营养素的可用性和酸性侵蚀决定了石灰岩早期由石化生物微生物的殖民
Jin Chen1, Qing Zhao2, Fangbing Li1
1Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences and Institute of Agro-Bioengineering, Guizhou University, Guiyang, Guizhou, China.
Frontiers in microbiology
|June 26, 2023
概括
微生物迅速殖民石灰岩,起初真菌主导细菌. 酸性侵蚀和营养物质的可用性显著影响微生物群落结构,影响岩石生物降解和生态系统恢复.
科学领域:
- 微生物学 微生物学
- 地质科学 地质科学
- 生态生态学 生态生态学
背景情况:
- 微生物,特别是先驱物种,是岩石退化和土壤形成的关键驱动因素.
- 了解早期微生物对石灰岩等无菌基质的殖民是生态系统恢复和预测生物退化至关重要的.
- 诸如酸性侵蚀和营养物质的可用性等因素被假定会影响石化生物微生物的殖民.
研究的目的:
- 在各种环境条件下,研究在消毒石灰岩上早期微生物殖民过程.
- 为了确定影响微生物社区结构的关键因素,在最初的60天的殖民.
- 区分细菌和真菌群落对酸性压力和营养物质可用性的反应.
主要方法:
- 消毒的石灰石样本接受了五种处理:有机酸 (Oa),无机酸 (Ia),Ia + 营养溶液 (Ia+Nut),营养溶液 (Nut) 和雨 (RS).
- 样品被放置在自然环境中60天.
- 使用高通量测序来分析殖民石灰岩表面的微生物群落.
主要成果:
- 在早期的石灰岩殖民时期,真菌的丰富性超过了细菌的丰富性;占主导地位的类包括Proteobacteria, Bacteroidota, Actinobacteriota (细菌) 和Ascomycota, Basidiomycota, Chytridiomycota (真菌).
- 酸性侵蚀和营养物质的可用性明显塑造了微生物群落,细菌对环境压力的敏感性比真菌更高.
- 增加的酸度和营养度导致微生物群体与对照群体的分歧更大,这表明环境影响很大.
结论:
- 石灰岩具有很高的生物感应性,在自然环境中支持在60天内快速的微生物殖民.
- 营养物质的可用性和酸性侵蚀都是早期微生物群落殖民石灰岩的关键决定因素.
- 真菌群体表现出高度的耐药性和竞争力,而细菌群体在环境压力下表现出高度的弹性和稳定性.
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