Phaeozem
From Wicri Urban Soils
Revision as of 17:48, 7 October 2009 by imported>Thierry Daunois (Created page with 'A '''phaeozem''' (PH) can be defined through : * a mollic horizon and : * a base saturation (by 1 ''M'' NH<sub>4</sub>OAc) of 50 percent or more and a calcium carbonate-free soi...')
A phaeozem (PH) can be defined through :
- a mollic horizon
and :
- a base saturation (by 1 M NH4OAc) of 50 percent or more and a calcium carbonate-free soil matrix at least to a depth of 100 cm from the soil surface, or to a contrasting layer (lithic or paralithic contact, petrocalcic horizon) between 25 and 100 cm
and :
- no diagnostic horizons other than an albic, argic, cambic or vertic horizon, or a petrocalcic horizon[1]in the substratum
Source
- The FAO website
Notes
- ↑ A petrocalcic horizon may be present locally (e.g. the "Tosca" in Argentina). Such petrocalcic horizons are considered to be polygenetic and may best be handled for classification purposes at phase level (e.g. Luvic Phaeozem, Tosca phase)
