Table 1.
Sampling sites characteristics.
| Sample | pH | pH class | Org C (%) | P (mg/L) | Org C Class | Bulk density | Total C(%) | Total N(%) | FAO texture class | Land Use | Climatic zone | k-mean clusters |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DMK_2 | 4.92 | <5 | 0.99 | 135.44 | <2% | 1.149 | 1.63 | 0.995 | C | Grass | Atlantic | 1 |
| DMK_5 | 6.01 | 5 to 7 | 1.08 | 151.94 | <2% | 1.456 | 1.36 | 1.08 | C | Arable | Atlantic | 1 |
| FRA_1 | 5.36 | 5 to 7 | 0.59 | 43.60 | <2% | 1.489 | 0.794 | 0.594 | M | Arable | Atlantic | 1 |
| FRA_2 | 5.44 | 5 to 7 | 4.18 | 30.45 | 2–15% | 0.748 | 4.56 | 4.18 | M | Grass | Atlantic | 1 |
| FRA_4 | 6.29 | 5 to 7 | 0.45 | 109.75 | <2% | 1.573 | 0.577 | 0.45 | C | Arable | Atlantic | 1 |
| FRA_17 | 5.41 | 5 to 7 | 2.79 | 129.06 | 2–15% | 0.99 | 2.4 | 2.79 | C | Forestry | Atlantic | 1 |
| FRA_18 | 5.33 | 5 to 7 | 4.4 | 23.90 | 2–15% | 0.897 | 5.02 | 4.4 | M | Forestry | Atlantic | 1 |
| FRA_19 | 4.92 | <5 | 4.26 | 12.32 | 2–15% | 0.799 | 4.38 | 4.26 | M | Forestry | Atlantic | 1 |
| FRA_20 | 6.69 | 5 to 7 | 1.24 | 92.34 | <2% | 1.283 | 1.48 | 1.24 | M | Arable | Atlantic | 1 |
| GER_1 | 6.5 | 5 to 7 | 2.89 | 451.46 | 2–15% | na | 4.2 | 2.89 | C | Arable | Atlantic | 1 |
| GER_10 | 4.63 | <5 | 3.66 | 15.24 | 2–15% | 0.89 | 5.06 | 3.66 | C | Forestry | Continental | 1 |
| IRE_1 | 5.81 | 5 to 7 | 1.95 | 56.40 | <2% | 1.364 | 2.51 | 1.95 | M | Grass | Atlantic | 1 |
| IRE_2 | 6.59 | 5 to 7 | 2.03 | 48.05 | 2–15% | 1.411 | 2.35 | 2.03 | M | Grass | Atlantic | 1 |
| IRE_3 | 7.63 | >7 | 1.5 | 56.67 | <2% | 1.273 | 1.84 | 1.5 | M | Arable | Atlantic | 1 |
| IRE_4 | 7.75 | >7 | 1.89 | 108.81 | <2% | 1.363 | 3.73 | 1.89 | M | Arable | Atlantic | 1 |
| IRE_5 | 5.46 | 5 to 7 | 3.95 | 52.08 | 2–15% | 0.935 | 4.66 | 3.95 | M | Grass | Atlantic | 1 |
| IRE_6 | 7.55 | >7 | 2.06 | 145.47 | 2–15% | 0.848 | 2.24 | 2.06 | C | Arable | Atlantic | 1 |
| ITA_1 | 5.2 | 5 to 7 | 4.77 | 26.32 | 2–15% | 0.95 | 5.6 | 4.77 | F | Grass | Alpine | 1 |
| NLD_1 | 7.8 | >7 | 3.02 | 166.35 | 2–15% | 1.341 | 3.71 | 3.02 | F | Arable | Atlantic | 1 |
| NLD_2 | 8.13 | >7 | 1.14 | 94.73 | <2% | 1.474 | 2.4 | 1.14 | M | Arable | Atlantic | 1 |
| SWZ_1 | 6 | 5 to 7 | 3.42 | 314.31 | 2–15% | 1.11 | 4.03 | 3.42 | M | Grass | Alpine | 1 |
| SWZ_4 | 7.78 | >7 | 3.17 | 27.33 | 2–15% | 1.028 | 4.5 | 3.17 | F | Arable | Alpine | 1 |
| UKM_2 | 7.52 | >7 | 3.17 | 237.58 | 2–15% | 0.983 | 3.71 | 3.17 | M | Arable | Atlantic | 1 |
| UKM_5 | 4.31 | <5 | 2.73 | 10.14 | 2–15% | 1.024 | 3.24 | 2.73 | C | Forestry | Atlantic | 1 |
| UKM_6 | 7.01 | >7 | 3.78 | 98.26 | 2–15% | na | 5.03 | 3.78 | M | Grass | Atlantic | 1 |
| UKM_8 | 5.31 | 5 to 7 | 1.9 | 61.00 | <2% | 0.87 | 3.22 | 1.9 | C | Grass | Atlantic | 1 |
| UKM_10 | 5.58 | 5 to 7 | 3.06 | 31.28 | 2–15% | 0.92 | 3.95 | 3.06 | C | Grass | Atlantic | 1 |
| FRA_3 | 5.19 | 5 to 7 | 5.54 | 197.31 | 2–15% | 0.714 | 6.54 | 5.54 | M | Grass | Atlantic | 2 |
| FRA_7 | 5.15 | 5 to 7 | 7.41 | 55.87 | 2–15% | 0.824 | 9.49 | 7.41 | M | Grass | Continental | 2 |
| FRA_8 | 5.35 | 5 to 7 | 5.13 | 41.03 | 2–15% | 0.909 | 6.14 | 5.13 | M | Grass | Continental | 2 |
| FRA_12 | 8.05 | >7 | 2.19 | 22.99 | 2–15% | 1.451 | 6.61 | 2.19 | F | Arable | Continental | 2 |
| FRA_13 | 6.89 | 5 to 7 | 7.61 | 71.00 | 2–15% | 0.778 | 8.09 | 7.61 | F | Grass | Continental | 2 |
| GER_3 | 7.47 | >7 | 8.89 | 70.81 | 2–15% | na | 9.1 | 8.89 | F | Grass | Continental | 2 |
| GER_4 | 7.36 | >7 | 11.3 | 14.44 | 2–15% | na | 12 | 11.3 | F | Forestry | Continental | 2 |
| GER_8 | 7.42 | >7 | 5.66 | 177.65 | 2–15% | na | 6.13 | 5.66 | F | Grass | Continental | 2 |
| GER_9 | 3.96 | <5 | 18.6 | 16.93 | >15% | 0.301 | 16.1 | 18.6 | M | Forestry | Continental | 2 |
| SLO_1 | 7.24 | >7 | 9.49 | 77.23 | 2–15% | 0.719 | 10.7 | 9.49 | M | Grass | Alpine | 2 |
| SLO_2 | 6 | 5 to 7 | 6.17 | 6.77 | 2–15% | 0.789 | 6.9 | 6.17 | F | Grass | Alpine | 2 |
| SLO_3 | 7.65 | >7 | 11.3 | 36.00 | 2–15% | 0.77 | 12.5 | 11.3 | M | Grass | Alpine | 2 |
| SLO_5 | 7.08 | >7 | 15.9 | 18.58 | >15% | 0.425 | 15.9 | 15.9 | F | Forestry | Alpine | 2 |
| SWE_4 | 3.7 | <5 | 8.21 | 135.45 | 2–15% | 0.209 | 9.89 | 8.21 | M | Forestry | Continental | 2 |
| SWE_5 | 4.03 | <5 | 9.46 | 90.76 | 2–15% | na | 10.6 | 9.46 | M | Forestry | Alpine | 2 |
| SWZ_2 | 5.14 | 5 to 7 | 6.56 | 60.12 | 2–15% | 0.756 | 7.54 | 6.56 | F | Grass | Alpine | 2 |
| SWZ_3 | 6.54 | 5 to 7 | 5.81 | 101.63 | 2–15% | 0.835 | 6.78 | 5.81 | F | Grass | Alpine | 2 |
| SWZ_5 | 5.5 | 5 to 7 | 5.04 | 196.62 | 2–15% | 0.899 | 6.26 | 5.04 | M | Grass | Alpine | 2 |
| UKM_1 | 6.62 | 5 to 7 | 7.15 | 21.57 | 2–15% | 0.82 | 7.29 | 7.15 | F | Forestry | Atlantic | 2 |
| UKM_3 | 7.42 | >7 | 8.48 | 22.64 | 2–15% | 0.694 | 9.7 | 8.48 | F | Grass | Atlantic | 2 |
| UKM_7 | 7.68 | >7 | 5.37 | 99.35 | 2–15% | 0.729 | 8.27 | 5.37 | F | Arable | Atlantic | 2 |
| UKM_9 | 7.31 | >7 | 7.8 | 136.82 | 2–15% | 0.779 | 8.79 | 7.8 | F | Grass | Atlantic | 2 |
| UKM_12 | 7.52 | >7 | 6.73 | 26.89 | 2–15% | 0.787 | 9.05 | 6.73 | F | Grass | Atlantic | 2 |
| UKM_13 | 5.12 | 5 to 7 | 5.51 | 24.26 | 2–15% | 0.684 | 6.83 | 5.51 | M | Grass | Atlantic | 2 |
| DMK_1 | 4.48 | <5 | 16.5 | 52.92 | >15% | na | 23.8 | 16.5 | Org | Forestry | Atlantic | 3 |
| FRA_16 | 5.15 | 5 to 7 | 19 | 36.51 | >15% | 0.477 | 20.1 | 19 | Org | Grass | Continental | 3 |
| SWE_3 | 3.97 | <5 | 32.1 | 77.02 | >15% | 0.271 | 31.5 | 32.1 | Org | Forestry | Boreal | 3 |
| SWE_7 | 3.93 | <5 | 31.4 | 169.09 | >15% | na | 33 | 31.4 | Org | Forestry | Boreal | 3 |
| DMK_3 | 6.03 | 5 to 7 | 1.59 | 386.06 | <2% | 1.246 | 2.02 | 1.59 | C | Arable | Continental | 4 |
| DMK_4 | 7.88 | >7 | 1.01 | 36.66 | <2% | 1.336 | 1.38 | 1.01 | M | Arable | Continental | 4 |
| FRA_5 | 7.84 | >7 | 2.32 | 24.13 | 2–15% | 1.081 | 2.72 | 2.32 | VF | Arable | Atlantic | 4 |
| FRA_9 | 5.75 | 5 to 7 | 2.14 | 244.71 | 2–15% | 0.978 | 2.4 | 2.14 | M | Arable | Continental | 4 |
| FRA_10 | 8.23 | >7 | 1.72 | 3.64 | <2% | 1.43 | 6.06 | 1.72 | MF | Arable | Mediterranean | 4 |
| FRA_11 | 7.55 | >7 | 1.73 | 48.44 | <2% | 1.237 | 2.17 | 1.73 | M | Grass | Mediterranean | 4 |
| FRA_14 | 6.54 | 5 to 7 | 2 | 34.78 | 2–15% | 1.171 | 2.26 | 2 | F | Arable | Continental | 4 |
| FRA_15 | 7.55 | >7 | 2.33 | 35.10 | 2–15% | 1.274 | 2.87 | 2.33 | F | Grass | Continental | 4 |
| GER_6 | 6.95 | 5 to 7 | 1.55 | 126.87 | <2% | 1.221 | 1.87 | 1.55 | M | Arable | Continental | 4 |
| GER_12 | 6.37 | 5 to 7 | 3.58 | 17.13 | 2–15% | na | 4.31 | 3.96 | MF | Grass | Continental | 4 |
| GER_13 | 6.79 | 5 to 7 | 2.03 | 96.40 | 2–15% | 1.069 | 2.23 | 2.03 | M | Arable | Continental | 4 |
| ITA_3 | 6.4 | 5 to 7 | 1.24 | 17.87 | <2% | 1.328 | 1.37 | 1.24 | MF | Grass | Continental | 4 |
| ITA_4 | 7.01 | >7 | 1.53 | 57.22 | <2% | 1.568 | 1.84 | 1.53 | M | Arable | Continental | 4 |
| ITA_7 | 7.35 | >7 | 2.29 | 316.01 | 2–15% | 1.218 | 2.94 | 2.29 | M | Arable | Continental | 4 |
| POR_2 | 5.16 | 5 to 7 | 1.36 | 69.49 | <2% | 1.009 | 1.73 | 1.36 | M | Forestry | Mediterranean | 4 |
| POR_4 | 6.1 | 5 to 7 | 0.83 | 31.45 | <2% | 1.493 | 1.19 | 0.833 | M | Arable | Mediterranean | 4 |
The texture classes are Coarse (C), Medium (M), Medium-Fine (MF), Fine (F), Very Fine (VF), and Organic (Org). The following abbreviations have been used: Org C, Organic carbon; Org C Class, Organic C class; P, phosphrous; Total C, total carbon; Total N, total nitrogen. The last column corresponds to the k-mean classification of the different soils based on their physicochemical characteristics and land use type. The sampling sites for which soil properties were missing have not been included in the K mean classification and are presented as nd (not determined).