火灾频率的变化对旧生长草原的地下植物部件产生影响,对它们的弹性构成风险
Aline Bertolosi Bombo1, Alessandra Fidelis1, Soizig Le Stradic2
1Lab of Vegetation Ecology, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Avenida 24-A, 1515, Rio Claro, 13506-900, Brazil.
American journal of botany
|October 11, 2025
概括
草原频繁发生的火灾减少了地下芽树的数量,增加了木质根茎. 这可能会不可逆转地改变植物群落,威胁火灾环境中的生物多样性和生态系统服务.
科学领域:
- 生态生态学 生态生态学
- 植物生物学 植物生物学
- 保护科学 保护科学
背景情况:
- 像Campos Rupestres这样的老生长草原是缺乏营养的,限制了植物的建立.
- 火是影响这些生态系统中植被结构和地下生物质的关键因素.
- 火灾频率对火灾易发草原地下部件的影响尚不清楚.
研究的目的:
- 为了研究火灾频率的变化如何影响地下工厂组件 in campos rupestres.
- 评估重复的火灾如何塑造与植物持久性和再生有关的地下特征.
- 了解火灾易发生态系统中的植物弹性和再生策略.
主要方法:
- 对比了三个Campos rupestres的地下设施组件,它们的火灾频率不同 (在34年内发生了1,6和10起火灾).
- 量化精细根生物量,地下专门的器官生物量,芽生长银行大小,芽生长器官密度和器官组成.
主要成果:
- 高火频率降低了芽的大小和地下器官密度.
- 器官的组成发生了变化,草和草根较少,但树根较多.
- 总体而言,地下器官生物量随着火灾频率的增加而增加,而细根生物量则减少.
结论:
- 由于火灾频率的地下部件的变化,可能会导致社区结构的不可逆转转移.
- 非常频繁的火灾威胁着岩石田的弹性,可能危及生物多样性和生态系统服务.
- 新的消防制度可能对保护状况和生态系统功能产生毁灭性的影响.
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