土壤与铁结合的有机碳的动力学在亚热带常青宽叶森林中下降
Jia-Qi Sun1, Fu-Zhong Wu2, Yao-Yi Zhang1
1Key Laboratory for Humid Subtropical Eco-geographical Processes of Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou 350117, China.
Ying yong sheng tai xue bao = The journal of applied ecology
|November 6, 2025
概括
森林砍伐通过改变氧化铁水平,显著增加了土壤铁结合有机碳 (Fe-OC). 这一过程增强了森林土壤中的碳稳定性和保留.
科学领域:
- 土壤科学 土壤科学
- 森林生态 森林生态
- 生物地质化学生物地质化学
背景情况:
- 森林降落通过调节水流和引入有机物质影响土壤特性.
- 土壤与铁结合的有机碳 (Fe-OC) 在碳封存中起着至关重要的作用.
- 了解落对Fe-OC的影响对于森林碳循环研究至关重要.
研究的目的:
- 为了研究森林通过降落对氧化铁形式和Fe-OC含量的影响,在一个亚热带常青宽叶森林.
- 在透落条件下量化土壤氧化铁 (Fed,Fep,Feo) 和Fe-OC的变化.
- 评估落对土壤有机碳的稳定性和保留的影响.
主要方法:
- 在现场进行实地控制实验,比较通过降雨与树冠间隙降雨.
- 在土壤层 (0-20厘米,20-40厘米) 中分析自由 (Fed),复合 (Fep) 和无形 (Feo) 氧化铁含量.
- 测量土壤的Fe-OC含量,其对总有机碳的贡献比率,以及碳与铁的摩尔比率.
主要成果:
- 通过降落显著增加了自由氧化铁 (Fed) 3.6% (主要在地表) 和复合氧化铁 (Fep) 6.3% (在表面和深层土壤).
- 无形铁氧化物 (FeO) 含量没有受到透的影响.
- 土壤的Fe-OC含量增加了24.9%,其贡献比率增加了19.7%,碳与铁的摩尔比率增加了19.7%,土壤层间的影响一致,但时间差异不同.
结论:
- 穿透降落增强了Fed和Fep的积累,加强了土壤Fe-OC的稳定性和保留.
- 树冠拦截和通过落引入树冠衍生的有机物质有助于增加Fe-OC.
- 这些发现凸显了落在森林生态系统中调节土壤碳动态中的重要作用.
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