted egression equation is a quick and non-destructive way for estimating basic density of standing trees.