树冠干扰的狭窄门决定了热带森林的微气候缓冲潜力
Michael J W Boyle1,2,3, Joseph Williamson4,5, Stephen J Rossiter5
1School of Biological Sciences, University of Hong Kong, Hong Kong SAR, China.
iScience
|February 20, 2026
概括
保护热带森林至关重要. 高高的树冠保护无脊椎动物免受极端高温的影响,但超过76%的树冠损失的干扰会减少这种保护,威胁到生物多样性.
科学领域:
- 生态生态学 生态生态学
- 气候变化生物学 气候变化生物学
- 保护科学 保护科学
背景情况:
- 热带森林是关键的生态系统,面临着伐木和退化的威胁.
- 扰乱的森林微气候可能变得更热,加剧气候变化影响.
- 无脊椎动物的生存与微气候的稳定性有关,特别是它们的上热极限 (CTmax).
研究的目的:
- 评估热带森林干扰和地下微气候温度之间的关系.
- 为了将森林表面温度与无脊椎动物的热耐受性进行比较.
- 为了确定树冠覆盖的门,对于维持微气候缓冲至关重要.
主要方法:
- 利用热成像来捕捉森林下层的表面温度,通过森林干扰梯度.
- 确定各种无脊椎动物群体的上热极限 (CTmax).
- 模拟未来的变暖情景 (+3°C),以评估微气候适应能力.
主要成果:
- 表面温度超过了无脊椎动物的热极限,当树冠覆盖率下降到76%以下时.
- 高度退化的森林显示,适合敏感无脊椎动物的热空间减少了22%,随着+3°C的变暖而翻一番.
- 有≥80%的树冠覆盖的场所,即使在模拟变暖的情况下,也保持了所有无脊椎动物群体的热缓冲.
结论:
- 狭窄的树冠干扰值显著降低了微气候缓冲能力.
- 保护高树冠覆盖对于保护热带生物多样性免受未来气候变化的影响至关重要.
- 保持森林完整性对于无脊椎动物在日益温暖的热带环境中生存至关重要.
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