Research Article
Physicochemical Properties and Surface Charge Characteristics of Arid Soils in Southeastern Iran
Table 3
Chemical properties of the representative profiles.
| | Soil number | Depth (cm) | | | pHKCl | pH () | OC% | SAR | CCE% |
EC
dSm−1 | CEC | K+ | Na+ | Mg2+ | Ca2+ |
Fed (%) | | | (1 : 2.5) | | cmolckg−1 |
| | 1 | 0–25 | 7.65 | 7.79 | 7.60 | −0.19 | 0.34 | 7.4 | 21.37 | 29.85 | 41.4 | 0.67 | 20 | 8.5 | 6.5 | 0.16 | | 25–78 | 7.60 | 7.76 | 7.55 | −0.21 | 0.20 | 7.0 | 24.98 | 27.5 | 26.3 | 0.22 | 14 | 4.5 | 3.5 | 0.15 | | 78–110 | 7.55 | 7.68 | 7.50 | −0.18 | 0.23 | 6.6 | 19.83 | 32.5 | 33.4 | 0.36 | 16 | 7.2 | 4.3 | 0.14 | | 100–150 | 7.70 | 7.87 | 7.62 | −0.25 | 0.12 | 7.7 | 23.70 | 18.11 | 31.3 | 0.17 | 15.4 | 5.2 | 3.3 | 0.15 |
| | 2 | 0–20 | 7.85 | 7.97 | 7.80 | −0.17 | 0.18 | 3.6 | 27.04 | 0.96 | 21.5 | 0.23 | 6.8 | 4.8 | 2.5 | 0.09 | | 20–50 | 7.90 | 8.03 | 7.86 | −0.17 | 0.14 | 3.7 | 27.55 | 0.40 | 18.2 | 0.22 | 5.7 | 4.6 | 2.2 | 0.10 | | 50–100 | 7.80 | 7.95 | 7.73 | −0.22 | 0.13 | 1.8 | 28.32 | 1.20 | 15.4 | 0.20 | 3.4 | 4.3 | 2.4 | 0.09 | | 100–150 | 7.90 | 7.94 | 7.74 | −0.20 | 0.16 | 0.7 | 24.46 | 0.93 | 11.7 | 0.17 | 1.4 | 1.7 | 2.3 | 0.10 |
| | 3 | 0–30 | 7.75 | 7.90 | 7.70 | −0.20 | 0.37 | 3.5 | 51.5 | 4.28 | 23.3 | 0.40 | 7.7 | 6.7 | 2.8 | 0.11 | | 30–80 | 7.79 | 7.93 | 7.74 | −0.19 | 0.20 | 4.6 | 57.16 | 7.00 | 34.7 | 0.25 | 12.1 | 10 | 3.2 | 0.13 | | 80–150 | 7.83 | 7.97 | 7.78 | −0.21 | 0.17 | 4.5 | 58.97 | 5.48 | 29.5 | 0.22 | 10.8 | 8 | 3.7 | 0.09 |
| | 4 | 0–20 | 7.85 | 7.94 | 7.80 | −0.14 | 0.33 | 2.4 | 28.84 | 2.64 | 17.6 | 0.51 | 5.2 | 4.7 | 5.3 | 0.10 | | 20–70 | 7.93 | 8.02 | 7.92 | −0.10 | 0.35 | 3.0 | 28.85 | 1.45 | 16.1 | 0.18 | 5.2 | 1.3 | 4.6 | 0.12 | | 70–95 | 7.80 | 7.92 | 7.75 | −0.17 | 0.30 | 1.0 | 27.29 | 1.03 | 14.4 | 0.18 | 1.84 | 1.5 | 4.8 | 0.11 | | 95–150 | 7.94 | 8.01 | 7.90 | −0.11 | 0.43 | 1.6 | 27.98 | 1.21 | 11.7 | 0.15 | 2.6 | 0.8 | 4.3 | 0.15 |
| | 5 | 0–45 | 7.75 | 7.88 | 7.72 | −0.16 | 0.35 | 1.5 | 58.20 | 1.54 | 15.1 | 0.21 | 2.8 | 0.6 | 6.5 | 0.12 | | 45–150 | 7.90 | 8.04 | 7.85 | −0.19 | 0.38 | 0.3 | 56.45 | 0.37 | 13.2 | 0.20 | 0.4 | 0.5 | 6.4 | 0.13 |
| | 6 | 0–42 | 7.78 | 7.9 | 7.71 | −0.19 | 0.29 | 3.9 | 28.24 | 5.16 | 27.5 | 0.39 | 9.7 | 6.6 | 6.5 | 0.09 | | 42–88 | 7.90 | 8.08 | 7.86 | −0.22 | 0.33 | 2.6 | 23.53 | 2.10 | 19.5 | 0.17 | 5.7 | 4.8 | 5.0 | 0.11 | | 88–150 | 7.89 | 8.06 | 7.87 | −0.19 | 0.16 | 4.8 | 25.36 | 4.92 | 25.8 | 0.23 | 10.8 | 5.8 | 4.5 | 0.12 |
| | 7 | 0–36 | 7.68 | 7.81 | 7.57 | −0.24 | 0.37 | 2.9 | 61.45 | 4.55 | 24.3 | 0.22 | 6.9 | 5.1 | 6.7 | 0.10 | | 36–86 | 7.80 | 7.95 | 7.72 | −0.23 | 0.39 | 2.1 | 60.41 | 5.25 | 26.7 | 0.24 | 5.4 | 6.1 | 6.4 | 0.09 | | 86–150 | 7.84 | 7.98 | 7.80 | −0.18 | 0.29 | 2.9 | 60.67 | 4.96 | 25.8 | 0.26 | 7.5 | 8.9 | 4.5 | 0.10 |
| | 8 | 0–30 | 7.80 | 7.91 | 7.76 | −0.15 | 0.24 | 2.2 | 31.12 | 0.57 | 16.8 | 0.36 | 4 | 2.6 | 4.3 | 0.09 | | 30–70 | 7.85 | 7.89 | 7.83 | −0.06 | 0.25 | 2.1 | 31.90 | 0.80 | 18.4 | 0.24 | 3.8 | 2.2 | 4.8 | 0.06 | | 70–150 | 7.81 | 7.85 | 7.78 | −0.07 | 0.26 | 3.3 | 28.5 | 0.66 | 17.5 | 0.18 | 6 | 2.7 | 4.3 | 0.07 |
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OC: organic carbon; SAR: sodium adsorption ratio; CEC: cation exchange capacity; Fed: dithionite citrate bicarbonate; CCE: calcium carbonate equivalent; EC: electrical conductivity.
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