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<p>To identify the key climatic factors influencing the radial growth of <i>Picea schrenkiana</i> across altitudinal gradients in the Tianshan Mountains, and to assess the species’ ecological resilience and growth decline in response to extreme drought events, this study selected eight sampling sites at different elevations. Tree-ring width chronologies were developed for each site to examine the relationships between growth patterns and climatic variables. Growth decline was evaluated based on the percentage change in radial growth, while ecological resilience was quantified using resistance and resilience indices. The results indicate that drought is the primary factor limiting the growth of <i>P. schrenkiana</i>. Tree growth responses to temperature and precipitation are strongly elevation-dependent, with high-elevation populations being temperature-sensitive and low-elevation growth limited by water availability. Growth decline was widespread across the region, particularly in low-altitude areas, during 1982–1984 and 2001–2007. Ecological resilience to extreme drought varies with altitude: resistance is greatest at mid-altitudes, followed by high altitudes and then low altitudes, while recovery is greatest at low altitudes, followed by high altitudes and mid-altitudes. This study enhances our understanding of the response mechanisms of <i>P. schrenkiana</i> to climate change across diverse habitats, providing a scientific basis for predicting the impacts of future extreme climate events and informing regional forest management.</p>

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Drought adaptability and growth differences of trees along an altitudinal gradient in Tianshan Mountains, China

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Kailong Guo,
  • Tongwen Zhang,
  • Shulong Yu,
  • Liulan Tian,
  • Dong Guo,
  • Kexiang Liu

摘要

To identify the key climatic factors influencing the radial growth of Picea schrenkiana across altitudinal gradients in the Tianshan Mountains, and to assess the species’ ecological resilience and growth decline in response to extreme drought events, this study selected eight sampling sites at different elevations. Tree-ring width chronologies were developed for each site to examine the relationships between growth patterns and climatic variables. Growth decline was evaluated based on the percentage change in radial growth, while ecological resilience was quantified using resistance and resilience indices. The results indicate that drought is the primary factor limiting the growth of P. schrenkiana. Tree growth responses to temperature and precipitation are strongly elevation-dependent, with high-elevation populations being temperature-sensitive and low-elevation growth limited by water availability. Growth decline was widespread across the region, particularly in low-altitude areas, during 1982–1984 and 2001–2007. Ecological resilience to extreme drought varies with altitude: resistance is greatest at mid-altitudes, followed by high altitudes and then low altitudes, while recovery is greatest at low altitudes, followed by high altitudes and mid-altitudes. This study enhances our understanding of the response mechanisms of P. schrenkiana to climate change across diverse habitats, providing a scientific basis for predicting the impacts of future extreme climate events and informing regional forest management.