土壤有机碳原始化由不稳定碳输入水平和长期肥历史共同调节
1State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Key Laboratory of Cultivated Land Quality Monitoring and Evaluation, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences (CAAS), Beijing 100081, China.
The Science of the total environment
|August 10, 2023
概括
不稳定碳输入显著增加土壤有机物分解 (原始效应),特别是在高输入水平. 然而,肥修改通过提高土壤稳定性和营养素的可用性来减少这种影响.
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:
- 无活性碳 (C) 输入和肥料通过原始化效应 (PE) 影响土壤有机物 (SOM) 分解,影响土壤肥力和碳封存.
- 不稳定的C输入水平和长期受精史对PE强度的相互作用仍然不清楚.
- 了解这些相互作用对于管理土壤健康和碳动态至关重要.
研究的目的:
- 为了研究不同可变C输入水平如何与长期受精史相互作用,以控制原始化效应 (PE) 强度.
- 阐明不同受精方案和葡萄糖修改水平下的PE的潜在机制.
- 评估土壤生理化学性质,如聚合和营养物质的可用性,在调解PE中的作用.
主要方法:
- 采集的土壤样本来自一个38年的田间施肥实验,使用五种处理方法 (N,NPK,M1,M2,NPKM2).
- 在土壤中化了三种13C-葡萄糖输入水平:控制 (0%),低 (0.4% SOC) 和高 (2.0% SOC).
- 测量了原料效应,溶解有机碳 (DOC),溶解总 (DTN) 和土壤物理化学特性.
主要成果:
- 随着葡萄糖输入水平的增加,PE显著增加,在所有受精治疗中,在高输入水平时变得强烈积极.
- 增加的PE强度与减少的DTN和增加的DOC:DTN比率相关,这表明从SOM开采.
- 肥料修改处理 (M1,M2,NPKM2) 显示出明显较低的PE,特别是在低葡萄糖输入的情况下,由于增强了SOM稳定性和营养素的可用性.
结论:
- 长期受精史显著改变土壤对不稳定C输入的反应,调节PE强度.
- 肥料的应用可以通过改善土壤C稳定性和营养素的可用性来减轻原始化效应.
- 研究结果强调了综合肥料管理对于优化土壤碳捕集和肥力的重要性.
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