菌根增强了活性矿物质,但减少了与矿物质相关的碳
Huan Li1,2,3, Guang-Hui Yu1,4, Liping Hao4
1Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA.
Global change biology
|July 25, 2023
概括
灌木菌 (AMF) 和植物根通过增加分解和二氧化碳排放来增强土壤碳循环,同时还通过反应性矿物形成促进碳持久性. 这种相互作用是理解土壤碳动态的关键.
科学领域:
- 土壤科学 土壤科学
- 菌类学 菌类学是指菌类学.
- 生物地质化学生物地质化学
背景情况:
- 土壤有机碳 (C) 是一个关键的全球C池,影响着陆地生产力和气候.
- 树状菌根真菌 (AMF) 与植物形成共生关系,显著影响土壤C动态.
- 在调节土壤C循环方面,AMF根结合和土壤矿物之间的相互作用仍然在很大程度上未被探索.
研究的目的:
- 通过与土壤矿物质的相互作用,研究AMF-根协会如何影响土壤C循环.
- 阐明菌根菌通过哪些机制影响反应性矿物质的形成和土壤C持久性的机制.
主要方法:
- 根的实验操纵和AMF在土壤中的存在.
- 测量土壤溶解有机C,反应性Fe矿物质,垃圾分解和二氧化碳排放.
- 高分辨率纳米级二次离子质谱 (NanoSIMS) 用于可视化真菌-矿物协会.
- 对与反应性矿物形成相关的细菌群体的分析.
主要成果:
- 根和AMF增加了溶解的有机C,反应性Fe矿物质,垃圾分解和CO2排放,但减少了与矿物相关的C.
- 纳米SIMS揭示了真菌和Fe矿物质 (0.5-1.0μm涂层) 之间的直接物理联系.
- 亚米属与反应性Fe矿物质有不同的关系 (例如,Glomus阳性,Paraglomus/Acaulospora阴性).
- 根和AMF,特别是随着垃圾添加,促进了土壤细菌参与反应性矿物质形成.
结论:
- 在土壤C循环中,AMF-根协会起着双重作用:刺激分解,同时通过反应性矿物形成增强C持久性.
- 菌类生物质和Fe矿物质之间的密切物理关联是推动这些效应的关键机制.
- 这些发现为反应性矿物形成提供了新的见解,并为管理土壤C持久性提供了一个框架.
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