气候变化和C4和C3草在一个中度干旱地草原
Robert C Anderson1, Trace E Martyn1,2, Rachel R Renne1
1Yale School of the Environment New Haven Connecticut USA.
Ecology and evolution
|August 5, 2024
概括
气候变化可能有利于怀俄明州干旱地区的C4草. 研究人员发现C4草存在,并预计C3和C4草的适用性增加,C4草显示出更大的扩张潜力.
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
- 植物社区动态 植物社区动态
背景情况:
- 预计气候变化,特别是气温上升和降水变化,将在中度干旱地区改变植物社区结构.
- 以前的研究表明,在美国西部,C4草的气候适应性增加,C3草的适应性减少.
- C4草的扩散取决于现有的C4物种作为传播源的存在.
研究的目的:
- 评估C4草作为西怀俄明州上绿河流域 (UGRB) 的传播源的存在.
- 在未来气候变化场景下,模拟C4草相对于C3草的重要性的潜在增加.
主要方法:
- 在44个地点进行了实地调查,以确定C4草的存在.
- 对35个地点的气候适应性进行了建模,使用了17个全球气候模型,两条代表性度路径 (RCPs 4.5和8.5),以及两个时间段 (中世纪和世纪末).
- 在特定的气候场景下,分析了C3和C4功能类型生物质的预测变化.
主要成果:
- 在44个调查地点中,在10个发现了C4草,证实了传播源的存在.
- 模型预测C3和C4草的气候适应性在所有情景和时间段都会增加.
- 在中世纪RCP 4.5情景下,C4草生物量显示预计中位数增加8gm−2 (21%变化),超过C3草的中位数增加 (4gm−2;5%变化).
结论:
- 预计气候变化将提高UGRB的草的气候适应性.
- C4草的存在和预计的适合性增加表明,C4草的丰富性增加的巨大潜力.
- 这些发现对了解和管理干地生态系统对气候变化的反应有影响.
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