树木或草是否会从沙原降雨模式的变化中获益?
Benjamin J Wigley1,2,3, Corli Coetsee2,3, Edmund C February4
1Plant Ecology, University of Bayreuth, Universitaetsstrasse 30, 95447, Bayreuth, Germany.
The New phytologist
|January 21, 2024
概括
草原的树木和草原面临着气候变化带来的挑战. 干旱周期的增加可能会减缓树木的生长,这可能会使草在未来的草原生态系统中比树木有优势.
科学领域:
- 生态生态学 生态生态学
- 气候变化科学 气候变化科学
- 植物生理学 植物生理学
背景情况:
- 未来的气候变化场景预测降雨变化增加.
- 草原生态系统面临着关于树木和草对季节性变化和干旱时期的反应的不确定性.
- 了解树木,草和降雨之间的现象学合对于草原生态系统动态至关重要.
研究的目的:
- 为了研究生长季干旱和干旱季降雨对萨凡纳树木和草的影响.
- 确定树木和草现象和降雨模式之间的关系.
- 评估降雨变化如何影响大草原植物群体的组成.
主要方法:
- 实地测量树木和草生长对实验性干旱和降雨操纵的反应.
- 对17种叶落木质物种的现象学事件的监测.
- 对草的土壤调整植被指数 (SAVI) 的分析.
- 现象学数据,增长反应和2019年至2023年降雨模式之间的相关性分析.
主要成果:
- 树木和草的生长受到生长季节干旱时期的显著抑制.
- 树木的生长与生长季节的土壤水潜力有很强的相关性,仅限于雨季.
- 草表现出干旱时期的快速恢复,其蒸发转化与跨季节的土壤水位潜力有关.
- 树叶冲洗在大量降雨之前开始,后来的叶子发育有限,而草在可用的水分下机会生长.
结论:
- 增长季节的频率和持续时间增加,干旱时期可能会阻碍某些草原的树木生长.
- 长长的生长季节,加上干旱时期,可能会使草比树更受欢迎.
- 在未来的气候条件下,草可能会在C3植物上获得竞争优势,C3植物受益于二氧化碳水平的提高.
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