WRB 2022 Ch 5 / Ch 4 Histosols (p 96): organic material formed under the influence of rainwater only (NO surface or groundwater input). Distinguished from Rheic by its low pH (rainwater is naturally acidic and unbuffered) and low base saturation. Practical proxy: Histosol Order with weighted-mean pH_h2o <= 4.5 in the upper 100 cm AND no carbonates (calcaric / calcium-rich evidence absent).
Arguments
- pedon
A
PedonRecord.