ABSTRACT A new stand-level growth and yield model, consisting of component equations for stand volume, basal area, survival, and dominant stand height, was developed from a dataset of long-term trials for managed thinned and unthinned even-aged Norway spruce (Picea abies (L.) Karst.) forests in Norway. The developed models predict considerably faster growth rates than the existing Norwegian models. Further, it was found that the existing Norwegian stand-level models do not match the data from the thinning trails. The significance of thinning response functions indicated that thinning increases basal area growth while reducing competition related mortality. No significant effects of thinning were found in the dominant stand height growth. Model examination by means of cross-validation indicated that the models were unbiased and performed well within the data range. An application of the developed stand-level model highlights the potential use for these models in comparing different management scenarios.

中文翻译：

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挪威间伐和未间伐管理的挪威云杉林的林分生长和产量模型

摘要 一个新的林分生长和产量模型，由林分体积、基面积、存活率和主要林分高度的分量方程组成，是从管理间伐和未间伐均匀老化挪威云杉的长期试验数据集开发的。 Picea abies (L.) Karst.) 森林在挪威。开发的模型预测的增长率比现有的挪威模型快得多。此外，发现现有的挪威站级模型与来自细化路径的数据不匹配。间伐反应函数的重要性表明，间伐增加了基底面积的增长，同时降低了与竞争相关的死亡率。在主要林分高度增长中没有发现间伐的显着影响。通过交叉验证的模型检查表明模型是无偏的并且在数据范围内表现良好。开发的标准模型的应用突出了这些模型在比较不同管理方案中的潜在用途。