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对比植物对北半球复合温度和湿度极端的反应
Liyan Huang1, Kairong Lin2, Zeyu Yao1
1State Key Laboratory for Tunnel Engineering, School of Civil Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Journal of environmental management
|February 23, 2025
概括
复合极端事件 (CEs) 显著影响植被,不同类型的事件影响不同的地区和生物群. 了解这些不同影响对于生态系统管理和气候变化适应至关重要.
科学领域:
- 生态与气候科学 生态与气候科学
- 植被动态和遥感 植物动态和遥感
背景情况:
- 气候变化正在增加复合极端事件 (CE) 的频率,挑战生态系统健康和植被生产力.
- 研究主要集中在单个事件或复合热干旱 (CHD) 事件上,忽视了其他CE,如复合热湿 (CHW),冷干旱 (CCD) 和冷湿 (CCW).
- 了解各种CE对植被的不同影响对于有效的生态管理至关重要.
研究的目的:
- 研究四种类型的CE (CHD,CHW,CCD,CCW) 对北半球 (1982-2022) 的植被异常的影响.
- 分析植被对不同CE的空间模式和生物群特异性脆弱性.
- 加强对CE对生态系统的多方面的影响的理解,以制定减缓战略.
主要方法:
- 在生长季节利用卫星衍生的植被异常 (SkNDVI<0).
- 采用基于葡萄的条件概率方法来评估CE的影响.
- 从1982年到2022年,分析了北半球 (0°-90°N) 的数据.
主要成果:
- 在植被对不同CEs的反应中出现了明显的空间模式.
- 复合热干旱 (CHD) 和冷干旱 (CCD) 严重影响了美国西部和埃塞俄比亚的植被.
- 加拿大,东北欧洲和中欧亚洲对CCD和冷湿 (CCW) 事件的脆弱性增加.
- 干旱/半干旱地区的草原和灌木受到CHD和CCD的影响;潮湿地区的森林对CCD和CCW做出了更好的反应.
结论:
- 不同的CE具有独特的空间足迹,并在各种气候区和生物群中对植被产生影响.
- 干旱/半干旱地区的植被对干旱相关的CE特别敏感,而森林更容易受到冷湿条件的影响.
- 结果为有针对性的保护和气候适应战略提供了关键的见解,以减轻CE对生态系统的不利影响.
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