RESEARCH REGARDING THE DRAFTING OF A COMPILATION OF LOCAL TABLES REQUIRED TO DETERMINE THE BASE DIAMETER OF TREES DEPENDING ON THEIR DIAMETER MEASURED AT THE STUB

The researches have been conducted in exploitable stands of hill mixed hardwood forestlocated in the north-eastern part of Oltet Piedmont, with the purpose of drafting a compilation of local tables required to determine more precisely the diameter at breast height of trees depending on their diameter measured at the stub, in order to eliminate some systematic errors for particular cases encountered in practice (trees with advanced age and large diameter at the stub, with strongly developed lateral roots, apparent etc.). The results of the researches have materialized in determining the correlative associations between the diameters, in the form of linear regression equations, in which the regression coefficients have been obtained by processing the field data in the Excel application

THE DISTRIBUTION AND STRUCTURE OF THE FOREST NATURA 2000 HABITATS FOUND IN THE SANATORIU AND ARSANCA FORESTS OF THE GOVORA RIVER BASIN

The thematic area  provided in this paper is situated in the Govora river basin, Vâlcea County. Within this study had been aimed the identification, description, diversity, ecological analysis and monitoring of the herbaceos and wooden plant communities, which belong to the Natura 2000 habitats and implicitly of the rare plant species, vulnerable, endemic whitin Sanatoriu and Arsanca Forest from the Govora river basin. In this area we identified the following plant communities: Quercetum petraeae-cerris Sóo (1957) 1969; Carpino-Fagetum  (sylvaticae) Paucă 1941; Scirpetum sylvatici Ralski 1931 emend. Schwich 1944; Petasitetum albae Dihoru 1975; Botriochloetum ischaemi (Kristiansen 1937) Pop 1977, Agrostietum stoloniferae (Ujvárosi 1941) Burduja et al. 1956; Calamagrostetum epigei Juraszek 1928. According to the targets of this research, a very important place we gave to the complex studies of the habitats: 91M0 Pannonian-Balkanic turkey oak sessile oak forests, 9170 Galio-Carpinetum oak-hornbeam forests; 91E0*Alluvial forests with Alnus glutinosa and Fraxinus excelsior (Alno-Padion, Alnion incanae, Salicion albae) ; 6430 Hydrophilous tall-herb fringe communities of plains and of the montane to alpine levels; 6440 Alluvial meadows of river valleys of the Cnidion dubii; 6240*Sub-pannonic steppic grasslands; 3150 Natural eutrophic lakes with Magnopotamion or Hydrocharition-type vegetation; 3160 Natural Dystrophic Lakes and Ponds (Gafta and Mountford coord, 2008). Considering the place where the studies had been located to, the  eco-pedo-climatic conditions and the anthropic term exerted we have considered that is necessary to develop some ecological studies for the plants communities for this habitats from this area

THE COROLOGY, ECOLOGY AND PHYTOSOCIOLOGY OF THE EUONYMO-SAMBUCETUM NIGRAE MOOR 1967 PLANT COMMUNITY IN THE SUBCARPATHIAN AREA OF OLTENIA, ROMANIA

According to the phyto-sociological research carried out between 2007-2018, in the Subcarpathian area of Oltenia, there were identified one important plant community - Euonymo-Sambucetum nigrae Moor 1967. This plant community was not cited until now Oltenia. Since Romania has been mentioned only in Transylvania, by  A. Szabó from Sărățel-Chiraleș-Lechința. For the study of the vegetation in the this area, we have used the methods of phyto-sociologic research characteristic to the Central European phyto-sociologic School, which were based on the principles and methods elaborated by J. Braun-Blanquet (1926). In the phytocoenotic composition of this plant community, beside the dominant species Euonymus europaeus and Sambucus nigra, there are also: Ligustrum vulgare, Rosa canina, Clematis vitalba, Hedera helix, Poa nemoralis. The phytocoenosis have a small number of species, and the species with the highest abundance-dominance (AD) is Sambucus nigra. Euonymus europaeus missing from many phytocenosis. This plant community have been analyzed and characterized from the chorological, ecological, phytosociological point of views. They were also examined according to their floristic composition and physiognomy, syndynamics and economics