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Not?. Abrevieri: N/ha tulpini -num?rul de tulpini la hectar, N/ha Indivizi -num?rul de indivizi la hectar, N, sp -num?rul de specii, D -diametrul, H -?n?l?imea. N/ha tulpini pe specie a fost abreviat prin: Al -alun, Br -brad, Ca -carpen, Ci -cire?, Fa -fag, Ju -jugastru, Mac -m?ce?, Ie -ienup?r, Mp -m?r p?dure?, Mo -molid, Pad -p?ducel, Pam -paltin de munte, Pl -plop, Sn -s?nger, Te -tei, Ul -ulm.
Source publication
The study was performed in a degraded ecosystem by grazing from North-Est of Romania. The aim of the study was to determine main characteristics of primary succession in a pioneer stage initiated on a weathered land by intensive grazing and to identify vegetation classes and potential successional directions. Primary succession analysis was perform...
Citations
... The area of research situated within the commune limits of Vama ( Figure 1) is located on the left side of Moldova River, being bordered in west by Moldoviţa River and Feredeu Ridge (Obcina Feredeului) and in NE by the Great Ridge (Obcina Mare). 3. MATERIAL AND METHOD Data collection was performed according to (Al Piticar & Cenușă, 2014), with a non-systematic stocktaking, in test surfaces of 25 m 2 where the present species and the percentage coverage from the ground survey surface for each species were identified. In the Lala Valley, there were performed a number of 25 ground surveys, and in the Vama area of research a number of 30 ground surveys. ...
ABSTRACT: In the present research, two forest ecosystems have been studied located in the spruce
ecological zone, differentiated by their environmental variables, vegetation levels (Lala Valley - subalpine
level; Vama - mountain level) and by the disturbances directing the ecological succession. Both of them fall
under the pattern of a secondary succession. The ecosystem in the Lala Valley (Rodna Mountains National
Park) is frequently affected by avalanches, whereas the ecosystem in the Vama area (Bucovina Ridges), the
succession’s trigger factor is represented by windfalls. The scope of the research consisted in: i)
determining the stational conditions in the two ecosystems, ii) identifying the vegetation classes; iii)
analyzing the influence of the stational conditions upon the vegetation in the two ecosystems. The
ecological conditions led to the formation of some vegetal communities (vegetation classes). These may be
distinguished by the presence of the diagnostic species and offer important information concerning the
variability of the stational conditions. In the Vama ecosystem, 4 vegetation classes (
Salix, Populus-Sorbus, Picea Coryllus, Populus-Salix), and in the Lala Valley - 3 classes (Pinus m., Vaccinium 1, Vaccinium 2) were identified. It appears that in both habitats, the micro-stational conditions led to the formation of some distinct vegetal communities. The nutrients quantity makes the difference between the two similar classes in the Lala Valley. Moreover, the fertility of the soil influences also the vegetation classes in the Vama area, which has, along with the competition for light, a significant contribution in their formation. To conclude with, we can state that the in the pioneer stage of secondary succession, stational conditions have a greater importance in the ecosystems highly affected by disturbances, compared with the habitats more developed, where the competition is the main factor governing the formation of the vegetal groups.
Keywords: stational conditions, wood species, environment variables, pioneer species, secondary
succession
... For the studied ecosystems, a number of 17 wooden species for each type of habitat and 28 species in total were identified, some of the species being common to both ecosystems (Table 1). For the Bucovina Ridges area, the number of species for phytocoenosis in the pioneer stage is characteristic, also being met in other studies (Piticar & Cenușă 2014;Cenuşă et al 2004). The ecosystems in the pioneer stage from this area are characterized by the high frequency of pioneer species that succeed to colonize and use, in the first stage, the degraded lands affected by disturbances and which present deficiencies in supplying with nutrients. ...
Abstract. The interactions occurred at the pioneer stage which subsequently directs the evolution of composition and vegetation structure still present many unknown facts, the studies being related to a reduced number of ecosystems. The study was conducted in two forest ecosystems from the Bucovina Ridges area, differentiated by ecological factors and component species but being at the same evolution stage (pioneer stage). The aim of this research was to determine the interactions and the interspecific association pattern according to certain ecological gradients, the species diversity and the interspecific competition's level. For the studied ecosystems, there were identified a number of 17 species for each type of habitat and 28 species in total, some of the species being common to both ecosystems. The identification of the constant species, the general and specialized ones has highlighted the influence of ecological conditions from the two habitats but also the type of disturbance. The types of identified associations can be used for ecological reconstruction works of similar habitats from the Bucovina Ridges. The species diversity pointed out the presence of certain ecosystems with low stability, an aspect characteristic for the pioneer stage. The two ecosystems differentiate themselves by their species diversity, the ecosystem from Gura-Humorului region being a bit more developed. It can be therefore concluded that at this successional stage, the type of disturbance has the main role in the distribution and composition of the forest vegetation. The two ecosystems already contain, at the pioneer stage, main species (spruce, beech), which will direct the ecosystems through relations with the other species towards those described by the specialty literature for those areas.
Rezumat. Interacțiunile care apar în stadiul pionier și care dirijează ulterior evoluția compoziției și structurii vegetației prezintă încă multe necunoscute, studiile fiind raportate la un număr redus de ecosisteme. Studiul s-a realizat în două ecosisteme forestiere din zona Obcinilor Bucovinei, diferențiate prin factorii ecologici și speciile componente, dar aflate în același stadiu de evoluție (stadiul pionier). Scopul lucrării a constat în determinarea interacțiunilor și a tiparului asocierii interspecifice în funcție de unii gradienți ecologici, a diversității specifice și a nivelului competiției interspecifice. Pentru ecosistemele studiate s-au identificat un număr de 17 specii lemnoase pentru fiecare tip de habitat și 28 de specii în total, existând și specii comune celor două ecosisteme. Identificarea speciilor fidele, a celor generaliste și specializate au indicat influența condițiilor ecologice din cele două habitate, dar și a tipului de disturbanță. Tipurile de asocieri identificate pot fi utilizate pentru lucrări de reconstrucție ecologică a unor habitate asemănătoare din zona Obcinilor Bucovinei. Diversitatea specifică a indicat prezența unor ecosisteme cu stabilitate scăzută, aspect caracteristic stadiului pionier. Cele două ecosisteme se deosebesc prin diversitatea specifică, cel din zona Gura-Humorului fiind puțin mai evoluat. Se poate deci concluziona că în acest stadiu successional tipul de disturbanță are primul cuvânt în distribuția și compoziția vegetației forestiere. Cele două ecosisteme prezintă deja în stadiul pionier specii principale (molid, fag), care vor dirija ecosistemele, prin relațiile cu celelalte specii spre cele descrise de literatura de specialitate pentru zonele respective. Cuvinte cheie: Specii generaliste și specializate, specii lemnoase, asocieri interspecifice, diversitate specifică, molid, fag.
