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六盘山不同降水梯度华北落叶松径向生长对气候因子的响应

Responses of Radial Growth of Larix principis-rupprechtii to Climate Factors Along Different Precipitation Gradients in Liupan Mountain

  • 摘要:
    目的 了解不同降水梯度下华北落叶松的生长趋势及其对气候变化的敏感性和适应性,为未来气候变化下华北落叶松人工林的经营与管理提供科学依据。
    方法 沿六盘山地区自北向南形成的降雨梯度,按照树木年轮学方法采集和处理样芯,采用Pearson相关分析和滑动相关分析方法,研究不同降水梯度华北落叶松径向生长与气候因子之间的相关性及长期动态变化关系。
    结果 不同降水梯度华北落叶松对气候因子的响应存在差异。低降水区叠叠沟(DDG)树木生长与上一年夏季温度存在显著负相关性(p<0.05),中高降水区水沟(SG)和后马场(HMC)树木生长对温度的敏感性较弱,但春季低温会抑制华北落叶松的生长。
    结论 低降水地区降水减少和气温升高对树木生长的双制约作用逐渐凸显,中高降水地区生长季降水增多加剧遮阴效应,对树木的生长由促进作用转变为抑制作用;未来气候持续变暖背景下,温度升高将会进一步加剧干旱抑制低降水地区树木生长,而高降水地区树木生长则会呈现促进趋势。

     

    Abstract:
    Objective To understand the growth patterns of Larix principis-rupprechtii across different precipitation gradients, as well as its sensitivity and adaptability to climatic shifts, we aimed to provide important insights for the management and conservation of Larix principis-rupprechtii plantations under future climate change scenarios.
    Method Samples were collected along the precipitation gradient from north to south in the Liupan Mountains and processed with dendrochronological methods. Pearson correlation and moving correlation analyses were conducted to study the relationships and long-term dynamics between radial growth and climate factors across different precipitation gradients.
    Result The response of Larix principis-rupprechtii to climatic factors varied significantly across precipitation gradients. In the low precipitation region of Diediegou (DDG), tree growth exhibited a significant negative correlation with the temperature of the previous summer (p< 0.05). In contrast, in medium-to-high precipitation regions of Shuigou (SG) and Houmachang (HMC), tree growth exhibited lower sensitivity to temperature fluctuations. However, low spring temperatures could inhibit the growth of Larix principis-rupprechtii.
    Conclusion In low precipitation region, the dual constraints of reduced precipitation and increased temperature on tree growth are gradually becoming prominent. In medium-to-high precipitation regions, the shading effect caused by increased precipitation during the growing season shifts from promoting to inhibiting tree growth. As climate warming continues, rising temperatures may further aggravate drought and inhibit tree growth in low precipitation region, while accelerating tree growth in high precipitation region.

     

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