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Differential response of Qilian juniper radial growth to climate variations in the middle of Qilian Mountains and the northeastern Qaidam Basin

机译:祁连山中部和柴达木盆地东北部祁连滇径向生长对气候变化的响应差异

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摘要

Tree growth in the mid-latitudes of the northern hemisphere reveals significant inter-annual variation in carbon sequestration, and the variations have been widely attributed to climate change, especially to the recent rapid warming and increasing drought stress. However, the response of natural trees under the different regions that exist in the northeastern Qinghai-Tibetan Plateau remains unclear. Here, we use nine Qilian juniper (Sabina przewalskii) tree-ring width and basal area increment (BAI) chronologies from the middle of the Qilian Mountains and the northeastern Qaidam Basin to quantify tree growth trends and their response to the recent rapid warming. The trees, growing at high and low elevations, exhibited a consistent pattern of inter-annual variations, with increasing synchronicity in their trends since 1950. Responses to several climate factors indicate that increasing temperature accelerated tree growth in the middle of the Qilian Mountains, but restricted tree growth in the northeastern Qaidam Basin. Moving-window correlation analyses demonstrate a clearly contrasting response to the temperature variations. Our findings suggest that growth of Qilian juniper in the middle of the Qilian Mountains will increase steadily in the future rapid warming, but may remain constant or even decrease in the northeastern Qaidam Basin. These contrasting responses to temperatures provide valuable information on forest dynamics in the critical mid-latitude regions that should be incorporated into predictions of future forest carbon cycling under global warming.
机译:北半球中纬度地区的树木生长表明碳固存存在明显的年际变化,这种变化广泛地归因于气候变化,特别是最近的快速变暖和干旱压力的增加。然而,东北青藏高原不同地区对天然树木的反应尚不清楚。在这里,我们使用了从祁连山中部和柴达木盆地东北部开始的9个祁连杜鹃(Sabina przewalskii)树轮宽度和基面积增加(BAI)年表来量化树木的生长趋势及其对近期快速变暖的响应。自1950年以来,在高海拔和低海拔生长的树木均表现出一致的年际变化模式,其趋势同步性增强。对几种气候因素的反应表明,温度的升高加速了祁连山中部树木的生长,但是限制柴达木盆地东北部的树木生长。移动窗口相关性分析显示出对温度变化的明显对比响应。我们的发现表明,在未来的快速变暖中,祁连山中部的祁连杜鹃的生长将稳定增长,但在柴达木盆地东北部可能保持恒定甚至下降。这些对温度的不同响应提供了有关关键中纬度地区森林动态的宝贵信息,应将其纳入对全球变暖下未来森林碳循环的预测。

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