初始植被异质性对潜水和浮动巨型植物竞争的影响
Linhao Xu1, Donald L DeAngelis2
1Department of Biology, University of Miami, Coral Gables, USA.
Mathematical biosciences and engineering : MBE
|December 19, 2024
概括
水生生态系统的空间异质性可能导致复杂的植被动态. 初始条件显著影响浮动水生植被 (FAV) 和浸水水生植被 (SAV) 之间的竞争,产生不同的稳定状态.
科学领域:
- 生态生态学 生态生态学
- 水生植物的动力学
- 生态系统建模 生态系统建模
背景情况:
- 非空间模型根据营养水平 (N) 预测浮动水生植被 (FAV) 或浸水水生植被 (SAV) 的稳定状态.
- 这些模型表明,在中间营养水平上存在替代稳定状态,由S形分支曲线描述.
- 水体的物理异质性可以平滑非空间模型预测的急剧过渡.
研究的目的:
- 检查异质初始条件对浮动水生植物 (FAV) 和潜水水生植物 (SAV) 之间的竞争的影响.
- 研究空间分布和初始生物质比如何影响水生植物群落的稳定平衡.
- 采用空间显式方法,模拟藻 (Lemna gibba) 和藻 (Elodea nuttallii) 之间的竞争.
主要方法:
- 使用空间显式模型模拟Lemna gibba (FAV) 和Elodea nuttallii (SAV) 之间的竞争.
- 这两种植被类型在模型细胞中的初始生物量和空间分布多样化.
- 随着时间的推移,模拟了营养水平 (N) 的逐渐变化,以观察稳定状态之间的过渡.
主要成果:
- 异质的初始条件转移了关键的营养过渡,并扩大了可能的稳定状态的范围.
- 随机分布的初始生物量导致了具有多个稳定的平衡的空间自我组织的植被模式.
- 渐进的营养水平变化导致状态之间的过渡更顺,与非空间模型中的突然转移不同.
结论:
- 初期条件和空间异质性是决定水生植被群体结构的关键因素.
- 空间显式模型揭示了比非空间模型更复杂的稳定状态范围.
- 观察到的动态类似于像巴塞气球这样的现象,突出了生态系统中出现的特性.
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