在安第斯热带山脉二级森林的树木死亡率和招募,沿着3000米的海拔梯度的树木死亡率
Jenny C Ordoñez1, Esteban Pinto2, Antonella Bernardi1
1Grupo de Investigación en Biodiversidad, Medio Ambiente y Salud -BIOMAS-Universidad de Las Américas (UDLA), Quito, Ecuador.
PloS one
|March 11, 2024
概括
热带山林的动态表明,森林恢复显著影响物种死亡率和招募,在较少恢复的地区招募率更高. 这些发现对于了解森林结构和生物质周转是至关重要的.
科学领域:
- 生态生态学 生态生态学
- 森林科学 森林科学 森林科学
- 热带山区的生态系统
背景情况:
- 热带山林是重要的生态系统,但它们的死亡率和招募动态仍未得到充分研究.
- 了解这些人口统计过程是理解森林结构和生物质周转的关键.
- 提升和森林恢复显著影响森林动态,但它们的具体影响需要进一步调查.
研究的目的:
- 调查热带山林的死亡率和招募的动态,跨越一个海拔梯度.
- 确定这些人口结构过程是如何受到不同程度的森林恢复的影响.
- 描述连续森林动态及其与环境因素和恢复指标的关系.
主要方法:
- 利用了两次森林普查 (2015年和2019年) 来自16个地块,遍布厄瓜多尔安第斯山脉600-3500米以上的海拔梯度.
- 采用多变量主要组件分析 (PCA) 来描述连续森林动态.
- 应用标准线性回归和通用添加模型 (GAMs) 来探索人口统计率,海拔和森林恢复指标之间的关系.
主要成果:
- 死亡率表现出一种单模反应,在中高处达到峰值,与地表生物质生产率 (AGBp) 并无显著关系.
- 由快速生长物种主导的连续森林显示死亡率和AGBp增加,特别是在中低海拔地区.
- 森林恢复是死亡率的重要驱动因素,也是招聘的唯一预测因素,在较少恢复的地点观察到更高的招聘率.
结论:
- 森林恢复会影响哪些物种的减少,但不会改变整体死亡率.
- 招聘主要是由继任动态驱动的,较少的恢复站点呈现较高的招聘率.
- 地表生物质作为一个有用的指标,用于推断森林的连续动态,在森林中,扰乱历史是未知的.
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