Drought stress caused by global climate warming affects tree growth in both dry and wet areas. However, the differences in tree growth responses to drought in dry and wet areas are poorly understood. Here, we collected 93 tree cores to analyze the differences in the radial growth responses of larch () under climate change and tree growth resilience under drought events in the Altai Mountains (dry area) and Changbai Mountains (wet area). The results showed that larch growth in the Altai Mountains was significantly positively correlated with the self-calibrating Palmer Drought Severity Index (sc-PDSI) in all months and precipitation in the previous growth season and May, whereas it was significantly ( < 0.05) negatively correlated with temperature in May and the previous June to August. In the Changbai Mountains, larch growth was significantly positively correlated with May maximum and mean temperature, and significantly positively and negatively correlated with precipitation in April and May，respectively ( < 0.05). The mean resistance (recovery) of larch growth to drought in wet areas were significantly stronger (weaker) than that in dry areas ( < 0.05). Moreover, strengthening the drought frequency led to a significant ( < 0.05) decline in larch resistance in dry areas. Therefore, warming-induced increases in drought stress will aggravate negative impacts on the radial growth of larch forests in temperate dry areas but not in wet areas in the future.

中文翻译：

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北温带森林干湿区落叶松径向生长对干旱事件的响应

全球气候变暖引起的干旱胁迫影响干旱和潮湿地区的树木生长。然而，人们对干旱和潮湿地区树木生长对干旱的反应差异知之甚少。在这里，我们收集了93个树芯，分析了阿尔泰山（干旱区）和长白山（湿润区）落叶松在气候变化下的径向生长响应和干旱事件下树木生长恢复力的差异。结果表明，阿尔泰山落叶松生长与各月自校准帕尔默干旱指数（sc-PDSI）、上一生长季和5月降水量呈显着正相关，与上一生长季和5月降水量呈显着负相关（<0.05）。与5月和前6月至8月的气温相关。长白山区落叶松生长与5月最高气温和平均气温显着正相关，与4月和5月降水量分别显着正相关和负相关（ < 0.05）。湿润地区落叶松生长对干旱的平均抵抗力（恢复力）显着强（弱）于干旱地区（ < 0.05）。此外，干旱频率的加强导致干旱地区落叶松抗性显着下降（<0.05）。因此，气候变暖导致的干旱胁迫加剧，未来将加剧对温带干旱地区落叶松林径向生长的负面影响，但不会加剧对湿润地区落叶松林径向生长的负面影响。