在过去的40年里,陆地生态系统在应对气候变化时增强了根区的储水能力
Qiaojuan Xi1, Hongkai Gao1, Lan Wang-Erlandsson2
1Key Laboratory of Geographic Information Science, Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China.
Science bulletin
|July 3, 2025
概括
全球根区储水能力显著增加,增强了对干旱的抵御力. 然而,一些干燥的生态系统显示下降趋势,表明气候变化下的潜在转折点.
科学领域:
- 地球和环境科学 地球和环境科学
- 生态生态学 生态生态学
- 气候科学 气候科学
背景情况:
- 生态系统的根区适应气候变化对于抗旱能力和植被生产力至关重要.
- 目前缺乏根区适应机制的全球定量评估.
研究的目的:
- 从1982年到2020年,量化评估根区储水能力 (SR) 的全球变化.
- 调查不同土地覆盖类型中SR的趋势.
- 了解这些变化对生态系统抗旱能力的影响.
主要方法:
- 分析高质量的基于观察的数据,涵盖1982-2020年期间.
- 计算全球平均SR及其随时间变化的计算.
- 对12种不同的土地覆盖类型的SR趋势的检查.
主要成果:
- 在1982年至2020年期间,全球平均SR增加了11% (从182到202毫米),总计增加了1652亿米3.
- 在12种土地覆盖类型中,SR显示了9种土地覆盖类型的增加趋势.
- 三种相对干燥的土地覆盖类型显示SR趋势下降,表明潜在的生态系统临界点.
结论:
- 根区的储水能力在全球范围内有所增加,有助于增强抗旱能力.
- 在某些干燥生态系统中,SR的减少凸显了它们的脆弱性和越过关键临界点的潜力.
- 对根区动态的考虑对于准确评估气候变化影响和干旱抵御能力至关重要.
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