Fluvaquentic Subgroup helper (irregular OC decrease + aquic)

Pass when:

• Irregular decrease in organic carbon between 25 cm and 125 cm (or to a densic/lithic/paralithic contact); AND

• Aquic conditions in some horizon within 75 cm (aquic_conditions_usda(pedon, max_top_cm = 75)).

Usage

fluvaquentic_usda(pedon)

Arguments

pedon

A PedonRecord.

Value

A DiagnosticResult.

Details

Implementation: tests whether OC values are non-monotonic (some upward variation) within 25-125 cm.

References

Soil Survey Staff (2022), KST 13ed, Ch. 9.