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Addition of Clayey Soil to Sandy Soil Increases Sorption of Water-Extractable Organic C But Also Its Release

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Abstract

Water-extractable organic C (WEOC) plays an important role in organic C loss and retention, but little is known about the effect of clayey soil addition to sandy soil on short-term sorption and release of WEOC with regard to clay soil rate and properties. Wheat straw-derived WEOC was added at 0, 403, 759, 1379, 2505 and 4831 mg kg−1 to sandy soil alone or amended with two clayey soils: vertisol (high cation exchange capacity (CEC)) and solonetz (low CEC) at 10, 20 or 40% (w/w). After over-night shaking, the supernatant was decanted to determine sorption. Then, water was added followed by over-night shaking for determining desorption. In sand alone, net sorption (sorption with WEOC added—no WEOC added) was low and little affected by WEOC addition rate. With vertisol, net sorption increased with WEOC addition rate and was three- to tenfold higher than with sand alone and higher than with solonetz. With both clayey soils, net sorption differed among clay rates only at ≤ 1379 mg kg−1 where it was about 30% higher with 40% vertisol and sixfold higher with 40% solonetz, compared to 10% clay soil. Net desorption differed little between sand alone and with solonetz, but it was up to twofold greater than with vertisol. Addition of clayey soils to a sandy soil increased short-term sorption of WEOC which was influenced by clay CEC and addition rate. However, the release of previously bound WEOC indicates that WEOC may be bound to clays only temporarily.

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Acknowledgements

The authors thank the Australian Government for the Endeavour Postdoctoral Fellowship award (2226_2011) to Muhammad Riaz.

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Correspondence to Muhammad Riaz.

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Riaz, M., Marschner, P. Addition of Clayey Soil to Sandy Soil Increases Sorption of Water-Extractable Organic C But Also Its Release. J Soil Sci Plant Nutr 22, 597–606 (2022). https://doi.org/10.1007/s42729-021-00672-0

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  • DOI: https://doi.org/10.1007/s42729-021-00672-0

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