Silvicultural interventions such as strip cuttings can change the resource availability of the edge trees. This may alter tree allometry, as light regime, water, and nutrient availability can change at the forest edge. Increased root growth may optimize resource uptake and/or enhance tree anchorage to withstand the altered wind regime. However, little is known about the patterns of the root-shoot allometric responses to strip cuttings. In three alpine stands differing in climate, site productivity, and stand characteristics, we selected 71 Norway spruce trees and took increment cores from stems, root collars, and main roots. This enabled us to study changes in the long-term root-stem allometry for 46 years and short-term allometric responses to intervention. The effects of cutting were compared between edge trees and trees from the stand interior in 10 years before and after the intervention. The long-term allocation to roots increased with stem diameter, with the strongest effects on the regularly managed stand with the tallest and largest trees. These results support the allometric biomass partitioning theory, which postulates resource allocation patterns between different plant organs to depend on plant size. Strip cutting on north-facing slopes boosted edge-tree growth in all plant compartments and enhanced allocation to roots. This change in allometry started 2 years after cutting but disappeared 7-8 years later. In the post-cutting period, the highest root-shoot increase was observed in the small trees independent of the site. This indicates the change in growing conditions to have the strongest effects in formerly suppressed trees. Thus, the effect of such acclimation on the wind firmness of subdominant spruce trees is a question with high importance for optimizing cutting layouts in lowering post-cutting vulnerability to disturbance. The results from this case study contribute to a better understanding of the structural acclimation of spruce trees from high-elevation forests to new forest edges. However, for a more mechanistic understanding of environmental drivers, further analyses of tree-ring stable isotopes are recommended.

中文翻译：

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条状切割后高山挪威云杉根茎异速生长关系的变化。

林木干预措施（例如条带扦插）可以改变边缘树木的资源可用性。这可能会改变树木的异速生长，因为森林边缘的光照条件、水和养分可用性会发生变化。增加根系生长可以优化资源吸收和/或增强树木锚固以承受改变的风况。然而，对条状插条的根茎异速生长响应模式知之甚少。在气候、立地生产力和林分特征不同的三个高山林分中，我们选择了 71 棵挪威云杉树，并从茎、根环和主根中提取增量芯。这使我们能够研究 46 年长期根茎异速生长的变化和对干预的短期异速生长反应。比较干预前后10年边缘树和林分内部树木的砍伐效果。根的长期分配随着茎直径的增加而增加，对具有最高和最大树木的常规管理林分的影响最强。这些结果支持异速生长生物量分配理论，该理论假设不同植物器官之间的资源分配模式取决于植物大小。在朝北的斜坡上进行条带切割促进了所有植物隔间的边缘树生长，并增加了对根的分配。这种异速生长的变化在切割后 2 年开始，但在 7-8 年后消失。在后伐期，在独立于场地的小树中观察到最高的根茎增长。这表明生长条件的变化对以前被抑制的树木产生了最强的影响。因此，这种驯化对次优势云杉树的抗风强度的影响对于优化切割布局以降低切割后对干扰的脆弱性具有重要意义。本案例研究的结果有助于更好地了解云杉树从高海拔森林到新森林边缘的结构适应性。然而，为了更深入地了解环境驱动因素，建议对树木年轮稳定同位素进行进一步分析。本案例研究的结果有助于更好地了解云杉树从高海拔森林到新森林边缘的结构适应性。然而，为了更深入地了解环境驱动因素，建议对树木年轮稳定同位素进行进一步分析。本案例研究的结果有助于更好地了解云杉树从高海拔森林到新森林边缘的结构适应性。然而，为了更深入地了解环境驱动因素，建议对树木年轮稳定同位素进行进一步分析。