The interaction of different components of organic carbon with varying forms of iron and aluminum in soils with andic properties treated with humic acid

Articles in Press

Document Type : Research Paper

Authors

1 Soil Science Department, Faculty of Agriculture, University of Tehran, Karaj, ran

2 Soil Science Departmen, Faculty of Agriculture, University of Tehran, Karaj, Iran

Abstract

Organic-mineral complexes, which are mainly the result of the interaction of organic and mineral soil materials, are one of the most important factors influencing the carbon cycle and soil functions. This study aims to investigate the role of allophanic minerals, and different forms of soil iron and aluminum in stabilizing input organic carbon. Organic carbon components and different forms of iron and aluminum were measured before and after treating the twelve soil samples with andic properties, with humic acid for six months under laboratory conditions. The results showed that the stabilization of organic carbon is mainly controlled by the formation of organic-mineral complexes and allophanes. The formation of surface complexes between bonding agents on the surfaces of mineral and organic materials is one of the most important processes of organic material stabilization in soil. Aluminum and/or iron-humus complexes are another important factor in stabilizing soil organic matter. Stabilization and complex formation with organic materials, allophanes, amorphous iron, and aluminum (Feo, Alo), play the most important role in stabilizing organic materials. Comparison of oxalate extractable silica and iron (Feo, Sio); Pyrophosphate extractable (Alp, Fep), and total iron (Fet) (p<0.05) indicated a significant difference between the treated and control samples. The addition of humic acid, by forming insoluble organic complexes with mineral surfaces on the one hand, and with aluminum and iron released in the soil on the other hand, has caused more stabilization of organic carbon in the soil.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 15 February 2025

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