sierozem

OBS: Près des tchernozems se placent [...] ""les sols gris semi désertiques ou sierozems"" (Soudan, Asie centrale): très pauvres en humus, couche supérieure plus claire que le reste.

OBS: In early U-S. classification systems, a group of zonal soils having a brownish-gray surface horizon and a light-colored subsurface overlying a layer of carbonate accumulation and, sometimes, hardpan. It is developed under conditions of temperate to cool aridity, and under mixed shrub vegetation.