替代植被状态和有限的可逆性:从一个新的放牧实验的见解
Micaela Abrigo1, Gervasio Piñeiro2, Iván Grela3
1Departamento de Sistemas Ambientales, Facultad de Agronomía, Universidad de la República, Uruguay.
The Science of the total environment
|March 5, 2026
概括
由牧场驱动的草原植被状态往往是不可逆转的. 将牧场重新引入隔离区并没有恢复典型的草原结构,这表明可逆性有限和潜在的退化.
科学领域:
- 生态生态学 生态生态学
- 牧场科学 牧场科学
- 植物社区动态 植物社区动态
背景情况:
- 大型草食动物放牧可以在草原中诱导对比的植被状态.
- 牧场诱导的植被变化的可逆性,特别是在重新引入隔离区后,尚不清楚.
研究的目的:
- 为了研究牧场诱导的植被变化的可逆性在里奥德拉普拉塔河的草原.
- 为了比较长期排斥的植被轨迹与在牧场操纵后新建立的植被轨迹.
主要方法:
- 一个为期五年的实地实验操纵了长期隔离区和相邻的牧草草原的放牧.
- 应用了四种治疗方法:长期排斥,持续放牧,排斥然后放牧,放牧然后排斥.
- 在这些治疗过程中,对植被轨迹进行了监测.
主要成果:
- 长期放牧排斥和持续放牧维持了不同的植被状态,支持了替代的稳定状态理论.
- 新的隔离区显示,灌木的侵占速度加快,汇聚到长期未被草地覆盖的地点.
- 放牧的重新引入导致了非线性变化,导致了光的土壤和缺少俯卧草的中间状态,而不是放牧结构的恢复.
结论:
- 草地动态表现出不对称性,生态值和歇斯底里,限制了放牧影响的可逆性.
- 低种子库的丰富性和倒置物种的殖民能力限制了放牧后的恢复.
- 这些发现支持国家和过渡模式,用于管理草原和防止退化.
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