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Modelling Bark Thickness of Norway Spruce (Picea abies Karst)

机译：挪威云杉（Picea abies Karst）的树皮厚度建模

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Background and Purpose: Bark thickness and its share in the volume of roundwood are the most important characteristics of the bark, particularly in the process of timber harvesting, and during scaling of processed logs. Therefore it is very important to have at disposal relatively accurate data regarding these characteristics of bark for particular tree species. The main goal of this paper is to investigate the thickness of the bark and its share in the volume of roundwood of Norway spruce. Materials and Methods: The research was carried out in the area of the Canton 10 of the Federation of Bosnia and Herzegovina and it encompassed 393 trees of Norway spruce from 10 cm to 115 cm of thickness at breast height. Measuring of the mean diameter and double thickness of bark was conducted by section method. In total, 4,647 diameters and bark thicknesses were measured in different relative lengths of stems or in average 10.6 measurements per one stem. Results: As an optimal model for the evaluation of double thickness of the bark of Norway spruce depending on mean diameter of roundwood the function with designated determination coefficient of 0.7142 was selected. The obtained results have confirmed the previously defined relations of investigate characteristics, which are as following: a) with the increase of mean diameter of roundwood (section) double bark thickness is increased from 9.26 mm (thickness class 12.5 cm) to 31.65 mm (thickness class 92.5 cm); b) with the increase of mean diameter of roundwood the share of bark in its volume decreased from 14.26% (thickness class 12.5 cm) to 6.73% (thickness class 92.5 cm). Conclusions: By the actual method of estimating bark thickness or the share of bark in the volume of roundwood of Norway spruce in the forestry of the Federation of Bosnia and Herzegovina a significant error was created which increases with the increase of mean diameter. The obtained results point to the necessity of investigation of these bark characteristics in Bosnia and Herzegovina and represent an inevitable starting point for making adequate tables of bark thickness and its percentage share in the volume of roundwood of Norway spruce.
机译：背景与目的：树皮的厚度及其在圆木中的份额是树皮的最重要特征，尤其是在木材采伐过程中以及在加工原木的过程中。因此，掌握有关特定树种的树皮这些特性的相对准确的数据非常重要。本文的主要目的是研究树皮的厚度及其在挪威云杉圆木中的份额。材料和方法：这项研究是在波斯尼亚和黑塞哥维那联邦第10州的地区进行的，它涵盖了挪威的393棵云杉树，在乳房高度处厚度从10厘米到115厘米不等。树皮的平均直径和两倍厚度的测定通过截面法进行。在不同的茎相对长度或每一个茎平均10.6个测量值中，总共测量了4,647个直径和树皮厚度。结果：作为评估挪威云杉树皮双倍厚度的最佳模型，取决于圆木的平均直径，选择了指定测定系数为0.7142的函数。获得的结果证实了先前定义的研究特征之间的关系，这些关系如下：a）随着圆木（截面）平均直径的增加，双树皮厚度从9.26毫米（厚度等级12.5厘米）增加到31.65毫米（厚度） 92.5厘米）; b）随着圆木平均直径的增加，树皮在其体积中的份额从14.26％（厚度等级12.5厘米）降低到6.73％（厚度等级92.5厘米）。结论：通过估算波斯尼亚和黑塞哥维那联邦林业中挪威云杉的树皮厚度或树皮在圆木中所占份额的实际方法，产生了明显的误差，该误差随着平均直径的增加而增加。获得的结果表明，有必要对波斯尼亚和黑塞哥维那的这些树皮特性进行研究，这是制作足够的树皮厚度表及其在挪威云杉圆木量中所占百分比的必然起点。

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