Trophicity it’s an important characteristic of forestry resorts. The trophic potential of non – degraded natural ecosystems can be explained by the potential global trophicity index. The objective of the presented work is to show the influence of forest vegetation, represented by Douglas of 40 year old and Sessile oak (Quercus petraea) of 70 year old, on the global potential trophicity of a epihipostagnic luvosoil from the area of Tinca Forest District, U.P. 3 Gepis. The humus quantity is higher in case of Sessile oak than in case of Douglas all depth long of the profile, with 0,14 – 11,94 % an exception being the clay accumulation horizon of Btw argic. The degree of basic saturation is superior on the profile under Douglas compared to the profile under sessile oak with values between 2,11 % and 4, 31 %. The ratio between the edaphic amount represented by soil amount, less than the soil occupied by skeleton and the amount of tree roots and the amount of the analyzed soil was appreciated of 0,9. If in the first two horizons the two soils are included in silty sandy loam textural subclass, in the ElwBtw transitional horizon will pass from the silty sandy loam to the silty loam and in the illuvial argic horizon Btw go from the medium clayey loam to the silty clayey loam. Estimated bulk density values according to textural classes of the soil horizons are between 1, 30 g/cm in the bioaccumulation horizon A for both soil profiles; and between 1,37 and 1,39 g/cm3 in the horizon of accumulation Btw clay. The analyses of the soil were made by the „County Office for Pedological and Agrochemical Studies Oradea” in accordance to the „Methodology of Elaborate Pedological Studies” – The Research Institute for Pedology and Agrochemistry, Bucharest.

Douglas forest; sessile oak forest; proxihipostagnic luvosoil; trophicity

Presentation: oral