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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，分析了树木空间格局的规律性。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第纳里德群岛的老年白银冷杉林。结果：虚拟林的主要单元是一棵树，目的是使虚拟林可以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，其特征与实地测绘的地块仅稍有不同。在虚拟看台上，树高特别受重视，树高是根据相同直径的树木在胸高时的树木高度变化而得出的。结论：考虑胸高的直径分布，树高，数量在树木，基础面积和体积方面，虚拟林分与野外情况的偏差极小，并且充分显示了野外测量的变化性。

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