TYPES OF ECOSYSTEMS STARTING FROM PHYSICOCHEMICAL PROPERTIES OF HAPLIC LUVISOILS FROM THE FOREST PLAIN OF TIMIŞ FOREST DIRECTORATE

Abstract

Timiş County, a typical plain county, covered by 11% forest stands, has a highly fragmented territory. The studied area is enclosed as altitude in O1 subregion Timiş Plain, meadow and ground depressions oak stands. The investigations were focused on a surface of 7158,9 ha, 5491,3 ha in Lunca Timişului Forest District and 1667,6 ha in  Timişoara Forest District. They were subjected to analysis of their physicochemical characteristics of Haplic Luvisoils, based on the analyses from management plan for forest plains, in productive correlation of forest species in compartments with soil profiles. In order to analyze the synergistic effect of soil physicochemical characteristics on productivity, three soil classes were formed: A) Luvic Phaeozems (Ao-Bt-C), Luvic Phaeozems (Am-Bt-C) and Luvic Phaeozems (Am-BtGo-C); B) Stagnic Luvisoils (Aow-Btw-C) and  C) Stagnic Luvisoils (Aow-El-Bt-C), on soils of Class A, a higher productivity of the stands is achieved, and on the soils of the other two classes by middle or inferior productivity Attempts were made to identify the main less favorable features of soil classes B and C (unbalanced water and air regimes, lower humus content, soil reaction, etc.) which has led to decline of forest stands productivity. Starting from the data obtained from analysis, the studied areas were establish as forest site types, forests types, passing to their ecosystem types.