Tests whether any horizon meets the calcic horizon criteria. The calcic horizon is a horizon of secondary carbonate accumulation, diagnostic for Calcisols and qualifying many other RSGs.
Arguments
- pedon
A
PedonRecord.- min_thickness
Minimum thickness in cm (default 15).
- min_caco3_pct
Minimum CaCO3 percent in fine earth (default 15).
Details
Sub-tests called:
test_caco3_concentration– CaCO3 >= 15%.test_minimum_thickness– thickness >= 15 cm.
v0.2 limitations: the WRB criterion of "5% absolute or relative more CaCO3 than the underlying horizon" is not enforced; this captures true calcic horizons but may also mark uniformly carbonate-rich substrates that are not pedologically calcic. Cementation (petrocalcic) is not yet detected. Both refinements are scheduled for v0.3.
v0.9.314
The WRB calcic horizon follows WRB 2022 Ch 3.1.4 (p. 37-38) criterion by
criterion: criterion 2 is protocalcic properties (secondary carbonates on
\(\ge\) 5% of the exposed area, secondary_carbonates_pct) or
\(\ge\) 5% more CaCO3 than an underlying layer with no lithic
discontinuity between; a layer of a petrocalcic horizon is not calcic; the
15 cm are those of the adjoining layers. A layer whose criterion 2 cannot be
decided (secondary carbonates not recorded) is undecided, not calcic. The
USDA calcic horizon and the SiBCS horizonte calcico keep the earlier
reading.