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首页> 外文期刊>The Forestry Chronicle >Evaluating a single tree-based growth model for even-aged stands against the maximum size-density relationship: some insights from balsam fir stands in Quebec, Canada.
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Evaluating a single tree-based growth model for even-aged stands against the maximum size-density relationship: some insights from balsam fir stands in Quebec, Canada.

机译：针对最大年龄-密度关系评估偶龄林的单树生长模型：加拿大魁北克香脂冷杉林的一些见解。

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摘要

In this study, we addressed the issue of model evaluation when long-term monitoring data are unavailable or inappropriate. More specifically, we fitted a single tree-based growth model for pure even-aged balsam fir stands and we compared stochastic predictions with an existing maximum size-density relationship (MSDR). Growth trajectories for plots of different initial densities and diameter distributions were simulated over a 70-year period using 500 realizations for each combination of initial density-diameter distribution. Long-term predictions were consistent with the existing MSDR. The model properly reproduced the senescence phase in which the trajectories diverge from the MSDR. This phase was initiated when the average tree volume reached 0.2-0.3 m 3 per tree, which roughly corresponded to a DBH (diameter at breast height, 1.3 m from the ground) between 19 and 23 cm. Although it cannot be generalized, our case study shows that a simple single tree-based growth model with a distance-independent competition index and no stand density index can reproduce an existing MSDR. The match between long-term predictions and an existing MSDR strengthens the confidence in the biological behaviour of the model.
机译：在这项研究中，当长期监测数据不可用或不合适时，我们解决了模型评估的问题。更具体地说，我们为纯正年老的苦瓜冷杉林建立了一个基于树的生长模型，并将随机预测与现有的最大尺寸-密度关系（MSDR）进行了比较。使用初始密度-直径分布的每种组合的500个实现，在70年的时间内模拟了不同初始密度和直径分布的样地的生长轨迹。长期预测与现有的MSDR一致。该模型正确地再现了衰老阶段，在该阶段，轨迹偏离了MSDR。当每棵树的平均树木体积达到0.2-0.3 m 3时开始这一阶段，这大致相当于19到23厘米之间的DBH（胸高处的直径，距地面1.3 m）。尽管不能一概而论，但我们的案例研究表明，具有独立于距离的竞争指数且没有林分密度指数的简单的基于树的生长模型可以重现现有的MSDR。长期预测与现有MSDR之间的匹配会增强对模型生物学行为的信心。

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