在溶解的有机物中积累的反性成分降低了长期肥下红色土壤的微生物代谢系数
Xiao Yang1, Shuai Zhang2, Dong Wu2
1State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China/Key Laboratory of Arable 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; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China.
The Science of the total environment
|May 22, 2024
概括
长期的肥料修改通过改变溶解有机物 (DOM) 化学多样性来减少土壤二氧化碳排放. 这种转变增加了微生物碳使用效率,减轻了全球变暖的影响.
科学领域:
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
- 微生物生态学 微生物生态学
背景情况:
- 微生物代谢显著影响土壤二氧化碳排放和全球变暖.
- 溶解有机物 (DOM) 的化学多样性影响微生物代谢和土壤碳循环,但其与生物利用性的联系尚不清楚.
研究的目的:
- 研究DOM化学多样性和生物可用性之间的关系.
- 评估长期受精对DOM化学多样性和微生物代谢的影响.
主要方法:
- 分析了来自亚热带农业生态地区的土壤样本,这些土壤具有多种长期受精.
- 使用多光谱技术 (UV-Vis,FTIR,EEMs) 来量化DOM的化学多样性.
- 测量了微生物代谢系数 (qCO2) 和DOM组成.
主要成果:
- 长期的肥料修改减少了高达57%的qCO2.
- 肥料应用增加了反抗性的DOM成分 (芳香度,化) 并降低了不稳定的成分.
- 土壤pH值是影响DOM化学多样性的关键因素,解释了56.7%的变化.
结论:
- 通过改变DOM化学多样性来提高微生物碳利用效率,长期的肥料修订调节了土壤的二氧化碳排放.
- 由肥料驱动的土壤pH值增加,促进了反抗性的DOM积累,可能是通过有利于微生物消耗或减少可变分量的溶解性.
- 了解DOM化学多样性对于管理土壤碳循环和缓解气候变化至关重要.
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