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甘种植减少了木炭C和Al/Fe结合的OC在精选的Ferralsols中

Nontokozo Pertunia Mkhonza¹, Pardon Muchaonyerwa²

¹Soil Science Discipline, School of Agricultural, Earth and Environmental Sciences, University of Kwazulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg, 3201, South Africa. MkhonzaN@ukzn.ac.za.

Environmental monitoring and assessment

|March 31, 2025

概括

甘种植,特别是燃烧,通过减少木炭C和/铁-有机物 (Al/Fe-OM) 复合物,减少土壤有机碳 (OC). 这些复合物是稳定土壤碳的关键.

科学领域:

土壤科学土壤科学
农业科学农业科学
环境科学环境科学

背景情况:

铁盐的特点是具有反复的木炭碳 (C) 和/铁-有机物 (Al/Fe-OM) 复合体,这些复合体有助于土壤有机碳 (OC).
与自然生态系统相比,长期种植甘并进行收获前燃烧可能会对这些碳池产生不同的影响.

研究的目的:

调查甘种植与树林对土壤OC的影响,特别是Ferralsols中的木炭C和Al/Fe-OM复合物.
在不同的土地用途和土壤深度下,量化这些碳分数对OC总量的贡献.

主要方法:

从甘和瓦特尔森林中采集了土壤样本,深度为100厘米.
分析包括总碳,木炭碳和/铁结合有机碳 (Al/Fe-OC).
数据使用双向差异分析进行统计分析.

主要成果:

在这两个研究地点,与树林相比,甘种植显著减少了木炭C和Al/Fe结合的OC.
与Al/Fe结合的OC占总OC的很大一部分 (48.7-72.2%在甘土壤中, 44.4-45.6%在森林土壤中).
木炭C随着土壤深度的下降,特别是在甘下,而Al/Fe结合的OC则随着两种土地用途的深度的下降而下降.

结论:

与Al/Fe结合的OC是稳定这些Ferralsols中的土壤有机碳的主要机制.
长期种植甘,特别是燃烧,通过减少木炭C和Al/Fe结合的OC减少土壤有机碳储量.
了解这些影响对于热带和亚热带农业系统的可持续土地管理至关重要.

关键词:

酸性土壤是一种酸性土壤.碳稳定碳稳定碳稳定有机矿物复合物有机矿物复合物土壤碳封存土壤碳封存

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