scholarly journals Locality 'Jozića Koliba' in Serbia: The forest community characteristics

2015 ◽  
pp. 93-101
Author(s):  
Milorad Veselinović ◽  
Suzana Mitrović ◽  
Snežana Stajić ◽  
Nevena Čule ◽  
Dragica Vilotić ◽  
...  

The memorial complex "Jozića Koliba" is situated within the boundaries of Obrenovac Reserve forest complex. A special value of this locality is its group of protected pedunculate oak trees, which consists of six protected trees aged approximately 200 years with their crown projections. The idea to protect not only the trees themselves, but also their immediate surroundings of which the forest community forms a part, imposed the need for studying and describing the community. The study of current forest vegetation was performed according to the principle of French-Swiss school Braun-Blanquet, J (1921,1928). In total, 33 species were identified in the forest community. In the tree storey, three species were identified: Quercus robur L., Fraxinus Angustifolia Vahl. and Acer campestre L. In the herb layer, two legally protected species were identified: Ruscus aculeatus L. and Viola odorata L. The presence of nine different areal types, dominated by species of sub-central-European flora element, was established by means of a phytogeographic analysis. According to the results of the analysis of life-form representation, this community is of a phanerophyte-hemicryptophyte type, with an increased presence of geophytes.

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Saray Martín-García ◽  
Ivan Balenović ◽  
Luka Jurjević ◽  
Iñigo Lizarralde ◽  
Krunoslav Indir ◽  
...  

The height to crown base (hcb) is a critical measure used in many investigations as an input variable to investigate the vigour of the stands, the social position of the trees, and to evaluate the behaviour of forest fires, among other uses. Though measuring height-related variables in the field is always time-consuming, the foremost benefits offered by modelling hcb are that it permits to generalize and average a very uneven attribute and, furthermore, provides insights about which tree and stand variables have a significant impact on hcb. However, there are many species in which models of the crown base height have not been developed in Croatia. The objective of this research was to develop a height to base crown model for each of the main species present in the two-layered mixed stands of this study. According to previous investigations, logistic models provide the highest precision and require the lowest inventory cost owing to less frequent measurements. Tree- and plot-level variables with distance-independent competition indexes were studied in the fitting model. In this research, we obtained models for the main stand species: Acer campestre (root mean squared error (RMSE) = 2.28 m, R2 = 82.80%); Alnus glutinosa (RMSE = 1.78 m, R2 = 85.36%); Carpinus betulus (RMSE = 2.47 m, R2 = 67.55%); Fraxinus angustifolia (RMSE = 2.46 m, R2 = 82.45%); Quercus robur (RMSE = 2.60 m, R2 = 80.57%); Tilia sp. (RMSE = 2.01 m, R 2 = 89.07%); and Ulmus laevis (RMSE = 1.71 m, R2 = 92.42%). The combination of the total height, tree, and plot-level variables with distance-independent competition indexes contributed to the prediction accuracy of proposed model significantly.


2021 ◽  
Vol 13 (1(22)) ◽  
pp. 13-20
Author(s):  
Petru Cuza ◽  

Extreme weather events with high temperatures and strong sunlight have increased alarmingly in the last few decades, considerable affecting plant photosynthesis. In this study, the impact of thermal stress on photosystem II activity in the leaves of pedunculate oak trees (Quercus robur L.) of different ecological origin was assessed. Four days after the thermal shock application with a temperature of 50°C during 20, 40, 60 minutes, the processes of recovery on photosystem II activity in the leaves of the oak trees in the investigated provenances took place with different speed and fullness. The recovery of the functional state of photosystem II in the leaves of the trees showed that in the environmental conditions of the ,,Plaiul Fagului” reservation territory an advanced thermotolerance to the thermal stress action was specifi c for the origin from the north of the country (Edinet). The leaves of the trees of local and southern origin showed a low resistance to the thermal stress action. The advanced adaptation capacity, the high growth rate of the trees from the northern provenance suggest that the acorn harvested from the oaks of northern origin can be used for the works of extension of the afforestation areas in the central area of the Republic of Moldova.


Trees ◽  
2011 ◽  
Vol 26 (2) ◽  
pp. 321-330 ◽  
Author(s):  
Teresa Martínez ◽  
Nieves Vidal ◽  
Antonio Ballester ◽  
Ana M. Vieitez

Hacquetia ◽  
2010 ◽  
Vol 9 (1) ◽  
pp. 91-150 ◽  
Author(s):  
Romeo Pietro ◽  
Mattia Azzella ◽  
Laura Facioni

The Forest Vegetation of the Tolfa-Ceriti Mountains (Northern Latium - Central Italy)The forests of the Tolfa-Ceriti mountains (Latium, central Italy) were investigated through a phytosociological approach. 249 relevés were performed and treated with multivariate analysis. 13 woodland communities were identified, of which 7 belong toQuercetalia pubescenti-petraeae, 1 toFagetalia sylvaticae, 1 toPopuletaliaand 4 toQuercetalia ilicis. The thermophilous Turkey oak-forests occurring on the trachytic hills of the Ceriti Mountains and on the flysch substrates of the Tolfa Mountains were included inRubio peregrinae-Quercetum cerridisass. nova.Quercus cerrisandFraxinus angustifoliasubsp.oxycarpawoodland communities of the footslopes have been ascribed toFraxino oxycarpae-Quercetum cerridis, while the widespread mesophilus Turkey oak forests have been ascribed toMelico-Quercetum cerridis. Cephalantero longifoliae-Quercetum cerridishas been restricted to acid and oligotrophic soils.Quercus petraeawoodlands, occurring on trachytic substrates have been described as a new association namedCarici olbiensis-Quercetum petraeaeass. nova. All these mixed oak woods have been included in the allianceCrataego laevigatae-Quercion cerridisArrigoni 1997. The nomenclatural problems concerning the prior nameTeucrio siculi-Quercion cerridisUbaldi 1988 are also discussed. The beech forests of the higher altitudes have been included inFraxino orni-Fagetum sylvaticae, while theAlnus glutinosaravine woodlands have been described as belonging to the new associationPolysticho setiferi-Alnetum glutinosae. Secondary communities ofAcer monspessulanumandAcer campestredeveloped on flysch substrates, and ofErica arboreaandArbutus unedo(Erico-Arbutetum unedonis) developed on trachytic substrates, have also been identified. Finally two types ofQuercus ilexwood have been identified:Cyclamino repandi-Quercetum ilicis, on sandstones, and the new associationArbuto unedonis-Quercetum ilicisass. nova on volcanic soils. This latter community can be considered as a coenological and geographical vicariant in central Italy of the sicilianErico-Quercetum ilicis.


Author(s):  
С.Н. Кружилин ◽  
Т.Ю. Баранова ◽  
А.А. Багдасарян

Государственный природный заказник "Горненский", расположенный в центральной части Ростовской области, являясь особо охраняемой природной территорией областного значения, имеет уникальные объекты, представленные искусственно созданными лесными насаждениями дуба черешчатого (Quercus robur L.). В современном лесном хозяйстве черноземной зоны дуб черешчатый продолжает занимать лидирующие позиции по хозяйственному значению. Большое внимание при выращивании леса уделяется продуктивности. Насаждения, устойчивые насаждение к болезням, вредителям и неблагоприятным природным явлениям, всегда являются продуктивными и имеют большой показатель запаса древесины на единицу площади. Усыхание дубрав в последние годы становится актуальной проблемой. Основными факторами этих процессов являются повреждения вредителями и инфекционными заболеваниями. Повышению устойчивости деревьев дуба черешчатого в насаждениях способствуют своевременные рубки ухода. Авторы провели анализ посадок дуба черешчатого, сформированных с участием основной сопутствующей породы – клена остролистного. Исследовано 2 варианта лесных культур дуба в условиях сухой дубравы (Д1), определены лесоводственно-таксационные показатели в разные возрастные периоды. Отмечается, что при отсутствии в них плановых рубок ухода в периоды с 25 до 40 и с 35 до 50 лет происходит падение бонитета с 1 до 2 класса. Наряду с этим отмечается суховершинность деревьев, что приводит к задернению поверхности почвы и, соответственно изменению условий произрастания. The Gornensky State NatureReserve,situated in the central part of the Rostov Region, isa protected natural area of regional significance. The reserve contains unique objects, represented by artificially created forest stands of pedunculate oak (Quercus robur L.). In the modern forestry of the Chernozem zone,pedunculate oak continues to take a leading position in terms of its economic value. Much attention is paid to productivity when growing forests. Plantings that are resistant to diseases, pests, and adverse natural phenomena are always productive and have a large stock of wood per unit area. The diebackof oak forests has become an urgent problem in recent years. The main factors of these processes are damage by pests and infectious diseases. Timely improvement felling of oak trees helps to increase the stability of the stands. The authors analyzed plantings of petiolate oak formed with the participation of the main accompanying species– Norwaymaple. Twovariants of forest oak plantationsin the conditions of a dry oak forest (D1) were studied, and forestry and taxation indicators were determined for different age periods. It is noted that in the absence of planned improvement felling in the periods from 25 to 40 and from 35 to 50 years, there is a drop in the yield class from 1 to 2. Along with this, the diebackof trees is noted, which results inthe grassing-downof the soil surface and, accordingly, changes in the growing conditions.


2017 ◽  
Vol 49 (6) ◽  
pp. 561-577 ◽  
Author(s):  
Olga NADYEINA ◽  
Daria ZARABSKA-BOŻEJEWICZ ◽  
Andrea WIEDMER ◽  
Carolina CORNEJO ◽  
Christoph SCHEIDEGGER

AbstractBactrospora dryinais an epiphytic lichen-forming fungus specifically related to old-growth floodplain forests, which have dramatically declined in Europe over the past centuries. In order to promote conservation management of such forest remnants, we aimed to study population genetics of this rare and threatened lichen. The newly developed 16 microsatellite markers are specific for the mycobiont ofB. dryinaand reliably amplify either single fruiting bodies or a sterile thallus. This allows the use of these markers for the identification of sterile crusts and for quantification of recent dispersal of the species into restored habitats. We tested the markers in 264 samples collected from 10 pedunculate oak trees growing in three localities in north-eastern Switzerland. All markers were polymorphic and showed two to five alleles per locus, and unbiased gene diversity varied from 0·06 to 0·71 over three populations. The relatively low number of alleles inB. dryinais possibly the consequence of colonization of secondary habitats created by forest management. Although oaks were largely covered with a single, continuousB. dryinacolony, the microsatellite markers identified single or complex multi-genotype colonizations per tree. For future population genetic studies, we recommend collection of 5–15 specimens from one tree which would enable detection of 60–80% of the multilocus genotypes present. Hierarchical AMOVA revealed high variation (70%) on host trees, and a relatively high differentiation (12%) among the three locations in NE Switzerland indicated limited gene flow between those regions. Thus, the newly developed markers showed their applicability in population genetics at different spatial scales. They will play an important role in monitoring habitat restoration for the conservation ofB. dryinaand associated forests and riverscapes.


2018 ◽  
Vol 47 (3) ◽  
pp. 669-675 ◽  
Author(s):  
Izabela Kot ◽  
Katarzyna Rubinowska

2005 ◽  
pp. 9-29 ◽  
Author(s):  
Dragan Karadzic ◽  
Tanja Milijasevic

The most frequent fungus species known as powdery mildews, causing the diseases of forest trees, were studied. Among forest woody species, oaks are especially susceptible to powdery mildew attack, and among them pedunculate oak (Quercus robur L) is highly endangered. This paper reports 49 species of powdery mildews. However, Microsphaera alphitoides has the greatest significance in forest economy, causing the decline of seedlings in nurseries and also aggravating the natural regeneration of pedunculate oak. This fungus, together with gypsy moth and honey fungus (Armillaria mellea) participates in the dying of old oak trees. Powdery mildews can be successfully controlled by fungicides, and sulphur fungicides Karatan and Rubigan are especially effective.


Sign in / Sign up

Export Citation Format

Share Document