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在河口湿地恢复为大米田后,与铁结合的有机碳下降

Xuyang Liu¹, Weiqi Wang², Elise Pendall³

¹Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350117, China; Institute of Geography, Fujian Normal University, Fuzhou 350117, China; Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW 2751, Australia.

The Science of the total environment

|November 5, 2024

概括

田的湿地回收改变了土壤的铁和微生物群落,影响了结合铁的有机碳 (Fe-OC) 和土壤有机碳 (SOC) 的稳定. 减少铁的细菌在这种脱过程中发挥着关键作用.

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:

结合铁的有机碳 (Fe-OC) 对土壤有机碳 (SOC) 的长期维持至关重要.
了解控制Fe-OC动态的机制,尤其是在应对土地利用变化的情况下,至关重要.
河口湿地容易受到回收利用,这影响了它们的碳储存能力.

研究的目的:

为了研究铁 (Fe),碳 (C) 和降解铁的细菌 (FeRB) 在回收的田与自然湿地之间的合.
阐明FeRB在Fe-OC动态和湿地回收后SOC稳定中的作用.
评估土地利用变化对土壤氧化还原过程和铁物种化的影响.

主要方法:

恢复的田和自然的地之间的土壤特性和微生物群落的比较.
分析各种铁分数 (FeII),FeIII,HCl-Fe_t,Fe_d,Fe_o,Fe_p) 和它们与Fe-OC和SOC的关系.
非度量多维缩放 (NMDS) 来评估FeRB社区的可变性.
结构方程建模 (SEM) 来确定FeRB和铁物种化对碳池的影响.

主要成果:

湿地复苏显著改变了土壤的氧化还原过程,降低了Fe (II),Fe (III),并增加了复杂铁 (Fe_p).
根据土壤类型,FeRB社区的差异很大,Fe-OC度较低,可能与菌和Anaeromyxobacter等细菌的Fe减少有关.
在回收后,Fe-OC和SOC含量都下降了,但Fe-OC对总SOC的相对贡献增加了.

结论:

降低铁的细菌调解铁结合的有机碳的脱,影响恢复的河口湿地的土壤有机碳整体稳定.
转换为大米种植后的铁物种化和微生物活动的变化是改变碳动态的关键驱动因素.
这些发现强调了河口湿地碳循环对土地利用变化的敏感性和微生物铁循环的关键作用.

关键词:

碳稳定碳稳定溶解的有机碳溶解的有机碳减少Fe的细菌可以减少Fe的含量.土壤有机物质土壤有机物质.土壤氧化还原作用

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