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土壤的氧化还原状态和溶解的有机物质控制了在米土壤中的生物地球化学转化

Chuan Chen¹, Wanying Qu¹, Zi-Yu Gao²

¹Jiangsu Key Laboratory for Organic Solid Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, College of Resources and Environmental Sciences, Nanjing Agricultural University, No. 1 Weigang, Xuanwu district, Nanjing 210095, China.

Journal of hazardous materials

|December 11, 2025

概括

溶解的有机物和土壤的氧化还原潜力极大地控制了在土中的铁和循环. 这些因素影响微生物基因,影响甲基化和动员.

科学领域:

环境微生物学环境微生物学
生物地质化学生物地质化学
土壤科学土壤科学

背景情况:

麦田土壤的生物地质化学过程对氧化还原振荡很敏感.
土壤氧化还原状态,微生物功能基因和 (As) 转换之间的相互作用仍然不清楚.

研究的目的:

研究如何氧化还原潜力 (Eh) 和溶解有机物 (DOM) 影响微生物功能基因和在米土壤中的生物地球化学转化.
为了确定参与循环的响应性微生物宿主.

主要方法:

使用有控制的氧化还原潜力 (Eh) 梯度的构造土壤斜坡进行化实验.
微生物功能基因 (Geo,dsr,arrA,arsC,arsM) 和物种的量化.
溶解有机碳 (DOC) 的分析和米草提取物和活性炭 (AC) 的应用.
结构方程建模以确定DOM,Eh,功能基因和生物地球化学过程之间的关系.

主要成果:

降低EH与参与铁减少,硫酸盐减少和甲基化相关的基因丰度增加有关.
洪水显著上调了酸还原酶 (arrA) 和甲基转移酶 (arsM) 基因的转录.
排水和再排水周期抑制了微生物活动和甲基化,而DOM添加 (米提取物) 部分恢复了这些过程.
DOM被确定为Eh的直接驱动因素,随后影响了功能基因丰度和生物化学.

结论:

孔水DOM和土壤Eh是大米土壤中铁和生物地球化学转变的关键调节者.
这些因素通过影响涉及循环的关键功能基因的丰度,转录和微生物宿主来发挥控制作用.

关键词:

甲基化的甲基化.溶解有机物质可以溶解有机物质这里是大米土壤.氧化还原过程是指氧化还原过程.土壤的氧化还原潜力

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