Synthetic Stagnosol: redoximorphic features in a perched layer
(Bg, 15-50 cm; redox 25%) but the deeper subsoil is well-drained
(BC redox 2%, C redox 0). The decay-with-depth contrast is what
distinguishes stagnic from gleyic. By construction
stagnic_properties passes and
gleyic_properties also passes (the surface redox
qualifies for both); the WRB key tests Stagnosols (#16) and
Gleysols (#9), so a real Stagnosol-typed fixture lands at
Gleysols if both pass – the criteria differ in depth pattern,
which is enough for the diagnostic functions but not for key
precedence in v0.3. This is documented in the test as known
overlap; v0.4 will add a stronger discriminator.
Value
A PedonRecord.