Volume 10 (2005)

THE CYBERNETIC MODEL FOR THE MONITORING OF THE CROPS AND THE SPONTANEOUS VEGETATION ON THE DAMMED AREAS

VALENTIN PANAIT

Within this paper there are exposed a few aspects regarding the monitoring of the soils, crops and spontaneous vegetation evolution, in the frame of the dammed and drainage areas of the Danube Delta Biosphere Reserve. In this purpose, the cybernetical models are very useful in order to understand the evolution of the agricultural dammed areas, as well as many types of the terrestrial and aquatic ecosystems. These models offer a good platform for mathematical simulation of the soil, vegetation and crops evolution, as well as an analyzing tool of the different processes within the agricultural dammed areas.

PRELIMINARY STUDY OF BRYOPHYTES SPECIES FROM CAMÂNCA VALLEY (TARCÃU MOUNTS)

GEORGE ROŞU

This paperwork represents a list of bryophytes species from Camânca Valley (Tarcãu Mounts). The bryophytes flora from Tarcãu Mounts was previously presented in only one article published in 2004 by Gorea Laura and Barabaº Victoria -“Supports on the study of bryophyta from the Tarcãu mountains (Bacãu county)” where authors mentioned 77 species. The biological material analyzed was collected in the summer of the year 2004.

CONTRIBUTIONS TO THE KNOWLEDGE OF THE ANATOMICAL STRUCTURE OF SOME HALOPHYTES. I.

MARIUS GRIGORE, CONSTANTIN TOMA

A thorough knowledge of the anatomical structure of salt marsh plants the halophytes - is especially important from both a theoretical (if considering the mechanisms that assure halophytes survival in conditions of increased salinity) and a practical point of view (finding out of the most efficient methods for a complex upgrading of the salty soils and, implicitly, of the species that might be cultivated on such soils). The representatives of the Chenopodiaceae family have been subjected to anatomical investigations, mainly because of an interesting phenomenon occurring in the structure of such plant’s roots and stems: the phenomenon of supranumerar cambium. Out of the contributions devoted to such a phenomenon, special mention should be made of the synthesis studies of Solereder (1899), Metcalfe and Chalk (1972), as well as those of Toma et al. (1991, 1994) and Niþã (1992), who analyzed the structure of the vegetative organs in the Chenopodiaceae family representatives. Having all these in view, the opinion of the authors of the present study is that, although having been approached by several researchers, the species of the Chenopodiaceae family are still to be analyzed from various perspectives, especially on considering the influence of the environmental factors (substrate’s salinity, firstly) on their anatomical structure.

PHYTOCOENOSES OF THE CLASS ELYNO-SESLERIETEA BR.-BL. 1948 FROM THE CEAHLÃU MOUNTAIN

OANA ZAMFIRESCU, TOADER CHIFU, CIPRIAN MÂNZU

The Ceahlãu Mountain belongs to the Moldavian Oriental Carpatians and, according to its morphology, petrography, structure and genesis, pertains to the flysch mountain category [14]. It is a complex of peaks derived from a main higher summit, which displays a north-south orientation. The dominant main summit consists in a plateau with two levels; it is approximately 10 Km long and less than 1 to 3 km wide. The main summit has an irregular surface, and it is boarded by steep slopes that can often exceed 150 m [2]. The class Elyno-Seslerietea is represented in the study area by 3 associations (5) of the alliance Festuco saxatilis-Seslerion bielzii Coldea 1984, order Seslerietea albicantis Br.-Bl. et Jenny 1962: Ass. Diantho tenuifolii-Festucetum amethystinae Coldea 1984, Ass. Seslerio bielzii-Caricetum sempervirentis Puºcaru et al. 1956, and Ass. Seslerio-Festucetum versicolor Beldie 1967 [11].