Abstract The forest-steppe ecotone in southern Siberia is characterized by a strong dependence of tree growth on summer drought, which is expected to increase under ongoing climate change, with potential consequences for regional and global water and carbon cycles. Since climate conditions control tree secondary growth throughout the growing season, it is assumed that climate change will differently impact the formation of particular tree-ring sectors. In this study, we evaluated spatiotemporal trends in Pinus sylvestris L. tree-ring traits: tree-ring (RW), earlywood (EW) and latewood (LW) widths, as well as their climate response in order to understand potential reactions of P. sylvestris radial growth to climate change along a 4900 km longitudinal transect of increasing continentality in southern Siberia. Results indicated an increasing tree radial growth from the West to the East along the transect. Tree-ring parameters were sensitive to drought, showing a temporal delay in the climatic signals of LW (summer) relative to EW (spring). Climate control of tree growth was stronger at the western site, while it was alleviated over time in eastern sites. This study highlighted the wide plasticity of P. sylvestris to thrive within a wide range of climatic conditions, also suggesting that future drought, as predicted by climate change simulations, will potentially impact P. sylvestris growth differently along the studied gradient, being more susceptible at the western sites due to the current growth limitation.

中文翻译：

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控制西伯利亚南部大陆性增加横断面上樟子松径向生长的气候因素

摘要 西伯利亚南部森林草原交错带的特点是树木生长对夏季干旱的强烈依赖，预计在持续的气候变化下这种情况会增加，对区域和全球水和碳循环产生潜在影响。由于气候条件在整个生长季节控制着树木的二次生长，因此假设气候变化将对特定树木年轮部分的形成产生不同的影响。在这项研究中，我们评估了樟子松树轮特征的时空趋势：树轮 (RW)、早材 (EW) 和晚材 (LW) 宽度，以及它们的气候响应，以了解 P . 西伯利亚南部大陆性不断增加的 4900 公里纵向横断面，西尔维斯特的径向生长对气候变化的影响。结果表明，沿横断面从西到东，树木径向生长增加。年轮参数对干旱很敏感，表明 LW（夏季）相对于 EW（春季）的气候信号存在时间延迟。西部站点对树木生长的气候控制更强，而东部站点则随着时间的推移而减轻。这项研究强调了 P. sylvestris 在广泛的气候条件下茁壮成长的广泛可塑性，还表明未来的干旱，正如气候变化模拟所预测的那样，可能会对 P. sylvestris 的生长产生不同的影响，沿着研究的梯度，在由于目前的增长限制，西部网站。显示了 LW（夏季）相对于 EW（春季）的气候信号的时间延迟。西部站点对树木生长的气候控制更强，而东部站点则随着时间的推移而减轻。这项研究强调了 P. sylvestris 在广泛的气候条件下茁壮成长的广泛可塑性，还表明未来的干旱，正如气候变化模拟所预测的那样，可能会对 P. sylvestris 的生长产生不同的影响，沿着研究的梯度，在由于目前的增长限制，西部网站。显示了 LW（夏季）相对于 EW（春季）的气候信号的时间延迟。西部站点对树木生长的气候控制更强，而东部站点则随着时间的推移而减轻。这项研究强调了 P. sylvestris 在广泛的气候条件下茁壮成长的广泛可塑性，还表明未来的干旱，正如气候变化模拟所预测的那样，可能会对 P. sylvestris 的生长产生不同的影响，沿着研究的梯度，在由于目前的增长限制，西部网站。