热带雨林在动态植被模型中的弹性指标
Sebastian Bathiany1,2, Da Nian1,2, Markus Drüke2,3
1Earth System Modelling, School of Engineering and Design, Technical University of Munich, Munich, Germany.
Global change biology
|December 6, 2024
概括
热带森林的弹性可能受到当地生态过程的影响,而不仅仅是大规模的气候变化. 这项研究使用了植被模型来探索影响森林稳定的因素,发现人口动态和碳分配是关键因素.
科学领域:
- 地球系统科学 地球系统科学
- 生态生态学 生态生态学
- 气候科学 气候科学
背景情况:
- 热带森林,特别是亚马逊,是潜在的地球系统倾斜元素.
- 森林弹性下降可能会先于生物群转变,通过增加生物质自身相关性来表明这一点.
- 卫星数据显示了这一趋势,干旱地区的自相关性更高,但潜在的过程尚不清楚.
研究的目的:
- 使用LPJmL动态全球植被模型研究确定热带森林弹性过程.
- 了解这些过程运行的规模,并解释弹性指标中观察到的趋势.
主要方法:
- 使用了最先进的动态全球植被模型LPJmL.
- 构建了LPJmL的缩小版本,以隔离和测试特定的生态过程.
- 禁用并启用各种模型流程,以评估它们对森林弹性指标的影响.
主要成果:
- 生物质时间序列的自相关性在干燥气候中比潮湿气候更高,与观测数据保持一致.
- 这种模式与在不同的时间尺度上运行的依赖气候的人口动态有关.
- 森林弹性指标对碳分配策略敏感,特别是在压力事件期间.
结论:
- 热带森林恢复力的观察到的空间变化和趋势可以通过当地的生理和生态机制来解释.
- 这些发现表明热带森林可能通过本地适应来应对气候变化,而不是一定接近一个单一的大规模临界点.
- 已识别的过程 (人口动态,碳分配) 在当前的地球系统模型中经常被简化或缺失,突出了需要改进的领域.
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