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<p>The conversion of subtropical red soils into farmland involves complex transformations of iron oxides. Investigating iron mineralogy can enhance understanding of magnetic minerals in relation to soil formation on farmland in subtropical regions. In this study, we investigated the properties of iron oxide and its environmental implications in the farmland of Meizhou city, Guangdong province. The results showed that farmland soils had higher magnetism than the red soils developed from the same metamorphic rock. The red soils displayed significantly higher concentrations of goethite and hematite than the farmland soils. The dominant factor influencing the magnetic changes in farmland and red soils was the concentration of fine-grained ferromagnetic minerals. Red soil magnetism is an indicator of soil weathering intensity, whereas farmland soil magnetism is closely related to human cultivation activities. In contrast to the red soils, the farmland soils lacked the pronounced transformation of ferromagnetic minerals into hematite and goethite. A vigorous oxidation process catalyzes the transformation of strong magnetic minerals into significant amounts of hematite and goethite, which promotes the reduced magnetism of red soils. The conversion of red soils into farmland soils initially increased the accumulation of ferromagnetic materials due to cultivation processes. However, long-term cultivation led to the gradual loss of fine-grained ferromagnetic minerals, while goethite and lepidocrocite became the dominant magnetic mineral types.</p>

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Characteristics of the iron mineralogy of farmland and red soils in eastern Guangdong and their pedogenetic implications

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Zixuan Chen,
  • Jinmeng Tang,
  • Xin Liu,
  • Bin Lu,
  • Junhuai Yang,
  • Shuyuan Wang,
  • Dunsheng Xia

摘要

The conversion of subtropical red soils into farmland involves complex transformations of iron oxides. Investigating iron mineralogy can enhance understanding of magnetic minerals in relation to soil formation on farmland in subtropical regions. In this study, we investigated the properties of iron oxide and its environmental implications in the farmland of Meizhou city, Guangdong province. The results showed that farmland soils had higher magnetism than the red soils developed from the same metamorphic rock. The red soils displayed significantly higher concentrations of goethite and hematite than the farmland soils. The dominant factor influencing the magnetic changes in farmland and red soils was the concentration of fine-grained ferromagnetic minerals. Red soil magnetism is an indicator of soil weathering intensity, whereas farmland soil magnetism is closely related to human cultivation activities. In contrast to the red soils, the farmland soils lacked the pronounced transformation of ferromagnetic minerals into hematite and goethite. A vigorous oxidation process catalyzes the transformation of strong magnetic minerals into significant amounts of hematite and goethite, which promotes the reduced magnetism of red soils. The conversion of red soils into farmland soils initially increased the accumulation of ferromagnetic materials due to cultivation processes. However, long-term cultivation led to the gradual loss of fine-grained ferromagnetic minerals, while goethite and lepidocrocite became the dominant magnetic mineral types.