The cryic STR summer temperature criteria differ based on the presence or absence of O horizon and saturated conditions
Cryic (Gr. kryos, coldness; indicating very cold
soils).—Soils in this temperature regime have a mean annual temperature between 0 and 8 ᵒC but do
not have permafrost.
1. In mineral soils the mean summer soil temperature (June, July, and August in the Northern
Hemisphere and December, January, and February in the Southern Hemisphere) either at a depth of 50
cm below the soil surface or at a densic, lithic, or paralithic contact, whichever is shallower, is
as follows:
a. If the soil is not saturated with water during some part of the summer and
(1) If there is no O horizon: between 0 and 15 ᵒC; or
(2) If there is an O horizon: between 0 and 8 ᵒC; or
b. If the soil is saturated with water during some part of the summer and
(1) If there is no O horizon: between 0 and 13 ᵒC; or
(2) If there is an O horizon or a histic epipedon: between 0 and 6 ᵒC.
[x] Saturation (@ 50cm) can be toggled for a single simulation
[x] O horizon presence/absence can be toggled for a single simulation
[x] The grid-based methods (SpatRaster) should allow for a presence/absence grids of saturation and O horizon to be supplied
These changes will be incorporated in PR #6 which seeks to fix calculation issues (and extend them) for frigid/cryic determination.
The cryic STR summer temperature criteria differ based on the presence or absence of O horizon and saturated conditions
These changes will be incorporated in PR #6 which seeks to fix calculation issues (and extend them) for frigid/cryic determination.