Soil morphological properties based on the World Reference Base for Soil Resources [30].

<p>Mottling is described in the order of abundance, contrast, shape, and species. The mottled color is expressed in parentheses. Abbreviations: N, None; V, Very few (0–2%); F, few (2–5%); C, Common (5–15%); M, Many (15–40%); A, Abundant (>40%). Contrast: F, Faint; D, Distinct; P, Prominent. Shape: RO, Root-like; FI, Filmy; IR, Irregular; SP, Speckled; CL, Cloudy. Species: Fe, Iron; Mn, Manganese. Concretions are described based on abundance and species. The abbreviations are the same as those used for mottling. The concentrations of Fe2+ ions were related to the strength of the reaction with the 0.2% <i>α</i>-dipyridyl solution in 10% acetic acid. Strength of reaction:–, none; ±, very weak; +, weak; ++, strong; +++, very strong. Rocks are described in the order of abundance, weathering state, size, and shape. Abbreviations: N, None; F, Few (0–5%); C, Common (5–10%); M, Many (10–20%); A, Abundant (20–50%); D, Dominant (>50%). State of weathering: F, Fresh; SL, Slightly weathered; W, Weathered; ST, Strongly weathered. Size: FC, Fine gravel (0.2–1 cm); G, Gravel (1–5 cm); S, Stone (5–10 cm); LS, Large stone (10–20 cm); UN Unknown. The structure of the rocks is described in the order of their grades, sizes, and types. Grade: W, Weak; M, Moderate; S, Strong. Size: VF, Very fine (<5 mm); F, Fine (5–10 mm); M, Medium (10–20 mm); C, Coarse (20–50 mm); VC, Very coarse (>50 mm). Type: SB, Subangular block; PL, Platy; M, Massive; N, None.</p> <p>(DOCX)</p>