野生Coffea canephora树叶功能特征和使用水效率在刚果盆地森林的空间和世纪规模的时间变化
Yves Hatangi1,2,3,4, An-Sofie Tas3,5, Jonas Depecker5
1Department of Botany, University of Kisangani, Kitima 4, 2012 Kisangani, DR Congo.
Annals of botany
|November 21, 2025
概括
这项研究揭示了Coffea canephora的叶子特征和用水效率在过去一个世纪中发生了变化,这对热带森林适应气候变化的影响.
科学领域:
- 生态生态学 生态生态学
- 植物学 植物学
- 气候变化科学 气候变化科学
背景情况:
- 植物的功能特征和内部用水效率 (iWUE) 对于了解植物对环境变化的反应至关重要.
- 刚果盆地的森林是Coffea canephora的宿主,这是一个具有生态意义的广泛分布的地下植物物种.
研究的目的:
- 为了研究Coffea canephora的叶子形态和生理特征的时空变化.
- 分析iWUE的百年级趋势及其与环境驱动因素的关系.
主要方法:
- 利用了来自两个不同的时期 (1900-1960年和2016-2021年) 的179个草原样本.
- 测量了特定叶面积 (SLA),口腔大小 (S),口腔孔径大小 (SPS),口腔密度 (SD) 和最大口腔导电量 (gcmax).
- 分析稳定的碳 (δ13C) 和氧 (δ18O) 同位素以推断光合作用活性和iWUE.
主要成果:
- 观察到叶子特征和iWUE的显著时空变化.
- 在过去的一个世纪中,SLA和S增加,而SPS,SD,gcmax,δ13C和iWUE下降.
- 形态特征显示长期适应,而生理特征对短期驱动因素作出反应,表明功能脱.
结论:
- 基于草本的多样性分析对于重建长期植物反应是有价值的.
- 这些发现突出了热带地下树种的气候敏感性和未来气候变化下的潜在限制.
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