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The spatial distribution of potassium status and clay mineralogy in relation to different land-use types in a calcareous Mediterranean environment

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Abstract

In order to investigate changes caused in clay mineralogy and potassium (K) status by different land-use types, 42 soils samples (0–30 cm) were monitored and analyzed. Soil samples belonging to Reference Soil Groups of Cambisols and Vertisols were collected from three neighboring land uses involving cropland (under long-term continuous cultivation), grassland, and forestland. The soils reflected an alkaline and calcareous aspect as were characterized by high pH (mean of 7.1 to 7.5) and calcium carbonate equivalent (mean of 35 to 97 g kg−1) in the three land-use types. X-ray diffraction patterns of the clay fraction showed that the soils were mainly composed of illite, smectite, chlorite, and kaolinite. Chlorite and kaolinite remained unweathered irrespective of land use and soil types, soil processes, and physicochemical attributes assessed. Some changes in the XRD diffractograms of illite and smectite (the intensity or the position of peaks) were observed in the cultivated soils compared to those of the adjoining grassland that may explain the dynamics of the K trapped in illite interlayer sites. Potassium issues reflected a heterogeneous response to changes in land-use types. In light of this, a pronounced variation in soluble K (4–22 mg kg−1), exchangeable K (140–558 mg kg−1), and non-exchangeable K (135–742 mg kg−1) appeared among the land-use types for both Cambisols and Vertisols, corresponding to variability in clay content, nature and type of clay mineral (mainly illite and smectite), cation exchange capacity (CEC), and soil organic carbon (SOC). In general, the largest amounts of soluble K and exchangeable K were recorded in the forestland, whereas the highest contents of non-exchangeable K were found in the grassland for both Cambisols and Vertisols. Exchangeable K, available K, CEC, and clay contents in the soils with higher smectite values (25–50 %) were significantly different (P ≤ 0.05) compared to those of the lower smectite values (10–25 %). This suggests that smectite is a major source for surface sorption of K in the studied soils.

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Acknowledgment

The authors gratefully acknowledge Urmia University and the Iran National Science Foundation for the financial support of this research project.

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Authors and Affiliations

  1. Soil Science Department, Urmia University, P.O. Box 165, Urmia, 57134, I.R., Iran

    S. Rezapour & A. Samadi

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  1. S. Rezapour
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  2. A. Samadi
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Correspondence to S. Rezapour.

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Rezapour, S., Samadi, A. The spatial distribution of potassium status and clay mineralogy in relation to different land-use types in a calcareous Mediterranean environment. Arab J Geosci 7, 1037–1047 (2014). https://doi.org/10.1007/s12517-012-0746-8

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  • DOI: https://doi.org/10.1007/s12517-012-0746-8

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