由作物残留物引起的Fe-DOC复合对米土壤中酸盐减少的影响
Jun Xing1, Qiwu Wang1, Luyu Yang1
1Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.
The Science of the total environment
|April 19, 2024
概括
将中国牛奶 (CMV) 草等作物残留物添加到米土壤中,可以显著提高酸盐的减少,降低N2O排放. 这是由于铁有机物复合的增加和有益的微生物变化,改善土壤健康.
科学领域:
- 土壤科学 土壤科学
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
背景情况:
- 溶解有机物 (DOM) 与铁 (Fe) 的复合会影响土壤中的电子转移.
- 这种复杂化对酸盐减少和米土壤中N2O产生的影响,特别是对作物残留的回报,尚不清楚.
研究的目的:
- 为了研究中国牛奶 (CMV) 草在被洪水淹没的田土壤中对酸盐减少和N2O生产率的回归的影响.
- 阐明驱动这些过程的机制,包括Fe-DOM复杂化和微生物社区转移.
主要方法:
- 在洪水条件下用或不用CMV草化米土28天.
- 量化酸盐减少率,N2O排放,溶解有机碳 (DOC) 和Fe (II) 含量.
- 对微生物群落结构和脱基因 (napA,narG) 丰富性的分析.
主要成果:
- 酸盐减少率增加了1.99倍与CMV草回报.
- 与对照组相比,在CMV和大米草的土壤中,N2O的生产率显著下降.
- 增加作物残留物增加了DOC和Fe (II) 含量,促进了Fe (II) -DOC复合.
- 观察到增加了减少铁的丰富,电活性和脱的细菌.
- 脱基因napA和narG的表达显著增加.
结论:
- 由作物残留物回归增强的Fe-DOM复合,在加速土中的酸盐减少方面发挥着至关重要的作用.
- 微生物群落转向减少铁的和脱的属,有助于酸盐的转化.
- 涉及Fe (II) 的非生物反应是最终将化物减少为气的关键,这对N2O减轻有影响.
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