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Ključne besede: PEFC, catalyst layer, platinum–copper, degradation, ionomer, electrochemical impedance spectroscopy, membrane electrode assembly
Objavljeno v DiRROS: 23.06.2023; Ogledov: 351; Prenosov: 181
Celotno besedilo (2,26 MB)
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Povzetek: The soil organic carbon (SOC) was determined in soils of enclosed karst depressions (dolines) (NW Dinaric Mts.) to define their potential for organic carbon sequestration. SOC was measured in the forest, succession (scrubland), and grassland plots at the bottom of dolines at four depths (0–40 cm) and for 40 cm soil layer SOC stock was calculated. We demonstrated that the prevailing fine soil fractions, the C/N ratio and soil thickness play a positive role in the storage capacity of SOC in dolines regardless land use type. Grasslands have the lowest SOC storage capacity (106 t/ha/40 cm), while the highest SOC storage capacity is in succession plots (130 t/ha/40 cm). The last are covered by shrub communities dominated by Prunus spinosa, forming dense communities, and are typical of abandoned croplands or meadows that have been impacted by high levels of nutrients during cultivation phase. At this stage, there is no additional nutrient input in studied plots, which lowers the nutrient content and increases the C/N ratio. C/N ratio is the highest in the forest, where SOC stock capacity is 116 t/ha/40 cm. Given the trend towards the abandonment of agricultural land at Kras Plateau (SW Slovenia), we can expect more overgrowth of dolines, and thus an increase in carbon stocks and stabilization of organic carbon in forest soils. In contrary, we noticed the alarming decrease in grasslands and increase in urban land. The SOC storage in 2020 was for 12,538 t/ha/40 cm lower than in 2002. Although grasslands showed the lowest SOC storage, their contribution to total SOC storage in dolines is very important. Since there is a lack of studies on carbon stocks in doline soils, our research is of great importance and a novelty and gives an important background for further research on SOC stock in karst landscapes worldwide.
Ključne besede: organic carbon sequestration, karst, grassland, forests, scrubland, dolines
Objavljeno v DiRROS: 20.04.2023; Ogledov: 374; Prenosov: 242
Celotno besedilo (6,74 MB)
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Povzetek: Fossil remains of chondrichthyan tooth bases (roots) were found in Lower Permian beds exposed along the forest road between Dovje and Plavški Rovt. These layers are part of the clastic development of the Trogkofel Group beds. They are composed of an alternation of dark to light-grey shales, siltstone, and sandstone with rare beds of the conglomerate. Within the clastic succession, layers or lenses of dark-grey to black limestones (biosparitic, biomicritic and oolitic) and limestone breccias occur. The limestone consists remains of algae, fusulinids, brachiopods, and mostly crinoids (Palermocrinus and Entrochus). Detail study has shown that two remains of tooth bases belong to the genus Petalodus, one of them to the species Petalodus ohioensis. The bases are tongue-shaped and come to a rounded point in the distal (base end) edge. On the surface of the base, the typical oval-shaped foramina are visible. In addition, the osteodentine is visible on the cross-section of one specimen. Teeth of Petalodus are often the most common chondrichthyan fossil vertebrate remains reported from the Carboniferous and Permian rocks of the USA, Europe, and Russia. In Slovenia, Petalodus ohioensishas been recorded only from Upper Carboniferous beds. The new record of Lower Permian remains contributes to the knowledge of this cosmopolitan but still common genus of Late Paleozoic chondrichthyans.
Ključne besede: fossils, Petalodontiformes, Petalodus ohioensis, Upper Paleozoic, Artinskian, Karavanke Mountains, Slovenia
Objavljeno v DiRROS: 18.01.2023; Ogledov: 553; Prenosov: 250
Celotno besedilo (5,26 MB)
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Povzetek: Celovita presoja vplivov na okolje (CPVO) je postopek, s katerim je mogoče ugotoviti in oceniti vplive načrtovanih ukrepov načrta na okolje ter vključenost zahtev drugih inštitucij v načrt. Skladno z Zakonom o varstvu okolja (ZVO-2) je treba CPVO izvesti tudi za načrte s področja gozdarstva. V okviru obnove območnih gozdnogospodarskih načrtov (GGN GGO 2021–2030) ter lovsko upravljavskih načrtov (LUN LUO 2021–2030) je bil za omenjene načrte prvič izveden postopek CPVO, in sicer en postopek za vseh štirinajst GGN GGO 2021–2030 ter en postopek za petnajst LUN LUO 2021–2030. Postopek CPVO se je začel z vsebinjenjem, v okviru katerega je bila na podlagi opredelitve pomembnih vplivov plana skupaj s pristojnim ministrstvom in mnenjedajalci sprejeta odločitev o vsebinah, ki se bodo presojale v nadaljevanju postopka CPVO. Za vsak sklop načrtov je bilo pripravljeno okoljsko poročilo z dodatkom, v katerem so se opredelili, opisali in ovrednotili pomembni vplivi izvedbe obeh sklopov načrtov na okolje, ohranjanje narave, varstvo človekovega zdravja in kulturne dediščine. Vpliv izvedbe GGN GGO 2021–2030 na okoljska cilja Trajnostna raba in varstvo naravnih virov ter Blaženje in prilagajanje na podnebne spremembe je bil zaradi številnih pozitivnih učinkov načrtov ocenjen kot pozitiven (ocena A). Vpliv izvedbe GGN GGO 2021–2030 na okoljska cilja Ohranjena kulturna dediščina in Ohranjena narava je bil zaradi nekaterih pomanjkljivosti v načrtih ocenjen kot C – nebistven vpliv ob upoštevanju omilitvenih ukrepov. Ocenjeno je bilo, da bodo z izvedbo vsakega LUN LUO 2021–2030 nastali nebistveni negativni vplivi (ocena B) na okoljski cilj Trajnostna raba in varstvo naravnih virov in da bo vpliv izvedbe vseh petnajstih LUN LUO 2021–2030 na okoljski cilj Ohranjena narava nebistven zaradi izvedbe omilitvenih ukrepov (ocena C). V obeh okoljskih poročilih so bili navedeni omilitveni ukrepi, ki so bili vgrajeni v osnutke načrtov. CPVO je dolgotrajen in zapleten postopek, ki znatno podaljšuje čas sprejemanja območnih načrtov. Vendar pa zaradi poglobljene presoje mnenjedajalcev in presojevalcev daje načrtom bistveno večjo težo. Hkrati se s CPVO izboljšuje vpetost gozdarskega in lovskega načrtovanja v okoljsko politiko Slovenije, kar daje obema sektorjema večjo veljavo.
Ključne besede: gozdnogospodarsko načrtovanje, lovsko načrtovanje, območni načrti, vplivi načrtov na okolje, okoljsko poročilo, dodatek, omilitveni ukrepi
Objavljeno v DiRROS: 22.12.2022; Ogledov: 560; Prenosov: 156
Celotno besedilo (622,85 KB)

Povzetek: The alpine environment is characterized by complex geology, high-energy terrain, deeply incised river valleys with high erosional potential, extreme weather conditions and dynamic geomorphic processes. Such settings provide favourable conditions for the formation of composite landslides rather than individual slope mass movement phenomena. As an example, we present the kinematics of the composite landslide Urbas in the North of Slovenia which developed in the complex geological and morphological settings characteristic of the alpine environment. The research combines several monitoring techniques and involves the integration of both surface and subsurface displacements measured in the landslide area. The results indicate that the composite sliding process consists of several simultaneous and interrelated types of movements occurring in different segments of the unstable mass that are governed by different mechanisms of displacements, such as rockfall, sliding and debris flow. The kinematic characteristics of a deep-seated landslide that formed in such conditions vary spatially, but is rather homogenuous vertically, indicating translational type of movement. Spatial kinematic heterogeneity is primarily related to the diverse terrain topography, reflecting in different displacement trends. Based on the revealed kinematic proprieties of the sliding material, the sediment discharge illustrates the sliding material balance which estimates the volume of the retaining material that represents the potential for slope mass movement events of larger scales.
Ključne besede: composite landslide, alpine conditions, kinematics, monitoring, sediment discharge
Objavljeno v DiRROS: 15.12.2022; Ogledov: 617; Prenosov: 171
Celotno besedilo (8,00 MB)