The variation of growth in diameter and its relationship with the height of pedunculated oak (Quercus Robur L.) trees in the provenance cultures

P. Cuza
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Abstract

In provenance cultures, studies were conducted on diameter growth dynamics in pedunculated oak (Quercus robur L.) trees and the height-diameter relationship was evaluated based on three data approximation models. The studies highlighted a signifi cant variation of the trunk diameter in trees of different origins and a similar growth reaction of oaks from four provenances (Hârjauca, Plaiul Fagului, Zloti, and Baimaclia) in relation to the environmental conditions of the common stand. In all the years of observation, the trees from Edineț had a rapid growth in diameter, thus demonstrating their ability to adapt through phenotypic plasticity. An uneven distribution of tree diameters was observed by provenance, indicating that dominant trees have an advantage in competition for light, slowing the growth of those with smaller diameters and causing a positive skew towards oaks with larger diameters. With the advancing age of the oaks, a tendency to decrease the values of the heritability coefficients for the trunk diameter was observed. At the age of 5 years, studies show a strong genetic control over the growth in diameter, a fact highlighted by the heritability coefficient value of 0,53 for this character. As the trees age, non-genetic factors such as environmental conditions become increasingly important in determining tree diameter growth. The comparative analysis of three statistical fitting models for data on pedunculate oak trees from different provenances, showed that the logarithmic model is the most appropriate to explain the relationship between their height and diameter.
原产地文化中有梗橡树(Quercus Robur L.)直径增长的变化及其与高度的关系
在原产地培养中,对有花梗橡树(Quercus robur L.)的直径生长动态进行了研究,并根据三个数据近似模型对高度-直径关系进行了评估。研究结果表明,不同产地的栎树树干直径存在显著差异,而来自四个产地(Hârjauca、Plaiul Fagului、Zloti 和 Baimaclia)的栎树的生长反应与共同林地的环境条件相似。在所有的观察年份中,埃迪内ț的树木直径增长迅速,从而证明了它们通过表型可塑性来适应环境的能力。根据产地观察到的树木直径分布不均匀,这表明优势树木在光照竞争中占有优势,减缓了直径较小树木的生长速度,导致向直径较大的橡树倾斜。随着橡树树龄的增加,树干直径的遗传因子值呈下降趋势。在 5 年树龄时,研究表明树干直径的增长具有很强的遗传控制能力,这一特性的遗传系数为 0.53。随着树龄的增长,环境条件等非遗传因素在决定树木直径增长方面变得越来越重要。对来自不同产地的有梗栎树数据的三种统计拟合模型的比较分析表明,对数模型最适合解释其高度和直径之间的关系。
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