Additional files [RJEE Vol. 3 (3). 2018 – 2] Fig. 1. Conceptual ordination of sections in pedology and related sciences between edaphic (edaphology) and genetic (pedology) fields. Fig. 2. Ordination of humus forms according to the classes of soil richness and moisture (based on [27]) with regard to the Alekseyev–Pogrebnyak scale [29].