土壤C矿化和C-Fe合:芬顿反应和香果园中草覆盖下的微生物活动之间的权衡

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Updated: May 22, 2025

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Lingbo Dong¹, Weifang Hu², Qi Li²

¹State Key Laboratory of Soil and Water Conservation and Desertification Control, College of Soil and Water Conservation Science and Engineering (Institute of Soil and Water Conservation) Northwest A&F University, Yangling, 712100, Shaanxi, China; Institute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resources, Yangling, 712100, Shaanxi, China.

Journal of environmental management

|May 20, 2025

概括

草影响土壤碳循环,因为它改变了与铁相关的碳和活性氧物种. 在三年内,它减少了土壤的活性氧物种,但增加了碳矿化,特别是在第一年之后.

科学领域:

农业科学农业科学
土壤科学土壤科学
环境科学环境科学

背景情况:

草影响土壤碳 (C) 循环,通过添加有机物质和结构修改.
土壤铁 (Fe) 相关碳 (Fe-OC) 和活性氧物种 (ROS) 是这一过程的关键组成部分.
在草覆盖下的香果园中Fe-OC和ROS的具体动态尚不清楚.

研究的目的:

为了调查草覆盖对土壤Fe-OC,ROS和C矿化在香果园中的三年影响.
为了阐明驱动土壤条件下这些土壤参数变化的机制.
了解芬顿反应,微生物活动和土壤物理化学性质之间的相互作用.

主要方法:

在香果园中进行了三年的实地研究.
应用草布作为实验性治疗.
对土壤Fe-OC,ROS (超氧化基O2和基OH),溶解有机碳 (DOC),土壤pH和C矿化率的监测.

主要成果:

由于芬顿反应减弱和土壤pH值增加,Fe-OC含量在第一年显著下降,但在随后的几年里稳定了下来.
土壤ROS水平 (O₂^·-和OH) 在三年内显著降低,与土壤pH值增加和芬顿反应减弱有关.
土壤C矿化在第二年和第三年显著增加,这是由于微生物活动和C来源的增强,尽管ROS减少了.

结论:

草覆盖显著改变了香园中的土壤Fe-OC,ROS和C矿化动态.
覆盖的持续时间会影响观察到的效果,在第一年之后,C矿化发生了显著的转变.
芬顿反应和微生物活动之间的平衡,由土壤物理化学性质调节,决定了草对土壤C循环的整体影响.

关键词:

与Fe相关的碳芬顿反应是芬顿反应的一个反应.有反应性氧物种的反应性氧物种.土壤有机碳土壤有机碳

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