在自然和实验性土壤肥沃度梯度中控制微生物碳储存的社区组成和生理可塑性
Orpheus M Butler1, Stefano Manzoni2, Charles R Warren3
1School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, Australia. orpheus.butler@sydney.edu.au.
The ISME journal
|October 18, 2023
概括
微生物将碳 (C) 储存在中性脂质脂肪酸 (NLFA) 和聚基酸 (PHB) 等化合物中,以在资源稀缺的情况下生存. 储存策略因土壤肥力而异,真菌偏好NLFA,细菌偏好PHB.
科学领域:
- 微生物生态学 微生物生态学
- 生物地质化学生物地质化学
- 土壤科学 土壤科学
背景情况:
- 在营养受限的情况下,微生物合成富含碳 (C) 的化合物.
- 这些细胞内C储存池对于微生物生存和生态系统功能至关重要,特别是在不育土壤中.
- 了解这些化合物的动态对于土壤健康和营养循环至关重要.
研究的目的:
- 研究三个关键的C储存化合物的动力学和驱动因素:中性脂质脂肪酸 (NLFA),多基酸 (PHB) 和三糖.
- 为了检查这些储存化合物在土壤肥沃性的自然梯度中如何变化.
- 阐明不同微生物种群和营养限制在C储存策略中的作用.
主要方法:
- 在澳大利亚东部肥沃度梯度的土壤中分析NLFA,PHB和三糖度.
- 使用极性脂类脂肪酸 (PLFA) 来对微生物生物质量进行量化,以对结构性微生物生物质量进行索引.
- 补充实验室化实验以评估微生物对葡萄糖和酸盐修正案的反应.
主要成果:
- 在微生物和土壤有机碳中,NLFA,PHB和三糖占很大一部分 (分别为8.540%和0.060.6%).
- 与肥沃土壤相比,对NLFA和PHB的分配在不育土壤中是微生物生物质的2-3倍.
- PHB分配与需求正相关,而NLFA分配与较高的真菌:细菌比率相关;潜伏期对葡萄糖和酸盐的反应不同.
结论:
- NLFA很可能作为C限制性真菌的"储备"C储存,而PHB则作为P限制性细菌的"多余"C储存.
- 微生物C储存动态是由社区层面的转变和细胞内生理可塑性的组合驱动的.
- 这些发现揭示了可预测的微生物C储存模式,跨越土壤肥力和基质石化梯度.
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