With climate change, the frequency and intensity of wet and dry events are increasing, as is the uncertainty of their impact on tree growth. There have been studies on the effects of wet and dry conditions on tree growth, but there is a lack of comparisons of tree adaptation strategies to different types of wet and dry events in heterogeneous environments. Therefore, we explored differences in the response of tree radial growth to different types of wet and dry events using data on tree ring widths of Siberian larch (Larix sibirica) in the Altai Mountains (west) and Mongolian Plateau (east) of Central Asia. The results showed that western tree radial growth was significantly negatively correlated with precipitation and Standardized Precipitation Evapotranspiration Index (SPEI), and significantly positively correlated with mean temperature. The radial growth of trees in the east was significantly and positively correlated with precipitation and SPEI, and significantly and negatively correlated with mean temperature. Trees in wet-stressed areas are less resistance to composite cold-wet events than to ordinary wet events. Trees in drought-stressed areas are less resistance to composite hot-drought events than to ordinary drought events. Trees in the wet-stressed area recovered to normal growth levels in the first year after both ordinary wet and compound cold-wet events, and trees in the drought-stressed area failed to recover after both ordinary drought and compound hot-drought events, but then experienced compensatory growth. Thus, climate warming had a positive effect on radial growth of trees in the wet-stressed areas and a negative effect on radial growth of drought-stressed trees. Forest management should be based on the different adaptation strategies of larch to climatic stresses in heterogeneous environments.

中文翻译：

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西伯利亚落叶松比干旱胁迫地区更适应胁迫


随着气候变化，潮湿和干燥事件的频率和强度不断增加，它们对树木生长影响的不确定性也在增加。已经有关于潮湿和干燥条件对树木生长影响的研究，但缺乏树木适应策略与异质环境中不同类型的潮湿和干燥事件的比较。因此，我们利用中亚阿尔泰山脉（西部）和蒙古高原（东部）西伯利亚落叶松 （Larix sibirica） 的树木年轮宽度数据，探讨了树木径向生长对不同类型干湿事件的响应差异。结果表明：西部树木径向生长与降水量和标准化降水蒸散指数 （SPEI） 呈显著负相关，与平均温度呈显著正相关;东部乔木径向生长与降水和 SPEI 呈显著正相关，与平均气温呈显著负相关。与普通潮湿事件相比，潮湿胁迫地区的树木对复合冷湿事件的抵抗力较小。与普通干旱事件相比，干旱胁迫地区的树木对复合热干旱事件的抵抗力较低。湿胁迫区树木在普通湿胁迫和复合冷湿事件后的第一年恢复到正常的生长水平，而干旱胁迫区的树木在普通干旱和复合热干旱事件后均未恢复，但随后经历了补偿性生长。因此，气候变暖对湿胁迫地区树木的径向生长有积极影响，而对干旱胁迫树木的径向生长有消极影响。 森林管理应基于落叶松对异质环境中气候胁迫的不同适应策略。