Anthric horizons (WRB 2022)

Tests for any of five anthropogenic surface horizons recognised by WRB 2022 (hortic, irragric, plaggic, pretic, terric). Diagnostic of Anthrosols. Two alternative paths qualify:

1. Designation: any layer's designation contains one of hortic|irragric|plaggic|pretic|terric.

2. Property-based: a surface layer (top_cm <= 5) at least min_thickness_cm cm thick (default 20) with elevated dark colour (Munsell value moist <= max_munsell_value, default 4) AND elevated plant-available P (p_mehlich3_mg_kg >= min_p_mg_kg, default 50).

Either path qualifies.

Usage

anthric_horizons(
  pedon,
  min_thickness_cm = 20,
  min_p_mg_kg = 50,
  max_munsell_value = 4
)

Arguments

pedon

A PedonRecord.

min_thickness_cm

Minimum thickness for the property-based path (default 20).

min_p_mg_kg

Minimum plant-available P (Mehlich 3, mg/kg) for the property-based path (default 50).

max_munsell_value

Maximum Munsell value moist for the property-based path (default 4).

Value

A DiagnosticResult.

References

IUSS Working Group WRB (2022), Chapter 5, Anthrosols.