Over the last few decades – at a range of northern sites – changes in tree-ring width and latewood density have not followed mean summertime temperature fluctuations. This discrepancy sharply contrasts an earlier correlation between those variables. As the origin of this inconsistency has not been fully deciphered, questions have emerged regarding the use of tree-ring width and latewood density as a proxy in dendrochronological climate reconstructions. I suggest that temperature is no longer the most limiting factor in certain boreal areas, which might explain the observed divergence.

中文翻译：

---

温度仍然是北部北方森林生长的最大限制因素吗？

在过去的几十年中（在一系列北部地区），树木年轮宽度和晚木密度的变化并未随夏季温度的平均波动而变化。这种差异与这些变量之间的早期关联形成了鲜明的对比。由于这种不一致的根源尚未完全被破译，因此出现了有关树轮宽度和晚木密度作为树轮年代学气候重建指标的问题。我建议在某些北方地区，温度不再是最大的限制因素，这也许可以解释观察到的差异。