This table provides the site metadata and soil physico-chemical characterization for each of the 768 sampling points of the HIGH-PBS dataset, distributed across 29 sites in the Italian Alps and Apennines (1,875–3,120 m a.s.l.) and surveyed between 2010 and 2023. For every sampling point the table reports: a unique Event label, latitude and longitude in WGS84 (EPSG:4326) and the original easting/northing in ETRS89-LAEA Europe (EPSG:3035), elevation above sea level, a landform type code (CS = stable slope, DG = debris-covered glacier, F1 = glacier foreland deglaciated 100 y, RGa = active rock glacier, RGr = relict rock glacier, SF = snowfield, SS = active scree slope), a landform class (1 = soil without ice, 2 = debris without ice, 3 = debris with ice), the site code, the estimated deglaciation year (where applicable) and the sampling year(s). Soil variables derived from laboratory analyses of surface samples collected next to each plot are also included: grain-size distribution (gravel, sand, silt, clay fractions, %), soil reaction (pH, measured in 1:2.5 soil:water suspension), total organic carbon (g/kg, dry combustion with elemental analyser), soil organic matter (g/kg, Walkley-Black method; for the Breuil site derived from C/N ratio) and calcium carbonate content (%). Grain-size was determined by the hydrometer method after skeleton separation (>2 mm), H₂O₂ oxidation of organic matter and wet sieving of the sand fraction; the pipette method was used at the Breuil site only. Coordinates were acquired in the field with handheld GPS devices (positional accuracy 2 mm), * Soil, sand fraction [%]: sand content (0.063-2 mm), * Soil, silt fraction [%]: silt content (0.002-0.063 mm), * Soil, clay fraction [%]: clay content (<0.002 mm), * Soil pH: soil reaction, * Soil, carbon content [g/kg]: total organic carbon, * Soil, organic matter [g/kg]: soil organic matter (loss on ignition), * Soil, calcium carbonate [%]: CaCO3 content.Notes: * Missing values: empty cells indicate data not available for that sampling point, * 17 sampling points (Cos, Mal, Por, Rec sites) lack geographic coordinates due to unrecoverable GPS data, * Deglaciation year may contain year ranges (e.g., 1980-1920) indicating the estimated time interval during which deglaciation occurred at that plot, * Sampling year may contain year ranges (e.g., 2010-2011) for sites sampled over consecutive years; reported activity densities are aggregated across the full sampling period.