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Povzetek: Raziskava obravnava smrekove gozdove, ki so pod neposrednim emisijskim vplivom termoelektrarne Šoštanj, in sicer tiste predele, kjer je bila povprečna osutost krošenj v letu 1988 od 26% - 60%. V 15 naključno izbranih ploskvah je povprečna osutost krošenj v letu 1994 ocenjena z 19,3% do 37,0%. Zaradi osutosti krošenj so zmanjšani širina branike, temeljnični prirastek in lesna proizvodnja. Tekoči volumenski prirastek se je zaradi osutosti krošenj vobdobju 1989 - 1993 zmanjšal za 11%, v obdobju 1984 - 1988 pa za 19%
Ključne besede: tekoči volumenski prirastek, propadanje gozdov, onesnaženost ozračja
Objavljeno v DiRROS: 23.08.2023; Ogledov: 347; Prenosov: 96
Celotno besedilo (5,27 MB)

Ključne besede: gozdarstvo, kmetijstvo, varstvo pri delu, cestna vožnja, izredni prevoz, kmetijska vozila, gozdarska vozila, spremstvo izrednih prevozov
Objavljeno v DiRROS: 18.08.2023; Ogledov: 334; Prenosov: 105
Celotno besedilo (5,35 MB)

Ključne besede: gozdarstvo, nezgode, varstvo pri delu, Slovenija
Objavljeno v DiRROS: 27.07.2023; Ogledov: 373; Prenosov: 127
Celotno besedilo (6,80 MB)

Povzetek: The purpose of this study was to identify the ostracod assemblage from a 43 m thick section of the Bizeljsko Formation, which constitutes the middle part of the Upper Miocene Posavje Group. The succession comprises sandstone, siltstone, and marlstone, deposited in a delta front environment. The determined ostracods belong to the families Cyprididae, Cytheridae, Darwinulidae, and Loxoconchidae. In total, 30 species were identified. Additionally, 8 morphotypes were determined at the genus level. The most common genera are Candona, Hemicytheria, and Cyprideis. The assemblage belongs to the Caspiocypris labiata subzone from the upper Pannonian. The ostracod assemblage from the Krško Basin is similar in species composition to Pannonian ostracod assemblages from Croatia and Serbia.
Ključne besede: Lake Pannon, Bizeljsko Formation, Pannonian, biostratigraphy, palaeoenvironment
Objavljeno v DiRROS: 27.07.2023; Ogledov: 293; Prenosov: 147
Celotno besedilo (8,96 MB)

Povzetek: The COVID-19 pandemic has increased the use of disposable plastics, including medical masks, which have become a necessity in our daily lives. As these are often improperly disposed of, they represent an important potential source of microplastics in the environment. We prepared microplastics from polypropylene medical masks and characterised their size, shape, organic chemical leaching, and acute toxicity to the planktonic crustacean Daphnia magna. The three layers of the masks were separately milled and characterised. Each of the inner frontal, middle filtering, and outer layers yielded different types of microplastics: fibres were obtained from the inner and outer layer, but irregular fragments from the middle layer. The shape of the obtained microplastics differed from the initial fibrous structure of the intact medical mask layers, which indicates that the material is deformed during cryo-milling. The chemical compositions of plastics-associated chemicals also varied between the different layers. Typically, the inner layer contained more chemicals related to antimicrobial function and flavouring. The other two layers also contained antioxidants and their degradation products, plasticisers, cross-linking agents, antistatic agents, lubricants, and non-ionic surfactants. An acute study with D. magna showed that these microplastics do not cause immobility but do physically interact with the daphnids. Further long-term studies with these microplastics are needed using a suite of test organisms. Indeed, studies with other polypropylene microplastics have shown numerous adverse effects on other organisms at concentrations that have already been reported in the environment. Further efforts should be made to investigate the environmental hazards of polypropylene microplastics from medical masks and how to handle this new source of environmental burden.
Ključne besede: COVID-19 pandemic, plastics-associated chemicals, Daphnia magna, fibres, fragments, nanofibres, polypropylene microplastics, single-use plastic
Objavljeno v DiRROS: 05.05.2023; Ogledov: 339; Prenosov: 213
Celotno besedilo (3,28 MB)
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