在加利福尼亚州北部的混合针叶树林中,规定火灾选择了热性土壤子社区
Monika S Fischer1, Neem J Patel1, Phillip J de Lorimier1
1Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, California, USA.
Environmental microbiology
|August 8, 2023
概括
规定的火灾改变了土壤微生物群落,真菌一般增加,细菌减少. 一些专门的热爱火的微生物显示出非中性组合,表明易燃生态系统中的决定性过程.
科学领域:
- 生态生态学 生态生态学
- 土壤微生物学 土壤微生物学
- 火灾生态学 火灾生态学
背景情况:
- 规定的火灾对于减少野火至关重要,但它对土壤微生物的影响仍未得到充分研究.
- 了解土壤微生物对火灾的反应对于生态系统管理和恢复至关重要.
- 之前的研究更多地关注地面上植被对火灾的反应.
研究的目的:
- 调查规定的火灾对土壤真菌和细菌社区结构的影响.
- 确定控制火灾后土壤微生物群落的组装过程 (中性或决定性).
- 为了识别特定的 pyrophilous 分类物种,积极响应规定的火.
主要方法:
- 在北加利福尼亚混合针叶树林中,在17个月内对四个地块 (两个被烧毁,两个控制) 取样.
- 利用安普利康序列测序来分析真菌和细菌社区的组成.
- 统计分析以识别差异丰富的种类和测试中性社区组合理论.
主要成果:
- 处方火明显改变了真菌和细菌社区结构.
- 大多数差异丰富的真菌种群表现出丰富度增加 (正折叠变化),而细菌种群普遍减少 (负折叠变化).
- 超过90%的种群符合中性组合的预测,但与燃烧相关的种群的一个明显的子群体表现出非中性组合,这表明确定性过程.
结论:
- 规定的火灾作为形成土壤微生物群落的重大干扰.
- 虽然中性过程主导着整体组装,但在特定的燃烧相关微生物群体中,确定性过程是显而易见的.
- 鉴定了15种热性种类,为了解火在微生物社区动态中的作用提供了基础.
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