How long does iron oxide dissolution and transformation require under water-logged conditions? - A perspective from agricultural activity

Mingming Ma, Mei He, Xiuming Liu*, Bolin Che

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    Previous studies have revealed that magnetic enhancement caused by the pedogenic process often occurs in aerobic soils experiencing low to moderate rainfall, while magnetic reduction caused by iron oxide dissolution often occurs in anaerobic soils experiencing high rainfall. To explore the time required for iron oxide dissolution when the soil conditions transform from aerobic to anaerobic, a typical weathering crust profile was selected. The results show the complete process of magnetic enhancement and reduction, and that the former occurred in aerobic soil due to the newborn magnetic minerals during the pedogenic process, while the latter occurred under water-logged conditions caused by rice cultivation with a history of approximately 200 years. Therefore, it can be inferred that the time required for the significant dissolution of iron oxides is probably shorter than 200 years, which is longer than that determined by indoor experiments, but much shorter than the theoretical weathering model.

    Original languageEnglish
    Article number115958
    Pages (from-to)1-8
    Number of pages8
    JournalEarth and Planetary Science Letters
    Volume531
    DOIs
    Publication statusPublished - 1 Feb 2020

    Keywords

    • soil magnetism
    • aerobic-anaerobic conditions
    • magnetic mineral dissolution
    • paddy soil

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