树高、胸径、树皮厚对厚朴产量的影响

为研究厚朴树高、胸径和树皮厚度对其产量的影响,从而为厚朴品种选优及丰产栽培提供理论指导。采用系统抽样方法抽取了10~14 a的90个厚朴单株样本,测量其单株树高、胸径、树皮厚和树皮产量,通过建立和分析厚朴产量回归方程可知,胸径、树高和树皮厚与产量均成正相关关系;胸径、树高、树皮厚对产量的直接影响从大到小依次为胸径、树高、树皮厚,其中胸径对产量的影响以直接影响为主,树高对产量的间接影响稍高于直接影响,其间接影响主要是通过胸径对产量产生影响,树皮厚主要通过胸径和树高对产量产生间接影响,直接影响较小。

Effects of tree height,diameter at breast height and bark thickness on yield in Magnolia officinalis

In order to research effects of tree height,diameter at breast height and bark thickness on yield in Mangnolia officinalis,so as to provide some theoretical guidances for cultivar optimization and high-yield cultivation of M.officinalis,90 M.offcinalis individual samples at 10-14 years old were drawn by means of systematic sampling,tree height,diameter at breast height,bark thickness and bark yield were measured,and regression equations of yield of M.officinalis were established and analyzed.The results showed that diameter at breast height,tree height and bark thickness all had positive correlations with yield;based on effects on yield from high to low,the order of the factors were diameter at breast height,tree height and bark thickness,respectively.Among which diameter at breast height mainly had a direct effect on yield,the indirect effect of tree height on yield was slightly higher than its indirect effect,the main indirect effected was produced by diameter at breast height,and bark thickness had an indirect effects on yield through the effects of diameter at breast height and tree height,but bark thickness has a small direct impact.