Abstract
The stability of some highly weathered soils of the tropics is controlled by their organo-mineral substances. Highly weathered soils from 10 different locations were sampled from their A and B horizons to determine their aggregate stability. The objective of the study was to determine the aggregate stability of the soils and their relationships with geochemical constituents. The major geochemical elements of the soils are quartz and kaolinite, SiO2, Al2O3 and Fe2O3, while the dithionite extractable Fe and Al was greater than their corresponding oxalate and pyrophosphate forms. The mean-weight diameter from dried aggregates (MWDd) and their corresponding wet mean-weight diameter (MWDw) were related significantly (r = 0.64*). The dithionite extracted Al and Fe or the crystalline forms of these elements were outstanding in the stability of the aggregates. However, this did not diminish the influence of SOC reduced to third order level in the stability of the soils. The influence of SOC in these soils, however, indirectly manifested on the role of Fep and Alp in the aggregation of these soils. The crystalline Fe and Al sesquioxides were very prominent in the aggregation and stability of these soils.
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Acknowledgements
The contribution of Alexander von Humboldt-Foundation, Bonn, Germany (AvH) through ‘Resumption Fellowship’ and ‘The Equipment Donation Programme’ is acknowledged. This manuscript was written when one of the authors (CAI) was at the Abdus Salam International Centre for Theoretical Physics (ICTP) within the framework of Regular Associateship Programme.
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IGWE, C.A., ZAREI, M. & STAHR, K. Stability of aggregates of some weathered soils in south-eastern Nigeria in relation to their geochemical properties. J Earth Syst Sci 122, 1283–1294 (2013). https://doi.org/10.1007/s12040-013-0335-6
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DOI: https://doi.org/10.1007/s12040-013-0335-6