Iskanje po repozitoriju

A+ | A- | | SLO | ENG

Povzetek: This study examines the occurrence and distribution of root-knot nematodes (RKN), Meloidogyne spp., in Serbia through an official survey conducted from 2021 to 2023. A total of 241 plant and soil samples were collected from 25 districts across two regions: Northern Serbia (Vojvodina Province) and Central Serbia. RKN infestations were detected in 23.7% of the samples. Among the 57 identified populations, 5 Meloidogyne species were recorded: M. incognita, M. hapla, M. luci, M. arenaria and M. javanica. Meloidogyne luci was reported in Serbia for the first time, marking a significant finding for nematology in the region. This study highlights the importance of implementing effective pest management strategies to mitigate the agricultural impact of RKN in Serbia.
Ključne besede: molecular identification, root-knot nematodes, nematodes, morphological identification, distribution, Serbia
Objavljeno v DiRROS: 05.02.2025; Ogledov: 420; Prenosov: 204
Celotno besedilo (831,59 KB)
Gradivo ima več datotek! Več...

Povzetek: Trait-based ecology has recently gained increasing importance in phytoplankton research. In particular, the taxonomic and morphological traits, such as size and shape of phytoplankton cells, can help to unveil the ecological processes and their drivers in the pelagic domain. Our study aims to shed light on the trophodynamics of phytoplankton communities in a coastal ecosystem in the northern Adriatic Sea (Gulf of Trieste) using data on individual traits such as biomass, size and shape of phytoplankton taxa during a one-year study. The phytoplankton parameters were investigated at the levels of the whole community, groups, and individual cells, analysing also the probability distributions of biomass and size of the latter level. The results showed good agreement between abundance and biomass data, as well as individual size and biomass with differences partly explained by cell shapes. We have emphasized the role of the local freshwater source in bottom-up control, alternating with top-down control of phytoplankton dynamics through taxonomic and morphological diversity. The predominant bimodal and non-power law distribution, especially during and around the biomass peaks, confirmed the importance of nano- and microphytoplankton size classes and the role of blooms in destabilizing the trophic webs. We suggest that the analyses of distribution types of individual cell size and biomass can be appropriate to spot ecological processes driving to unconstrained phytoplankton proliferation or to periods of trophic web stability.
Ključne besede: phytoplankton, biomass, taxonomic traits, morphological traits, Northern Adriatic, trophodynamics, pelagic domain
Objavljeno v DiRROS: 08.10.2024; Ogledov: 674; Prenosov: 802
Celotno besedilo (3,13 MB)
Gradivo ima več datotek! Več...

Povzetek: Larch (Larix decidua) showed good growth and adaptability to ecological conditions in Bosnia and Herzegovina. The research aims to determine the variability of the morphological traits of larch in the seed stand near Kakanj, the variability at the beginning of heartwood formation, and correlations among these properties.In the larch seed stand, established by seedlings 2+0 in 1979, an area of 0,45 hectares was set aside. The heights and breast height diameters of the trees were on that area were measured in 2002 and 2020, and the basal area and volume were calculated. In 2020, the trees were drilled at breast height with a Presler drill to measure the proportion of heartwood. Average values of all properties for 2002 and 2020 were calculated. The ten, five and one best trees were selected according to the properties of breast height diameter, height, basal area, volume, and the intensities of selection for these traits were calculated. The Pearson correlation coefficient among all investigated traits were calculated. The average breast height diameter of 41-year-old trees was 24,6 cm, average height 21,8 m, basal area 0.0499m2 and volume 0.3745 m3 (table 1), while in 2002. the average breast height diameter was 15,5 cm, height 18,2 m, basal area 0,020 m2, and volume 0,128 m3 (table 1). Between 2002 and 2020, there was an overtaking of trees in breast height diameter and height and thus the base and volume (table 2). The average larch tree starts heartwood formation at the age of 14 years (table 1). The earliest heart-wood formation occurs in the sixth year (tree 495) and the latest in the 32nd year (table 4). Pearson coefficient showed a high positive correlation between breast height diameter and height in 2002 (ta-ble 9), which means that trees with a good height increase also have a good thickness increase. As a result, the correlation between breast height diameter and basal area and breast height diameter and volume, height and basal area, height and volume, and basal area and volume are statistically signifi-cant. Pearson’s correlation coefficient for the year 2020 showed a negative correlation between the be-ginning of heartwood formation and all other traits (table 10), i.e., trees that formed heartwood earlier have higher values of growth traits.The results will be used in the selection processes of larch individuals with good height and thickness growth and early heartwood formation.
Ključne besede: European larch, morphological properties, core formation, selection
Objavljeno v DiRROS: 25.03.2024; Ogledov: 813; Prenosov: 538
Celotno besedilo (255,90 KB)
Gradivo ima več datotek! Več...

Povzetek: Black poplar (Populus nigra L.) is one of the most important European tree species, inhabiting alluvial habitats along the banks of large rivers. Today, it is one of the most endangered species of forest trees due to habitat devastation, regulation of river flows, excessive exploitation, and the introduction of non-native tree species with which it hybridized. This study aims to determine the variability of morphological properties of black poplar leaves n Bosnia and Herzegovina, within and among populations, and among river basins. Material from the clonal archive of black poplars was researched. The archive was founded in 2005 in Žepče. It contains clones from 161 trees of indigenous black poplars from 26 populations throughout Bosnia and Herzegovina (from the basins of 6 rivers) and 15 hybrid poplar species (table 1 and table 2). Ten leaves were collected from each clone by taking the fifth leaf from the top of the main shoot. Five leaves from each clone were measured. The measurement was performed with a digital movable scale with an accuracy of 0.1 mm and a protractor. The following traits were measured: leaf blade length, leaf blade width, petiole length, total leaf length, the angle between the first lateral nerve and central nerve, and distance from the leaf base to the widest part of the leaf. The number of teeth on one cm above the widest part of the leaf was counted. Data were processed using SPSS 26.0 and EXCEL by populations and river basins. Analysis of variance revealed that there are statistically significant differences among the studied populations (table 4), as well as among river basins (table 7), for all investigated traits. The petiole length trait showed the highest variability, and the lowest variability had the insertion angle of the first lateral and central nerve (table 3). The clones of population of hairy black poplars Čapljina had the lowest values of leaf traits and differed significantly in all measured properties from the others. The most common number of teeth per 1 cm of leaf edge for all populations was four teeth (figure 2), which appeared on 38.3% of leaves. This research gives us a small insight into the morphological characteristics of black poplars in the clone archive Žepče and can be the basis for further researches of the traits of black poplars needed for a successful continuation of work on breeding this species
Ključne besede: european black poplar, clone archive, morphological traits of laeves
Objavljeno v DiRROS: 19.03.2024; Ogledov: 819; Prenosov: 432
Celotno besedilo (991,66 KB)
Gradivo ima več datotek! Več...

Povzetek: The relationship between the quality of forest seedlings and their outplanting survival and growth has long been recognized. Various attributes have been proposed to measure the quality of planted seedlings in forest regeneration projects, ranging from simple morphological traits to more complex physiological and performance attributes, or a combination thereof. However, the utility and meaning of seedling quality attributes can differ significantly among regions, nursery practices, site planting conditions, species and the establishment purpose. Here, forest scientists compiled information using a common agreed questionnaire to provide a review of current practices, experiences, legislation and standards for seedling quality across 23 European countries. Large differences exist in measuring seedling quality across countries. The control of the origin of seed and vegetative material (genetic component of plant quality), and control of pests and diseases are common practices in all countries. Morphological attributes are widely used and mandatory in most cases. However, physiological attributes are hardly used at the operative level and mainly concentrated to Fennoscandia. Quality control legislation and seedling quality standards are less strict in northern European countries where seedling production is high, and quality control relies more on the agreements between producers and local plant material users. In contrast, quality standards are stricter in Southern Europe, especially in the Mediterranean countries. The control of seedling quality based on plantation and reforestation success is uncommon and depends on the conditions of the planting site, the traditional practices and the financial support provided by each country. Overall, European countries do not apply the “target seedling concept” for seedling production except for seed origin. Seedling production in many countries is still driven by traditional “know-how” and much less by scientific knowledge progress, which is not adequately disseminated and transferred to the end-users. Our review highlights the need for greater harmonization of seedling quality practices across Europe and the increased dissemination of scientific knowledge to improve seedling quality in forest regeneration activities.
Ključne besede: forest nursery, forestation, legislation, morphological and physiological quality, standards, forest reproductive material, FRM
Objavljeno v DiRROS: 04.09.2023; Ogledov: 1222; Prenosov: 641
Povezava na datoteko
Gradivo ima več datotek! Več...