微生物效率驱动在有机化肥下依赖于深度的土壤碳储存
Wentao Zhang1, Yingxin Lu1, Leanne Peixoto2
1College of Agriculture, Nanjing Agricultural University, Nanjing, Jiangsu, China.
Journal of environmental management
|February 20, 2026
概括
有机肥料通过提高微生物碳利用效率 (CUE) 和死体形成来提高土壤有机碳 (SOC) 储存. 这种效应在较深的土壤层中更为明显,使它们成为重要的SOC沉池.
科学领域:
- 土壤科学 土壤科学
- 微生物学 微生物学
- 生物地质化学生物地质化学
背景情况:
- 微生物活动和周转是土壤有机碳 (SOC) 积累的关键驱动因素.
- 施肥对土壤深度SOC储存的影响,由微生物生命死亡周期介导,缺乏机械理解.
研究的目的:
- 研究长期施肥,特别是有机肥如何影响微生物碳利用效率 (CUE) 和土壤有机碳 (SOC) 在不同土壤深度积累.
- 阐明微生物死体在各种受精模式下为SOC储存做出贡献的机制.
主要方法:
- 来自45年长期施肥实验 (控制,NPK,肥料,NPK+肥料) 的土壤样本分析.
- 使用H218O标签测量微生物碳利用效率 (CUE).
- 使用氨基糖分析量化微生物死体.
- 评估土壤特性,包括氧化铁和Ca2+含量.
主要成果:
- 有机肥料 (M和NPKM) 通过改善营养平衡和土壤结构,显著增加了表面土壤中的微生物生长和CUE.
- 与矿物化化肥 (NPK) 相比,肥料的应用导致了表面土壤中较高的微生物死体产量.
- 微生物生物质,死体质和CUE随着土壤深度的下降而减少,但肥丰富的元素稳定了死体质,增加了其在深层土壤 (74-76%) 和表面土壤 (34-43%) 中对SOC的贡献.
结论:
- 改善微生物CUE,特别是有机便,通过促进持久的微生物衍生的有机物质的形成来增强SOC封存.
- 有机肥料的应用通过稳定微生物死体质量,将地下土壤转化为主要的SOC沉.
- 施肥策略应考虑微生物过程和土壤深度,以有效管理SOC.
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