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首页> 外文期刊>Bosque (Valdivia) >Variación de la densidad de la madera y rendimiento pulpable en clones de Eucalyptus globulus evaluado con espectroscopia de infrarrojo cercano
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Variación de la densidad de la madera y rendimiento pulpable en clones de Eucalyptus globulus evaluado con espectroscopia de infrarrojo cercano

机译：用近红外光谱法评价球形桉树无性系木材密度和纸浆产量的变化

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摘要

Density variation, being the timber longitudinally measured, and the precision of spectroscopy of near infrared (NIR) were evaluated to predict density and pulp yield in two Eucalyptus globulus clones. Furthermore, variability in volume and in NIR predictions was evaluated in four E. globulus clones represented in two growth sites. Clones were selected by means of two trials: 10 and 11 year old clones in two sites from Araucanía Region, Chile. From each selected ramet, shavings samples at breast height diameter (BHD) were obtained to NIR predictions. Additionally, of a subgroup of ramets, chips samples from all the timber and six disks BHD, 20 %, 40 %, 60 %, 80 % and 100 % of commercial height were obtained. NIR predictions were contrasted with values obtained for chips and disks by means of standard error of prediction (SEP) and bias. Variance analyses of two factors (clones and sites) and correlation analyses were used. Density showed an increase from the base to the apex in both clones, though with a different variation profile; consequently, clones presented a different mean density, nonetheless their BHD was similar. NIR predictions showed an error inside the rank given for E. globulus, being those from pulp yield especially exact. Concerning volume, density and pulp yield showed low variability, both among clones and response to the site as well.
机译：评价密度变化（纵向测量木材）和近红外光谱（NIR）的光谱精度，以预测两个桉树无性系克隆的密度和纸浆产量。此外，在两个生长位点代表的四个E. globulus克隆中评估了体积和NIR预测的变异性。通过两项试验选择了克隆：来自智利Araucanía地区的两个地点的10岁和11岁克隆。从每个选定的分株，获得乳房高度直径（BHD）的刨花样本，以进行NIR预测。另外，在分株的一个子组中，从所有木材和六个圆盘BHD中获得了碎屑样品，分别为商品高度的20％，40％，60％，80％和100％。 NIR预测与通过标准预测误差（SEP）和偏差获得的芯片和磁盘的值进行对比。使用两个因素（克隆和位点）的方差分析和相关性分析。在两个克隆中，密度都显示出从基部到顶端的增加，尽管具有不同的变异特征。因此，克隆的平均密度不同，尽管它们的BHD相似。 NIR预测显示在给定的E. globulus等级内存在误差，特别是来自纸浆产量的误差。关于体积，密度和果肉产量，克隆之间以及对位点的响应均显示出较低的变异性。

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