Stagnic properties (WRB 2022) — stagnic

Tests for redoximorphic features driven by perched water. Distinct from gleyic (groundwater): stagnic features appear in upper layers AND redox decreases substantially with depth (the perched layer sits above a slowly permeable subsoil that itself is not saturated).

Usage

stagnic_properties(
  pedon,
  max_top_cm = 100,
  min_redox_pct = 5,
  decay_factor = 3
)

Arguments

pedon: A PedonRecord.
max_top_cm: Maximum top depth (cm) of candidate shallow layers (default 100).
min_redox_pct: Minimum redox feature percent in the shallow layer (default 5).
decay_factor: Required factor of redox decrease with depth (default 3, i.e., deeper redox < shallow / 3).

Value

A DiagnosticResult.

References

IUSS Working Group WRB (2022), Chapter 3, Stagnic properties.