The main objective of this work is studying the evolution of some physical-chemical properties of the stagnic luvisoils under the long term influence of the forest vegetation, respective 40 year old Douglas forest (Pseudotsuga menziesii) and 70  year old Sessile oak  (Quercus petraea). The folic unhydromorf O horizons, present on the surface of analyzed soil profiles, has under the Sessile oak a content of 37,02 % humus and 21,47 % of organic carbon while under Douglas 29,8 % and 16,87 %.The different evolution of the chemical properties of stagnic luvisoils is due to organic matter from folianeous horizons, more acid under Douglas. Because of environmental conditions, more aggressive under Douglas forest, as a result to increase of acidity, it produces an intensification of disintegration and deterioration processes, materialized through the growth of clay content and the reduction of dust content.

stagnic luvisoil; Douglas; Sessile oak; folic horizon; clay; dust

Presentation: oral