The survival and mortality of conifer trees in response to climate change, particularly drought stress, have received considerable attention. However, it is crucial to explore the growth dynamics of the same conifer species in response to climate change in different climatic habitats. In this study, we aimed to quantify variations in the radial growth processes of conifer species, analyze their resilience during drought periods under different climatic habitats, and assess the impact of climate adaptation on conifer growth. We focused on two conifer species, Picea crassifolia (spruce) and Pinus tabuliformis (pine), which are distributed in both a humid habitat and a dry habitat in the northeastern Tibetan Plateau. Growth and resilience dynamics were identified across both climatic habitats and the contributions of temperature and moisture to the growth of the two species were simulated under drought stress using the VS-oscilloscope model. Spruce growth exhibited significant variability between climatic habitats. Specifically, the spruce growth rate declined in response to drought in the dry habitat (−0.91 ​cm2 per decade, p ​< ​0.01). In contrast, pine growth remained relatively stable (humid habitat: −0.03 ​cm2 per decade; dry habitat: 0.25 ​cm2 per decade, p ​> ​0.01), although it still responded to stress during the growing season (p ​< ​0.05). Furthermore, spruce displayed reduced resistance during stress in dry habitats (−30.11%), while pine exhibited an enhanced recovery of growth rates to ensure survival (+39.62%). The climate adaptation strategies of the species were linked to the contribution of temperature and moisture to their growth rates. Moisture is critical for the growth recovery of both conifers in dry habitats when temperature-associated growth displays a ‘bimodal’ pattern during the growing season. These findings have significant ecological implications for understanding conifer forest processes in the context of global climate change.

中文翻译：

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气候栖息地调节两种针叶树响应气候变化的径向生长敏感性


针叶树应对气候变化，特别是干旱胁迫的生存和死亡受到了相当大的关注。然而，探索同一针叶树物种在不同气候栖息地响应气候变化的生长动态至关重要。在这项研究中，我们旨在量化针叶树物种径向生长过程的变化，分析它们在不同气候生境下干旱期间的恢复力，并评估气候适应对针叶树生长的影响。我们重点研究了两种针叶树种，云杉（云杉）和油松（松树），它们分布在青藏高原东北部的潮湿生境和干燥生境中。确定了两种气候栖息地的生长和恢复力动态，并使用 VS 示波器模型模拟了温度和湿度对干旱胁迫下两个物种生长的贡献。云杉生长在气候栖息地之间表现出显着的差异。具体来说，云杉的生长速率因干燥栖息地的干旱而下降（每十年 -0.91 cm2，p < 0.01）。相比之下，松树的生长保持相对稳定（潮湿栖息地：每十年 -0.03 cm2;干燥栖息地：每十年 0.25 cm2，p > 0.01），尽管它在生长季节仍然对压力做出反应 （p < 0.05）。此外，云杉在干燥栖息地的胁迫下表现出降低的抵抗力 （-30.11%），而松树表现出增强的生长速率恢复以确保生存 （+39.62%）。该物种的气候适应策略与温度和湿度对其生长速率的贡献有关。 水分对于两种针叶树在干燥栖息地的生长恢复至关重要，因为与温度相关的生长在生长季节呈 “双峰 ”模式。这些发现对于在全球气候变化背景下理解针叶林过程具有重要的生态学意义。