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Generating Virtual Even-Aged Silver Fir Stand Structure Based on the Measured Sample Plots

机译：根据测得的样本图生成虚拟的均匀年龄的银杉林分结构

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Background and Purpose: The aim of this article is to create a virtual forest stand based on the field measurement of spatially separated sample plots and to examine its credibility based on the deviation of the basic characteristics of the virtual stand as compared to the field measurements. Material and Methods: Field measurements were made on 20 circular sample plots with a 20 m radius, set on a 100x100 m grid. By using the univariate Ripley’s K function the regularity of the spatial pattern of trees was analysed. The diameter distribution and the frequencies of height within individual diameter class were mathematically fitted and used for generating the virtual stand. The whole process of generating the virtual stand was done in the R software. Area of study are even-aged silver fir stands in the Croatian Dinarides. Results: The main unit of the virtual stand is a tree, with the purpose that the virtual stand can then be used as a basis for forest stand growth simulators. The result of the research was a virtual stand of 3 ha whose characteristics only slightly differed from the field measured plots. Within the virtual stand, special emphasis has been put on tree heights, which were generated according to the variability of tree height for trees of the same diameter at breast height. Conclusions: Considering the distribution of diameters at breast height, tree heights, the number of trees, basal area and volume, the virtual stand has minimal deviations from the situation in the field and it adequately shows variability measured in the field.
机译：背景与目的：本文的目的是基于对空间上分离的样地的实地测量来创建虚拟林分，并根据虚拟林分的基本特征与实地测量之间的偏差来检验其信誉。材料和方法：实地测量是在20x半径为20 m的圆形样地上进行的，设置在100x100 m的网格上。通过使用单变量Ripley的K函数，可以分析树木的空间格局的规律性。数学上拟合了各个直径类别内的直径分布和高度频率，并将其用于生成虚拟支架。生成虚拟支架的整个过程是在R软件中完成的。研究领域是克罗地亚迪那里德斯地区的均匀年龄的银杉林。结果：虚拟林分的主要单元是一棵树，目的是可以将虚拟林分用作林分生长模拟器的基础。研究的结果是一个3公顷的虚拟林分，其特征与实地测得的地块仅稍有不同。在虚拟看台上，树高特别受重视，树高是根据胸高相同直径的树木的树高变异性而产生的。结论：考虑到胸高，树木高，树木数量，基础面积和体积的直径分布，虚拟林分与实地情况的偏差很小，并且充分显示了实地测量的可变性。

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