牧场对干旱地区植被模式的差异影响:一项比较研究
Kalyanashis Sahoo1, Jayita Koley1, Santu Ghorai2
1Department of Applied Mathematics, University of Calcutta, 92 APC Road, Kolkata 700009, India.
Chaos (Woodbury, N.Y.)
|November 19, 2025
概括
干旱地区的生态系统面临着气候变化和过度放牧造成的崩. 数学模型显示,自然牧场比线性牧场更好地支持干旱下的植被生存.
科学领域:
- 生态生态学 生态生态学
- 数学生物学 数学生物学
- 环境科学 环境科学
背景情况:
- 旱地生态系统受到土地退化和生物生产率下降的威胁.
- 植被模式的形成 (差距,斑点,条纹) 受降水,蒸发和草食动物放牧的影响.
- 这些模式对于生态系统适应气候变化,包括干旱和气温上升至关重要.
研究的目的:
- 调查不同类型的草食牧场 (线性或自然/半角形) 对干旱地区植被模式的形成和维持的影响.
- 分析气候因素和牧场如何相互作用以影响生态系统稳定.
- 了解干旱地生态系统中牧场诱导的制度转变背后的机制.
主要方法:
- 制定一个数学模型,用于干旱地区生态系统的植被动态与无地的沙土.
- 将线性和自然 (半角形) 牧场纳入植被模型.
- 对图灵和霍夫-图灵分叉的分析,以确定在不同牧场压力下形成的植被模式.
主要成果:
- 增加土壤蒸发,降水减少和过度放牧可以通过气候诱导的歇斯底里引起生态系统制度转变,导致植被崩.
- 在降水量较低的环境中,自然 (sigmoidal) 牧场对于长期的植被生存比线性牧场更有效.
- 基于放牧压力,各种植被模式出现,与观察到的现实世界模式一致.
结论:
- 草食动物放牧显著影响干地生态系统的结构和稳定性.
- 政权转变和潜在的生态系统崩是由气候变化和放牧强度的相互作用驱动的.
- 自然放牧策略对于在不断变化的气候条件下保持干旱地植被的弹性至关重要.
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