21. Study of a modified melamine sponge and its lipophilic and hydrophobic propertiesYuan Ma, Tao Li, Fei Jiang, Sheng Ma, Xiaomeng Wu, Weijie Wang, Zhenfa Zi, Wenliang Chen, Ping Na, 2022, original scientific article Keywords: super hydrophobicity, oil-water separation, melamine sponge, oily pollutants
Published in DiRROS: 22.06.2022; Views: 504; Downloads: 103
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22. Study of water adsorption on EDTA-modified LTA zeolitesJanez Volavšek, O. L. Pliekhov, Olena Pliekhova, Gregor Mali, Nataša Zabukovec Logar, 2022, original scientific article Keywords: 4A zeolite, 5A zeolite, LTA topology, water adsorption, EDTA dealumination, 27Al NMR, 29Si NMR
Published in DiRROS: 09.05.2022; Views: 695; Downloads: 415
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23. Repository of drought event impacts across the danube catchment countries between 1981 and 2016 using publicly available sourcesJiří Jakubínský, Monika Bláhová, Lenka Bartošová, Klára Steinerová, Jan Balek, Petra Dížková, Daniela Semerádová, Daniel Alexandru, Galia Bardarska, Sabina Bokal, Gregor Gregorič, Gal Oblišar, Andreja Sušnik, 2019, original scientific article Abstract: Drought directly and indirectly affects human society in a number of ways. In many regions of the world climate change will exasperate the effects of droughts, affect national economies more intensely. The main aim of this article was to catalogue and analyze the drought impacts in the 11 Central and South Eastern European states located in the Danube river basin. The identification of dry episodes was based on information from publicly available sources, namely, newspaper and journal articles that reported drought impacts. Information on drought impact occurrences was classified into one of five defined categories in which the drought impact report was most clearly manifested (i.e., agriculture, forestry, soil systems, wildfires and hydrology). In terms of the spatial distribution of drought impacts, individual recorded events were analyzed at the level of EU NUTS regions (or their equivalent in non-EU countries). The analysis highlights country-specific vulnerability to drought. Furthermore, gradual increases in drought events and the number of reported impacts were identified, which was particularly evident in the agricultural sector.
Keywords: drought impact, Danube basin, agriculture, climate change, water stress
Published in DiRROS: 21.04.2022; Views: 840; Downloads: 379
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24. The environmental impact of historical Pb-Zn mining waste deposits in SloveniaMiloš Miler, Špela Bavec, Mateja Gosar, 2022, original scientific article Abstract: Mining waste deposits (MWDs) represent significant and constant pollution source for the environment worldwide, thus it is very important to identify and diminish their environmental impacts. The aim of this study was to determine long-term environmental impacts and their temporal variations of MWDs in Pb–Zn mining districts in Slovenia and assess stability of potentially harmful element (PHE)-bearing phases in stream water. The results showed that investigated MWDs are important source of PHEs in stream sediments and that PHEs mostly occur as fine-grained and liberated PHE-bearing ore minerals. MWDs have generally stronger impact on sediments of smaller streams draining MWDs and main streams close to their confluences, however, fine-grained PHE-bearing material is transported along major watercourses over long distances causing regional pollution. Main ore minerals are mostly soluble in stream water. However, measured PHE leaching potential of MWDs is negligible. PHE levels in stream waters are thus low, demonstrating that drainage of MWDs predominantly contributes to PHE pollution in solid particulate form. Possible long-term remediation solution that would reduce environmental impact is recovery of metals from fine grain size fractions of MWDs, which could become an effective practice in sustainable management of historical MWDs. However, further studies of MWDs’ secondary resource potential, processing technology and evaluation of environmental aspects of extraction are needed.
Keywords: metals, stream sediment, stream water, characterisation, mineral solubility
Published in DiRROS: 03.03.2022; Views: 681; Downloads: 512
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25. Infiltration processes in karst aquifers affected by large-scale forest disturbancesUrša Vilhar, Mitja Ferlan, Janez Kermavnar, Erika Kozamernik, Aleksander Marinšek, Metka Petrič, Tanja Pipan, Daniel Žlindra, Nataša Ravbar, 2021, published scientific conference contribution abstract Keywords: karst hydrogeology, global environmental changes, large-scale forest disturbances, aquifer recharge, water monitoring
Published in DiRROS: 03.12.2021; Views: 1108; Downloads: 691
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26. Water regulation ecosystem services following gap formation in Fir-beech forests in the Dinaric KarstUrša Vilhar, 2021, original scientific article Abstract: This paper investigates how variation in forest structural characteristics affects the water retention capacity of gaps and forests in fir-beech forests in the Dinaric Karst. Forests are identified as a key element of the landscape for provision of pristine water resources, particularly in highly vulnerable karst aquifers characterized by rapid infiltration of recharge water, high subsurface permeability, and heterogeneous underground flow. Indicators of hydrologic fluxes (drainage flux, canopy interception, transpiration, and soil evaporation) in a large experimental gap (approximately 0.2 ha in size) and those in a nearby old-growth gap were compared over a 13-year period using the Brook90 hydrological model and their structural characteristics were analyzed. In addition, the hydrologic fluxes were also simulated for a managed forest and an old-growth forest for reference. Water regulation capacity was lowest in the experimental gap, where drainage flux accounted for 81% of precipitation and the sum of canopy interception, transpiration, and soil evaporation (evapotranspiration) accounted for 18%. This was followed by the old-growth gap, where drainage flux accounted for 78% of precipitation and evapotranspiration for 23%. Water retention capacity was highest and generally similar for both forests, where 71%72% of annual precipitation drained to the subsurface. The results of this study suggest that the creation of large canopy gaps in fir-beech forests in the Dinaric Karst results in significant and long-lasting reduction in soil and vegetation water retention capacity due to unfavorable conditions for successful natural tree regeneration. For optimal provision of water regulation ecosystem services of forests in the Dinaric Karst, small, irregularly shaped canopy gaps no larger than tree height should be created, mimicking the structural characteristics of naturally occurring gaps in old-growth forests.
Keywords: water retention capacity, drainage flux, evapotranspiration, Brook90 hydrological model, experimental canopy gap, old-growth forest
Published in DiRROS: 05.03.2021; Views: 999; Downloads: 825
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27. Hyperspectral remote sensing of grapevine drought stressMonika Zovko, Uroš Žibrat, Matej Knapič, Marina Bubalo, Davor Romić, 2019, original scientific article Keywords: vineyard, soil, precision, irrigation, water stress, hyperspectral imagery
Published in DiRROS: 14.05.2020; Views: 2401; Downloads: 1404
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28. Surface structure-activity relationships of Cu/ZnGaO [sub] x catalysts in low temperature water-gas shift (WGS) reaction for production of hydrogen fuelVenkata D. B. C. Dasireddy, Karmina Rubin, Andrej Pohar, Blaž Likozar, 2020, original scientific article Keywords: syngas, hydrogen, ▫$Cu/ZnGaO_x$▫ catalyst, water-gas shift, WGS, steam reforming reactions, fuel cell systems
Published in DiRROS: 12.03.2020; Views: 1936; Downloads: 751
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29. Effect of spatial scale and harvest on heterogeneity of forest floor CO2 efflux in a sessile oak forestEva Dařenová, Matjaž Čater, 2020, original scientific article Abstract: Soil respiration is the second largest flux of carbon between terrestrial ecosystems and the atmosphere and it is substantially sensitive to climate change. Monitoring CO2 efflux and its upscaling from field measurements to the ecosystem level is a complex task, due to the high spatial and temporal variability of the fluxes. Human intervention, e.g. through forest harvest, may change both CO2 efflux and its spatial heterogeneity. The objective of our study was to quantify spatial heterogeneity of soil CO2 efflux within and among plots distributed within a topographically variable sessile oak forest stand before and after harvesting. Forest floor CO2 efflux, soil temperature and soil water content were measured monthly in a sessile oak forest during two growing seasons: one before and one after harvesting. Stand structure characteristics (gap fraction, leaf area index, tree number and size) and the amount of understory also were determined. Relationships between individual variables and spatial heterogeneity were analyzed. The small-scale spatial heterogeneity (expresses as the coefficient of variation) of forest floor CO2 efflux and soil water content (SWC) in the undisturbed forest was low, at maximum 0.22 and 0.13, respectively. Studied variables had no effect on spatial heterogeneity of forest floor CO2 efflux except for the amount of understorey vegetation which positively correlated with forest floor CO2 efflux. Although the studied forest was situated in topographically variable terrain, we observed that inter-plot heterogeneity of forest floor CO2 efflux was lower than that within plots. Stand harvest increased the intra-plot heterogeneity of forest floor CO2 efflux but did not affect the inter-plot heterogeneity. This leads to the conclusion that the number of positions within an individual plot should increase after harvest but the number of plots may remain unchanged to determine adequately ecosystem forest floor CO2 efflux.
Keywords: gap fraction, LAI, Quercus petraea, soil respiration, soil water content
Published in DiRROS: 20.02.2020; Views: 1901; Downloads: 207 |
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