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Table 3 Chemical element concentration and sodicity levels of the Melaleuca forest soils in the study areas

From: An assessment of the carbon stocks and sodicity tolerance of disturbed Melaleuca forests in Southern Vietnam

Forest types Soil layers (cm) pH(KCl) Ca2+ (meq/100 g) Mg2+ (meq/100 g) Na+ (meq/100 g) K+ (meq/100 g) Al3+ (meq/100 g) Fe3+ (mg/100 g) ESP (%) Sodicity
Mean SE Mean SE Mean SE Mean SE Mean SE Mean SE Mean SE Mean SE
Primary Melaleuca on sandy soil (VS1) 0–10 3.97 0.15 1.413 0.75 1.783 1.58 1.790 1.56 0.600 0.47 0.910 0.29 3.303 1.20 32.05 4.28 High
10–30 4.12 0.17 1.065 0.41 1.138 1.02 1.708 1.58 0.383 0.33 0.660 0.24 7.310 2.23 39.78 7.90 High
Regenerating Melaleuca on sandy soil (VS2) 0–10 3.68 0.03 0.690 0.10 0.310 0.10 0.310 0.15 0.155 0.02 1.860 0.14 1.615 0.36 21.16 7.82 High
10–30 3.86 0.04 0.645 0.03 0.175 0.00 0.150 0.02 0.065 0.02 1.280 0.24 1.810 0.56 14.49 2.28 Moderate
Degraded secondary Melaleuca on clay soil with peat (VS3) 0–10 4.12 0.25 7.585 1.82 6.320 1.81 1.705 0.81 0.455 0.19 0.100 0.10 37.155 17.63 10.61 2.37 Moderate
10–30 4.07 0.32 7.585 2.96 5.795 2.59 1.470 0.41 0.705 0.07 1.680 1.64 48.245 7.19 9.45 1.09 Low
Regenerating Melaleuca on clay soil with peat (VS4) 0–10 4.67 0.19 8.845 0.55 6.685 0.58 1.760 0.51 0.585 0.27 0.00 0.00 47.550 16.06 9.85 3.05 Low
10–30 5.00 0.04 5.855 0.33 4.860 0.42 1.320 0.19 0.575 0.18 0.00 0.00 54.825 36.49 10.47 1.27 Moderate
Regenerating Melaleuca on clay soil without peat (VS5) 0–10 4.16 0.26 11.580 4.19 5.557 0.55 1.330 0.24 0.663 0.07 5.533 5.53 67.433 9.03 6.95 0.49 Low
10–30 3.91 0.40 8.603 1.65 5.170 0.08 1.507 0.24 0.717 0.09 8.000 7.02 78.440 10.37 9.42 0.37 Low