Abstract We present a new predictor for the estimation of the number of missing sapwood rings in oak. It circumvents a number of problems with predictors used in traditional sapwood estimation procedures such as mean ring width or tree age. Instead, we use the mean ring width of the last 9 heartwood rings and the first sapwood ring, which mirrors the growth level during sapwood formation. We present a model to produce a 95 % prediction interval for the felling year. Our method accounts for the skewed distribution of the number of sapwood rings towards higher values.

中文翻译：

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用于边材估算的苏黎世方法

摘要 我们提出了一种新的预测器，用于估计橡木中缺失边材环的数量。它避免了传统边材估计程序中使用的预测器的许多问题，例如平均年轮宽度或树龄。相反，我们使用最后 9 个心材环和第一个边材环的平均环宽，这反映了边材形成过程中的生长水平。我们提出了一个模型来为砍伐年份产生 95% 的预测区间。我们的方法考虑了边材环数量向更高值的偏斜分布。