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Four Aleppo pine trees (Pinus halepensis Mill.) have been recorded in Miljakovac park in Belgrade. Aleppo pine is a xerothermic and oligotrophic species originating from the Mediterranean and very rarely cultivated in Serbia. Tree heights and diameters at breast height were measured, as well as the dimensions of needles. The trees are healthy, not attacked by diseases and pests, and are fruit-bearing. Given the climate changes that are causing an increasingly warmer climate in Serbia, xerothermic Mediterranean species that were not suited for cultivation in Serbia in the past could become a significant factor in dendroflora of green areas of urban districts.

Mountain Trebevic in Bosnia and Herzegovina (Republic of Srpska) represents the nortwestern border of the distribution of Greek maple (Acer heldreichii Orph.) an endemic and relic taxon of Balkan Peninsula. Taxonomical research of this species, based on the charactersitics of leaves of 10 normally grown trees was done in this paper. The presence of two varieties is confirmed: var. heldreichii and var. macropterum, and within var. macropterum, three forms were found: f. typicum, f. dissectum and f. rotundiloba. Significant taxonomic variability of the species at the studied site will increase the probability of population survival on the studied locality, especially under conditions of climate change, and facilitate its in situ conservation.

Iceland is located in the North Atlantic Ocean near the Arctic Circle, with a total area of approximately 103,000 km2. The geographical position of the island influences its specific harsh subarctic climate. Phytogeographically, Iceland is located in the Holarctic floristic realm and is part of its Arctic province of the Circumboreal region. Most of the country is located in the tundra zone. Plant cover on the island is quite sparse and only one quarter of the territory is covered with stable vegetation cover, while it is extremely sparse over most of the surface. Uncultivable and barren land (sand fields, lava flows, glaciers) covers 76.0% of the area of Iceland, pastures and meadows 22.7%, forests 1.2%, and only 0.1% of the area is arable. There are three national parks in Iceland: Thingvellir, Vatnaj?kull and Sn?fellsj?kull. The aim of the research is to describe the bioecological characteristics of Iceland, with a special focus on the specifics of the national parks.

Introduction: After the Serbian community hospitals had reached their full capacity during the pandemic, new institutions were enrolled into the coronavirus disease 2019 (COVID-19) system as temporary COVID hospitals (TCH). These hospitals usually had no intensive care units (ICU) and no possibility to treat severely ill patients. The aim of this study was to identify risk factors at the time of triage that could help identify patients that will require ICU treatment and cannot be treated in a TCH. Methodology: In this retrospective study, a total of 158 patients with COVID-19 infection were enrolled. The demographic information, underlying comorbidities, laboratory findings, chest X-rays, computed tomography scans, and clinical outcomes were obtained from medical records. Deterioration of a patient’s condition was regarded as a need for further transfer to ICU. Results: During the hospitalization 15.2% of patients required transfer to ICU. Patients with deterioration were significantly older and there was no difference between genders. We observed a higher prevalence of hypertension, other cardiovascular diseases, lower lymphocyte and platelet counts, and higher IL-6 and troponin T in patients with deterioration. The multivariate logistical regression model showed that only age was an independent risk factor for deterioration and with each year of age, the risk for poor outcome increased by 8%. Conclusions: Patients with cardiovascular risk factors, low lymphocyte and platelet counts, high IL-6 and troponin T and, especially, increased age should not be treated in a TCH because of the high possibility for deterioration and need for transfer to an ICU.

A new motpellier maple (Acer monspessulanum L.) site was described in this paper, located on mountain Boranja, in forest management unit ?Istocna Boranja?, above Roguljski potok, on Glogovita kosa ridge. Montpellier maple occurs on elevations between 460 and 480 m a.s.l., on southwestern and western aspect, on very steep slopes with inclination 45? t? 50?. The site area is 874 m2, ?nd coordinates of site centre are: ?=19?13?49.0? and ?=44?25?21.33?. In this site, Montpellier maple occurs in a plant community of hop-hornbeam and manna ash, and considering that Montpellier maple was recorded in all three layers, and that it occurs abundantly in shrub and ground layers, a subassotiation with montpellier maple was set apart (?stryo carpinifoliae-Fraxinetum orni subass. ?ceretosum monspessulanii). According to floristic composition, most plant species belong to the submediterranean floral type, so this community represents an enclave of submediterranean vegetation in the belt of continental beech forests. The community is of azonal character, orographically-edaphically conditioned, and occurs in warmer aspects, on shallow and skeletal rendzina on oolithic limestones.

This paper presents the alien species Carya illinoinensis (Wangenh.) K. Koch, carya-pecan, (Juglandaceae A. Richard ex Kunth) that has not been mentioned so far in the dendroflora of Serbia. One tree was recorded within the first Serbian sugar factory in Cukarica that is now a protected cultural property in the City of Belgrade. The tree is about 35 years old and about 20 m high. The length of the trunk without branches is 6.0 m and the diameter at breast height is 57 cm. Carya-pecan is a native species of the southeastern part of North America, and is grown in Europe for edible fruits and quality wood. The recorded tree in Belgrade is fruitful and characterized by good vitality and rapid growth. Due to its special characteristics, it can have multiple practical application in the territory of Serbia for decoration in urban areas, for forest plantations and in orchards.

The aim of this research is to use advanced technologies and selected statistical methods to more accurately assess and quantify the spatial distribution of Quercus frainetto (Hungarian oak) in Serbia. The study is based on data from the Second National Forest Inventory of Serbia (NFI-2), conducted between 2019 and 2022. The presence of Hungarian oak was recorded on 1,032 sample plots. For each of these plots, data were extracted from the NFI-2 database, including soil type classified according to WRB, elevation, slope, aspect, and the forest region to which each plot belongs. The data were analyzed using a combination of statistical and spatial methods supported by GIS tools (Kernel Density analysis and Hot Spot/ Getis-Ord Gi* analysis). The results indicate that Hungarian oak most frequently occurs at elevations between 250 and 600 m, on moderately to steeply inclined slopes (10?-25?), and predominantly on south and southwest aspects, confirming its thermophilous character. The highest occurrence was observed on Cambisols, whereas at higher elevations and steeper terrains the species also appears on Leptosols, demonstrating its ability to persist under more restrictive ecological conditions. Kernel Density analysis clearly identified two zones of high concentration of this species: southeastern Serbia, representing the core of its range, and western/ southwestern Serbia as another significant area of increased density. The Hot Spot analysis confirmed statistically significant ?hot spots? in these regions, while ?cold spots? were located in the lowland parts of central and northern Serbia. The applied approach, which integrates NFI data with GIS analyses, enables a clearer and more quantified understanding of the spatial distribution of Hungarian oak, as well as other tree species, providing a more reliable basis for forest management and forest monitoring.

The foreign tree species, Alnus cordata/Loisel./Desf. (Italian alder), (Betulaceae/Loisel./Duby), not previously recorded in the dendroflora of Serbia, is described in this paper. Italian alder trees in an experimental plot in the area of Erdevik, aged 11 years, show good vitality and fast growth, and bear fruits since their 10th year. Tree heights are in range from 10.4 to 16.2 m, and diameters at the breast height range from14.6 to 34.9 cm. The morphological properties of leaves, fruiting organs (?cones?) and male catkins are in concordance with the values in literature sources, although they show great variability. Since the time of plantation establishment, the absolute minimum air temperature in the nearby meteorological station of Sremska Mitrovica was -26.50C, so it can be assumed that the species is frost hardy. On the basis of the researched properties of Italian alder, it can be concluded that this species can be cultivated in Serbia as an ornamental in urban areas and as a fast growing species in forest plantations for biomass production.

This research was carried out in natural stands of sessile oak (Quercus petraea agg. Ehrendorfer 1967) on Miroc mountain. Three comunities were investigated: Pure sessile oak forest (Quercetum montanum Cer. et Jov. 1953. s.l.), sessile oak-common hornbeam forest (Querco-Carpinetum moesiacum Rud. 1949. s.l.) and sessile oak-balkan beech forest (Querco-Fagetum Glis. 1971). Pure sessile oak forests are found on the following soils: dystric ranker and acid cambic soil on sandstone, dystric ranker and acid cambisols on phyllite, and acid cambic soil on schists. Sessile oak-hornbeam forests grow on sandstone, granite and schists. Sessile oak-beech forests are found on acid cambisol on phyllite and sandstone conglomerate. Various ecological conditions (exposition, slope, altitude, soil types and bedrock) on Mt Miroc caused the occurence of diverse sessile oak forest communities, while different states of these forest stands resulted from the implementation of management measures.

This article presents the alien species Carya illinoinensis (Wangenh.) K. Koch, carya-pecan, (Juglandaceae A. Richard ex Kunth) that has not been mentioned so far in the dendroflora of Serbia. One tree was recorded within the first Serbian sugar factory in Cukarica that is now a protected cultural property in the City of Belgrade. The tree is about 35 years old and about 20 m high. The length of the trunk without branches is 6.0 m and the diameter at breast height is 57 cm. Carya-pecan is a native species of the southeastern part of North America, and is grown in Europe for edible fruits and quality wood. The recorded tree in Belgrade is fruitful and characterized by good vitality and rapid growth. Due to its special characteristics, it can have multiple practical application in the territory of Serbia for decoration in urban areas, for forest plantations and in orchards.