Omorika Digital repository of the Faculty of Forestry, University of Belgrad
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Taxonomical characteristics of greek maple (Acer heldreichii Orph.) on Trebević in Bosnia and Herzegovina (Republic of Srpska)
No full textPlaninski masiv Trebević u Bosni i Hercegovini (Republika Srpska) predstavlja severozapadnu granicu rasprostranjenja planinskog javora (Acer heldreichii Orph.), endemične i reliktne vrste Balkanskog poluostrva. U radu su vršena taksonomska istraživanja u populaciji planinskog javora na osnovu analize morfoloških karakteristika listova 10 odraslih stabala. Utvrđeno je prisustvo dva varijeteta, var. heldreichii i var. macropterum, a u okviru var. macropterum su utvrđene tri forme: f. typicum, f. dissectum i f. rotundiloba. Značajna taksonomska varijabilnost vrste na proučavanom nalazištu će povećati verovatnoću za opstanak populacije ne proučavanom lokalitetu, naročito u uslovima klimatskih promena i olakšati njenu in situ konzervaciju
Management of red deer (Cervus elaphus) population in the hunting ground Đerdap (Eastern Serbia)
No full textReintroduction of red deer (Cervus elpahus) into the forest complexes of Eastern Serbia began in 1960,
while the Đerdap hunting ground was established in 1990, and its border coincides with the border of
the Đerdap National Park established in 1974. This hunting ground comprises a narrow-forested belt
of irregular shape along the Danube (total area 63,730 ha, length 100 km, width from 2 to 8 km),
located at an altitude of 63 to 803 m. The hunting-productive area for red deer covers 20,000 ha, and
its estimated number was 360 individuals in spring 2024 (sex ratio approx. 1:1).
The aim of this study was to analyse the development dynamics of the newly established red deer
population in the wider Đerdap area (period 1960-2020), focusing on the trophy structure and age of
individuals hunted in the Đerdap area in two periods: 1993-2002 (54 trophies) and 2007-2020 (73
trophies), respectively. The age was estimated by the skilled commissions based on the tooth wear. The
trophies were evaluated according to the International Council for Game and Wildlife Conservation
(CIC) method. Each parameter was analysed using descriptive statistics by determining the range of
variation, arithmetic mean, standard deviation, and coefficient of variation. A simple regression
analysis was used to establish a correlation between the antler parameters and the age of the
individual. In addition, relevant information was collected from annual and long-term hunting ground
management plans and from records of works carried out in each hunting year. In 2017 and 2018,
intensive field research was carried out as a part of the SRBREDDEER project, funded by the Forest
Directorate of the Ministry of Agriculture, Forestry and Water Management of Republic of Serbia
The impact of land use management on soil organic carbon stock in the area of mt. Goč
No full textForest ecosystems and forest soils play a significant influence in climate
change adaptation and mitigation. Due to their high carbon storage
potential, the soil plays a crucial role in regulating the global carbon cycle.
Soils have the capacity to accumulate vast carbon reserves, making this
one of their primary roles in the global carbon balance. Increased
atmospheric CO2 concentration can foster biomass growth, potentially
leading to an increase in total carbon stored in the soil. Organic carbon is
the most important indicator of soil quality. The assessment of soil
conditions and quality within the territory of the Republic of Serbia is
governed by laws and aligned with objectives defined in various national
strategies.
The research was conducted within the Goč teaching and research
base of the Faculty of Forestry, in separate experimental watersheds
characterized by different soil and vegetation conditions. In the area of the
ameliorative Unit B, three experimental watersheds were designated (R-I
black pine, spruce, R-II meadow association, and R-III black pine
plantation, while within the management Unit A, one experimental
watershed was selected (Vaona under beech-fir forest). Soil samples were
taken from a representative area as composite samples, each consisting of
5 individual samples, and forest floor samples were also collected. The goal
is to determine the reserves of organic carbon in soils under black pine on
previously degraded habitats, as well as in the soils of beech and fir
ecosystems.
By comparing the organic carbon density from 30 years ago with the
current values, it can be concluded that the organic carbon content has
increased at all locations, with a particularly noticeable increase in the
areas of Ravnina III and Ravnina II. This is mainly attributed to land use
practices, as the process of pedogenesis has proceeded uninterrupted over
the past 30 years under the black pine plantation. In Ravnina I, smaller
differences in soil organic carbon density were observed, which were
influenced by the necessary management practices. The least changes in
organic carbon reserves were found in soil samples from the Vaona watershed, under the mixed forest of beech and fir, which can be explained
by the ecological and productive characteristics of the beech-fir mixed
forest in Goč. The beech and fir forest potentially has a more stable and
long-lasting humus layer, with microclimatic conditions and microbial
activity further influencing carbon sequestration processe
Abelian and Tauberian results for the fractional Hankel transform of generalized functions
No full textThis paper aims to explore the quasiasymptotic behaviour of distributions through the fractional Hankel transform. We present Tauberian result that connects the asymptotic behaviour of generalized functions in the Zemanian space with the asymptotics of their fractional Hankel transform. Additionally, we establish both the initial and final value theorems for the fractional Hankel transform of distributions
Превенција бујичних поплава и ерозије земљишта – Србија 2025. године
No full textБујичне поплаве представљају један од најучесталијих и најразорнијих облика природних непогода у Србији, са знатним утицајем на животну средину, инфраструктуру и безбедност становништва. Најизраженије су у сливовима Јужне, Западне и Велике Мораве, као и у подручјима Колубаре и Дрине, где се јављају као последица интензивних краткотрајних падавина, стрмих терена и високог степена ерозионих процеса, који захватају више од 70% територије земље. Недовољна примена превентивних мера, ограничени финансијски ресурси и недовољна институционална координација доприносе порасту ризика. Истиче се потреба за интегралним управљањем бујичним сливовима, пошумљавањем, применом савремених метода мониторинга и доследном имплементацијом законских прописа ради унапређења превенције, смањења последица и јачања отпорности друштва на будуће екстремне догађаје
Gene Pool Characterization Of Field Elm (Ulmus Minor Mill.) In The Area Of Natural Monument Zvezdara Forest
No full textGene pool characterization involves the process of identifying, describing and assessing
the genetic diversity of a particular species for the purpose of its conservation and
sustainable use. It is particularly important for species that are rare and endangered
and whose gene pool is represented by a relatively small number of trees in a certain
area, such as the field elm (U. minor Mill.) in the NM Zvezdara Forest. Field elm is native
species, classified as a rare/endangered in forest fund of the Republic of Serbia. Due
to climate change, Dutch elm disease and urbanization of natural habitats, field elm
populations are decreasing, and the remaining trees are often physiologically weakened.
In the study area, which is part of the urban green infrastructure of Belgrade, the field
elm is a valuable component of flora that contributes to the aesthetic and ecological
richness, and it is an important part of its green identity. In order to monitor, conserve
and sustainably use the gene pool of this species, research was conducted to identify,
georeference and map the trees that best represent the population. The field survey
began in 2024. In May 2025, the population of more than 100 trees was recorded,
of which 59 trees were selected, georeferenced and measured for height, DBH, and
maximum horizontal crown projection. The average height of the recorded trees is
11.69 m, the average diameter at 1.30 m is 15.44 cm, while the average maximum
horizontal crown projection is 6.21 m. The trees are in satisfactory health, with fruit
presence recorded on 25 individuals in the spring of 2025. The collected data represent
the basis for the long-term monitoring and characterization of the field elm gene pool,
which will be carried out in the coming years with the aim of conserving the genetic
resources of the species and their sustainable use in the urban environmen
CLONAL TRIAL OF FIELD ELM AS A BASIS FOR EX SITU GENE POOL CONSERVATION IN THE PROTECTED AREA “KOSMAJ” (BELGRADE, SERBIA)
No full textField elm (Ulmus minor Mill.) is a rare and endangered species in Serbia. This species has an essential ecological role, providing habitat for many different organisms and supporting biodiversity in general, while being susceptible to different biotic threats and changing environmental stressors. The decline of natural populations of field elm is primarily caused by Ophiostoma ulmi and Ophiostoma novo-ulmi. This pathogen is vectored by bark beetles (Scolytus sp.), rapidly spreading and leading to death of mature individuals. Within the protected area “Kosmaj” the population of field elm has faced significant fragmentation, as it currently exists only as individual trees or small groups. Considering its role in maintaining genetic diversity and ecosystem stability of “Kosmaj”, the implementation of in situ and ex situ conservation methods is important for species existence. This study presents a basis for long-term ex situ conservation of field elm trees. From the investigated population of 50 georeferenced individuals or groups of trees, softwood cuttings were collected from 9 phenotypically healthy trees during early June 2025. Vegetative propagation was conducted in glasshouse under controlled conditions, by placing cuttings in containers (35x25x14 cm) filled with peat and perlite (1:4 ratio) to a depth equivalent to 1/3 of their total length, under 5 second mist every 5 minutes, and treated with rooting hormone (dry-dip method, 0.2% IBA). After initial root formation observed in August 2025, plants were transferred from the glasshouse to outdoor conditions for acclimatization. Significant variation of rooting success was observed in September 2025, ranging from 5.71% (PB-24) to 83.33% (PB-28), with average rooting rate of 26.39%. Future research should be continued and expanded, by obtaining more information on field elms genetic variability essential for its adaptive potential
ASSESSING THE RESTORATIVE QUALITIES OF URBAN AND SUBURBAN FORESTS THROUGH A GUIDED NATURE-BASED INTERVENTION
No full textUrban forests are increasingly recognized as crucial environments for supporting mental well-being, yet their restorative qualities and the mechanisms through which people experience them remain insufficiently explored. This study investigates how individuals perceive the sensory dimensions of forest environments in Belgrade, Serbia, and evaluates the short-term therapeutic potential of a structured forest therapy walk. The research aims to deepen understanding of how different forest settings—urban versus suburban—may differentially support psychological restoration.
The study was conducted in two contrasting forested areas: Bojčin Forest, a suburban protected natural monument characterized by old-growth oak stands and remnants of once-extensive lowland swamp ecosystems, and Košutnjak Forest, a centrally located urban woodland dominated by recreational trails and mixed deciduous–coniferous vegetation. These environments were selected to capture ecological, experiential, and sensory variability across distinct forest types.
A sample of eighteen university students was divided into an experimental group (n = 9), who took part in a guided two-hour forest therapy walk, and a control group (n = 9), who walked independently along the same route without therapeutic guidance. Before and after the intervention, participants completed the Profile of Mood States (POMS) questionnaire to assess changes in emotional well-being, as well as a survey evaluating perceived sensory dimensions (PSDs) of the forest environment, including qualities such as serenity, naturalness, diversity, coherence, openness, sheltered areas, cultural and social elements, and comfort.
Results indicate that both guided and unguided forest walks led to improvements in mood, reflected in more favorable post-intervention POMS scores. Participants consistently rated Bojčin Forest as higher in several restorative sensory dimensions, including serene, cultural, natural, diverse, cohesive, open, and comfort, highlighting its stronger perceived restorative character relative to Košutnjak.
Overall, the study emphasizes the inherent therapeutic value of forest exposure and demonstrates that different forest types may offer distinct experiential benefits. These findings contribute to the growing evidence base supporting nature-based interventions and underscore the importance of preserving diverse forest environments within and around urban areas to enhance public health and well-being
Application of mechanization in the mining operations and land reclamation of the Kolubara surface mine
No full textRudarski basen Kolubara, koji se nalazi u centralnom delu Srbije, predstavlja
jedan od najznačajnijih izvora uglja u zemlji. U radu su analizirani osnovni radovi
na površinskim kopovima, koji obuhvataju otkopavanje uglja, transport i odlaganje
jalovine, kao i prateće radove, među kojima su čišćenje terena, oblikovanje kosina i
rekultivacija.
Razmatrana je uloga osnovne rudarske mehanizacije (rotorni bageri, trakasti
transporteri i odlagači) i pomoćne mehanizacije (dozeri, grejderi, kamioni i dr.),
koja je od ključnog značaja za povećanje efikasnosti i smanjenje troškova radova.
Međutim, eksploatacija uglja dovodi do značajnih ekoloških problema, kao što su
degradacija zemljišta, zbog čega je proces rekultivacije koji obuhvata tehničku i
biološku restauraciju narušenih površina od presudne važnosti. Ukazano je na
postupak i značaj rekultivacije površina u okviru rudarskog basena Kolubara, u cilju
stabilizacije terena, zaštite od erozije i ponovnog uključivanja površina u prirodne
ili ekonomske sisteme, kao što su poljoprivreda ili šumarstv
The influence of tree species on microhabitat value in mixed European Beech (Fagus Sylvatica l.) and Silver Fir (Abies Alba mill.) stands on Goč
No full textHabitat trees play a key role in preserving biodiversity of forest ecosystems because they provide microhabitats necessary for the survival of numerous endangered species. The objective of this research was to examine the difference in microhabitat values between beech (Fagus sylvatica L.) and fir (Abies alba Mill.) in mixed forests of Mount Goč in central Serbia. The basis for this research was three experimental fields of 0.5 ha each. On experimental fields all trees were numbered, their diameter at breast height (dbh) was measured and their microhabitat value was determined. The analysis showed that beech has significantly larger microhabitat values compared to fir on all experimental fields, which was confirmed by applying non-parametric statistical tests. The significant differences in microhabitat values between the researched areas are also determined by statistical analysis, primarily due to different representation of fir. Larger microhabitat values in beech can partially be explained by larger diameters of its trees, since previous studies indicate a significant influence of dimensions of trees on forming of microhabitats. The results obtained emphasize the importance of tree species and its structure for biodiversity preservation and indicate the need of inclusion of habitat trees in strategies of sustainable forest management