This article examines the volume of poplar harvesting in state-owned forests of Serbia over the period 2013-2022, using data provided by the Statistical Office of the Republic of Serbia and the National Forest Inventory. In the Materials and Methods section, data on harvested poplar timber from different regions of Serbia were used as the basis for descriptive-quantitative and regression analyses. The results indicate that the total harvested volume amounted to 4,386,540 m?, with the highest annual volume recorded in 2022. Regression analysis shows an upward linear trend, with the coefficient of determination-relating total poplar harvests to the time factor-classified as moderate, along with a moderate correlation and parameters approaching statistical significance. The majority of harvesting was carried out through regular silvicultural fellings, while extraordinary interventions were applied only infrequently. The findings highlight substantial variability in annual harvest volumes, influenced by climatic conditions, market demand, and the implementation of forest management strategies.

Modern scientific research, due to the number of disciplines involved, as a rule requires a larger number of researchers to successfully solve research tasks. In this sense, it is necessary to form a research team and ensure its quality work (personnel, organization, technical and financial resources). Therefore, it is important to familiarize yourself with the concept of a team, the characteristics and types of teams, and especially the research team. In addition, it is important to know how such a team is formed, how it works and how its work is managed. Research teams are specific, because all activities are carried out according to a scientific research project, the form in which the research results will be delivered is defined in advance and explicitly stated in the contract with the client (financier) of the project, most of the team members belong to the category of scientific personnel, it is necessary to hire more scientific and professional disciplines in the performance of tasks, the structure of the team is determined by the number of scientific and professional disciplines, the position of the team members depends more on the scientific and professional requirements of the research (to a lesser extent on hierarchical relationships), the management of the research team requires scientific-professional, organizational-technical and economic-financial abilities, and the team members, during joint work, establish a special type of mutual relations that helps to complete the tasks successfully.

This study examines the applicability of a coarse-resolution digital terrain model (DTM, 90?90 m) for preliminary forest road design in complex karst terrain. The research was carried out in the north-western section of the Forest Manage?ment Area ?Cemernica? (Knezevo, Bosnia and Herzegovina), where two design ap?proaches were compared: a DTM-based zero line traced on a digital contour map in QGIS, and a zero line established by direct field surveying. Both alignments were processed in RoadEng software to analyse geometric parameters, longitudinal pro?file, and earthwork volumes. The preliminary DTM-based alignment reached a length of 1,315 m, whereas the field-based alignment measured 1,333 m, coinciding along 964 m of their total length. Significant discrepancies were detected in earthwork quantities: 1,265 m? of excavation and 1,453 m? of embankment in the DTM-based design, compared to 1,979 m? and 3,012 m?, respectively, in the field-based design. These differences reflect the smoothing effect of low-resolution DTM data, which failed to capture microrelief variations typical of karst landscapes. The findings in?dicate that although coarse DTM may serve for preliminary route planning, it does not provide sufficient accuracy for reliable final design, confirming the necessity of high-resolution elevation data or detailed field surveying for forest road engineering in mountainous terrains.

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.

The beech provenance trial in the ?Goc? Teaching Base was established from 14 Serbian provenances. The assessment of their adaptive and productive potential began with the analysis of the establishment and survival of seedlings. At the same time, damage to seedlings was recorded. The seedling establishment rate at the trial level was 91.4%, while the survival rate was 87.7%. The establishment rate ranged from a minimum of 86.7% (Boranja provenance) to a maximum of 100% (Brezovica provenance). The lowest seedling survival rate was recorded in the Rudnik provenance (77.3%), while the highest was observed in the Brezovica provenance (97.1%). A significant factor contributing to the reduction in seedling survival rate was the presence of freely roaming livestock within the area of the established prov?enance trial. By the end of the first growing season (October, 2024), a total of 33.5% of the seedlings had sustained damage. Approximately half of the damaged seedlings exhibited terminal shoot dieback, while the other half showed signs of ?topped seedling? due to browsing. The initiated research needs to be continued, particularly in the next few years, to draw conclusions about the adaptive potential of the analyzed provenances, which together with the production potential, should be the subject of research over a longer period.

The first results of an analysis of the influence of temperature and precipitation on the growth of Sessile oak in the Djerdap area were obtained from two stands in colder sites. In the study of how various factors influence on radial (RW), latewood- (LW) and earlywood growth (EW) of the mentioned tree species, four methodological procedures were used: 1) correlations between three-month (seasonal) temperature and precipitation values and residual chronology, 2) correlations between monthly temperatures and precipitation and residual chronology, 3) so-called response functions and 4) correlations between the SPEI3 (integrated for 3 months) drought index and residual chronologies. A notable sensitivity of sessile oak to summer precipitation was observed, indicating that higher precipitation, particularly in July, is associated with larger growth increments and healthier trees. No significant influence of temperature on growth increments was detected, except for some correlations between seasonal (3-month) climate factors and growth. Similar to preliminary findings on the effects of precipitation and temperature on the growth of sessile oaks in warmer sites of Djerdap, a more pronounced climate signal is evident in overall radial- and latewood increments, rather than in earlywood growth. The results indicated that sessile oak trees on colder sites are significantly more resistant to the adverse effects of above-average summer temperatures than those on warmer sites in Djerdap, consistent with previous research conducted in Djerdap National Park.

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.

Collectors of non-wood forest products (NWFPs) play a key role as primary participants in the supply chain, yet they are often weakly organized. Their ability to respond independently to market challenges is therefore limited. For this reason, fostering collective action and developing formal structures, such as associations, is essential. These organizations can provide technical and logistical support, facilitate knowledge exchange, and represent their members? interests. This study aims to assess the level of benefits that NWFP collectors associate with membership in producer organizations and to analyze how these perceptions vary depending on their willingness to engage in collective structures. To better capture the nuances of individual attitudes, a fuzzy logic approach was applied. Unlike traditional binary models (e.g., yes/no responses), fuzzy logic allows expectations to be expressed as degrees of membership within categories (e.g., low, medium, high), offering a more flexible analytical framework. A Mamdani-type fuzzy inference system was developed using three input variables: expected support in obtaining collection permits, assistance with applications for subsidies and grants, and access to information about NWFP-related regulations and procedures. Based on defined decision rules, a fuzzy index of perceived support was calculated. The findings indicate that NWFP collectors in Serbia generally have low to moderate expectations regarding the analyzed benefits of joining an association. Moreover, expected benefits are not perceived as isolated elements but as interconnected and complementary. Respondents who anticipate one form of support (e.g., information) are typically likely to expect others (e.g., help with administrative procedures). Importantly, those with higher expectations of support are more inclined to express willingness to join an organization, suggesting that perceived support is a key driver of motivation for collective action and a positive attitude toward association. However, the results also reveal that many collectors still do not fully recognize the range of opportunities and advantages that organized membership can offer.

Macrophytes represent important components of the aquatic ecosystem, providing ecosystem services and mediating nutrient cycling and storage. The aim of this study is to evaluate nitrogen (N) and phosphorus (P) concentrations in aboveground and belowground biomass. The biofilter potential of these three species was evaluated in the context of the shallow eutrophic Lake Palic. Results indicate that most accumulated N is in the belowground biomass, indicating rhizomes and root system as a reservoir of nutrients supporting regrowth. While the P content is different from spatial variability and is mostly related to the concentration of phosphorus in the soil, higher concentrations of P in the underground biomass were more precisely observed in localities where the soils in the immediate vicinity are richer in phosphorus. These findings highlight the ecological function of macrophytes in nutrient cycling and their potential for phytotechnology to lower nutrient loads and sustain ecosystem services in freshwater systems.

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.