在温带农业土壤中增加垃圾来源有机碳的保留,增加温带农业土壤的初始碳含量
Neha Begill1, Steffen A Schweizer2, Axel Don1
1Thünen Institute of Climate-Smart Agriculture, Braunschweig, Germany.
Global change biology
|December 8, 2025
概括
土壤有机碳 (SOC) 稳定是碳封存的关键. 我们的研究表明,虽然精细土壤碳的储存有限,但初始土壤碳含量对垃圾保留有积极的影响,而不是精细碳的形成.
科学领域:
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 稳定土壤有机碳 (SOC) 对大气二氧化碳捕获至关重要.
- 土壤有机碳和概念假设有限的储存能力为精细土壤有机碳 (OCfine),这是矿物相关和稳定的.
- 低有机物质 (OM) 和细纹土壤被认为具有更高的额外碳 (C) 存储潜力.
研究的目的:
- 评估温带农业土壤稳定额外有机碳 (OC) 的潜力.
- 调查土壤初始有机碳 (SOC) 含量,土壤质地和微细分数中的OC负载对新添加的垃圾衍生碳稳定性的影响.
- 确定控制OCfine和粗土有机碳 (OCcoarse) 的形成和保留的因素.
主要方法:
- 对21个温带农业土壤进行分析,其SOC (0.7%-10.2%),泥含量 (32%-92%) 和OCfine负荷 (17-135 g C kg-1) 不同.
- 2年内化13C标记的,以追踪OCcoarse (>20微米) 和OCfine (<20微米) 分数中的分解和恢复.
- 使用NanoSIMS (纳米模拟二次离子质谱) 进行微观分析垃圾衍生的OC定位.
主要成果:
- 随着最初的SOC含量和OCfine负载,垃圾衍生的OC保留显著增加,主要是由于OC粗保留的增强.
- 垃圾衍生的OCfine的形成与初始SOC和OCfine负载有负相关性.
- 当对分解的垃圾进行正常化时,最初的SOC和土壤质地不会显著影响OCfine形成效率.
- 纳米SIMS揭示了由垃圾衍生的OC形成微观尺度的斑块,部分与现有的OM和矿物网站重叠.
结论:
- 最初的SOC含量,OCfine负载和土壤质地可能不是研究范围内的新OCfine形成的主要限制.
- 增加的初始SOC含量通过减少其矿化而对垃圾衍生的OC保留产生积极影响.
- 这些发现表明,土壤特性以外的其他因素可能会限制新的OCfine形成,现有的SOC增强了添加碳的稳定性.
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