菌死体碳占主导地位 全球土壤有机碳储存
Haoran Fu1,2,3,4, Hong Chen5, Zhengbo Ma6
1Ministry of Education Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, China.
Global change biology
|August 9, 2025
概括
微生物死体,而不是植物残留物,是全球土壤有机碳的主要来源. 了解这一点对于在土地利用变化和气候变暖中管理土壤碳储存至关重要.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
背景情况:
- 土壤有机碳 (C) 对土壤健康和气候调节至关重要.
- 植物和微生物死体是土壤C的主要来源,但它们的全球贡献尚未得到充分理解.
研究的目的:
- 量化微生物和植物碳的全球分布和对土壤C存储的贡献.
- 确定影响土壤C池的因素,并为土地管理策略提供信息.
主要方法:
- 全球对2410个微生物死体观测和786个植物残留物 (木质碳 - LPC) 观测的元分析.
- 对不同深度,土地用途和环境条件 (pH,温度) 的土壤C含量进行分析.
主要成果:
- 微生物衍生的C (10.63 ± 0.39 g C kg−1土壤) 在0-100厘米土壤配置中明显超过植物衍生的C (LPC:5.63 ± 0.45 g C kg−1土壤).
- 真菌死体碳 (FNC) 是所有深度土壤C的最大贡献者.
- 发现耕地扩张减少了土壤上层微生物和植物C库存,而较低的土壤pH值和温度与较高的C含量相关,特别是在北美.
结论:
- 微生物死体是全球土壤碳储量的主要驱动因素,超过了植物残留物.
- 土地利用变化,特别是耕地扩张,对土壤产生负面影响.
- 管理策略必须考虑土地利用变化和气温上升,以保护土壤C.
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