土壤调节剂促进铁结合有机碳的形成及其稳定性
Qi Li1, Linfeng Li1, Huihui Du2
1Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture and Rural Affairs, Guangzhou 510640, China; Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China.
Journal of environmental management
|November 2, 2023
概括
土壤调节剂通过增加与铁结合的有机碳 (Fe-OC) 来促进土壤有机碳 (SOC) 的稳定. 不同的调节剂影响与氧化铁相关的SOC的来源和组成,影响土壤健康.
科学领域:
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
- 环境化学环境化学
背景情况:
- 土壤有机碳 (SOC) 稳定对于土壤健康和缓解气候变化至关重要.
- 氧化铁在结合土壤有机物 (SOM) 中发挥着关键作用,保护其免受降解.
- 不同的土壤调节剂对 SOC 分割的影响,特别是与铁结合的有机碳 (Fe-OC),需要进一步调查.
研究的目的:
- 研究矿物,有机和微生物土壤调节剂如何影响农业土壤中的SOC和氧化铁分离.
- 了解不同调节应用下受氧化铁影响的SOC稳定机制.
- 确定表面吸附和SOM组成变化在Fe-OC积累中的作用.
主要方法:
- 实地实验使用三种不同的土壤调节剂:矿物,有机和微生物.
- 有机碳 (OC) 和铁氧化物分离的分析.
- 核磁共振 (NMR) 光谱法用于评估SOM组成.
- 扫描电子显微镜与能量分散光谱学 (SEM-EDS) 以可视化OC-Fe氧化物协会.
- 基于C同位素和同步子辐射的里埃变换红外光谱 (SR-FTIR) 用于对OC源和结合的详细分析.
主要成果:
- 所有测试的土壤调节剂都显著增加了总SOC和Fe-OC含量.
- 铁-OC与OC总量的比例增加,这表明稳定性得到了增强.
- 低的OC/Fe摩尔比率表明表面吸附是Fe-OC积累的主要机制.
- 调节剂改变了SOM的组成,减少了不稳定的O-基C,增加了稳定的基和芳香C.
- SEM-EDS证实,调理剂促进了OC-Fe氧化物的结合.
- 矿物调节剂倾向于微生物衍生的OC与氧化铁的关联,而有机调节剂倾向于植物衍生的OC.
结论:
- 土壤调节剂通过增加Fe-OC形成有效地提高SOC稳定性.
- 表面吸附和改变的SOM组成是由调节剂驱动的关键机制.
- 不同的调节剂有选择性地影响微生物或植物衍生的OC与氧化铁的结合.
- 结果为农业管理提供了宝贵的见解,以改善土壤碳捕集和土壤健康.
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