有机-有机相互作用主要驱动土壤有机碳积累
Jie Kang1,2, Chenchen Qu1,2, Wenli Chen1
1National Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.
Global change biology
|January 26, 2024
概括
土壤碳储存不仅仅依赖于矿物表面. 新的有机碳 (C) 最好与现有的有机物结合,形成多层C积累. 这种器官-有机相互作用是土壤C封存的关键.
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:
- 传统上,有机矿物相互作用被认为是土壤有机碳 (SOC) 稳定的主要机制.
- 土壤的碳储存能力通常通过矿物属性,特别是表面可用性来评估.
- 矿产空缺在多大程度上完全控制了土壤碳捕获,这一点仍在争论中,这使得SOC动态预测变得复杂.
研究的目的:
- 为了研究有机-有机相互作用在外源碳封存中的作用.
- 为了挑战当前的"碳和"概念,专注于矿产空缺.
- 量化器官和有机相互作用对Mollisols和Ultisols中碳积累的贡献.
主要方法:
- 一个400天的化实验使用13C标记有机材料.
- 在两种对比的土壤中分析碳捕获:Mollisol和Ultisol.
- 研究原生有机物涂层和微生物死体对碳粘附的影响.
主要成果:
- 新加入的碳主要附着在被原生有机物覆盖的矿物表面 ("脏"表面),而不是空缺的矿物场所.
- 有机与有机相互作用导致了多层碳积累,独立于矿物空缺.
- Ultisols显示新碳 (14.2%) 覆盖本地有机物质的覆盖率高于Mollisols (5.8%),从而导致更大的外源C保留.
结论:
- 有机-有机相互作用是土壤碳捕获的关键,以前被忽视的途径.
- 富含多糖的微生物死体主要调解这些相互作用,氧化铁可能增强这个过程.
- 全球和超可以通过有机相互作用每年封存大量的碳,从而部分减轻二氧化碳排放.
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