1471. Poročilo o stanju na trgu lesnih proizvodov z napovedmi : (Market Statement 2023 ; Slovenija)Špela Ščap, Darja Stare, Nike Krajnc, Tomaž Remic, 2023, elaborat, predštudija, študija Ključne besede: gozdno-lesni sektor, gozdni lesni sortimenti, okrogli les, politični ukrepi, trg lesa, proizvodnja, zunanja trgovina, lesni proizvodi, napovedi tokov lesa, tokovi lesa, les za energetske namene
Objavljeno v DiRROS: 05.01.2024; Ogledov: 307; Prenosov: 78
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1473. Climate change increases the number of landslides at the juncture of the Alpine, Pannonian and Mediterranean regionsMateja Jemec Auflič, Nejc Bezak, Ela Šegina, Peter Frantar, Stefano Luigi Gariano, Anže Medved, Tina Peternel, 2023, izvirni znanstveni članek Povzetek: During the next few decades, changes in rainfall frequency and magnitude are expected to have major impacts on landscape evolution, social, and economic aspects of human society. We focus on seasonal rainfall variations by the end of the twenty-first century to define affected landslide-prone areas, future landslide alerts and the impact of landslides on landscape development in the juncture of the Alpine, Pannonian, and Mediterranean region. A moderate and a worst-case climate scenario from CMIP5 global climate simulations were considered to determine the impact of rainfall on the two most common types of landslides in region, shallow and deep-seated landslides. The observed changes in the occurrence of shallow landslides are significant, especially in the winter months, where we can expect more landslide-prone areas compared to the baseline period. Shallow landslides will have a greater impact on the landscape in spring and summer than deep-seated landslides, especially in vineyards.
Ključne besede: podnebne spremembe, zemeljski plazovi
Objavljeno v DiRROS: 04.01.2024; Ogledov: 341; Prenosov: 88
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1474. Multivariate statistical methods in determining the spatial distribution of chemical elements in soil from the Mavrovo-Rostuše region, North MacedoniaTrajče Stafilov, Robert Šajn, Kristina Petrovska, 2023, izvirni znanstveni članek Povzetek: In this work, the contents and spatial distributions of 19 elements (Ag, Al, B, Ba, Ca, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni, P, Pb, Sr, V, Zn) in the soil of the western part of North Macedonia (Mavrovo-Rostuše region) are presented. For this purpose, a total of 66 soil samples were collected from 33 locations (33 samples of topsoil, 0-5 cm, and 33 samples of subsoil, 20-30 cm). All samples were analysed by inductively coupled plasma - atomic emission spectrometry (ICP-AES) after complete digestion with four acids (HNO3, HF, HClO4 and HCl). The obtained results were statistically evaluated and spatial distribution maps for all analysed elements were also prepared. Factor analysis was performed to reduce the number of data used and new synthetic variables (factors) were identified. Through the application of factor analysis, three geochemical associations were identified: Factor 1 (Zn, K, Cu, Fe, and Li), Factor 2 (Cr, Ni, and Mg) and Factor 3 (Ca and Al). From the obtained data and the maps of spatial distribution, it could be concluded that the distribution of the analysed elements is related to the lithology of the region. Thus, it was found that the higher content of elements of Factor 1 occurs in the eastern and southern part of the study area (middle and lower reaches of the Radika River and along the Mala River), where Mesozoic and Paleozoic carbonates as well as Paleozoic shales and Paleogene flysch prevail. Factor 2 (Cr, Ni and Mg) also represents a lithogenic association. The highest contents of the elements in both soil layers were found in the areas where Paleozoic sandstones and shales (village of Lazaropole and the area around the Mavrovo Lake) and Paleogene flysch (Rostuše village) predominate. Factor 3 (Ca and Al) also represents lithogenic association of elements. The highest content of these elements was found in the northwestern part of the study area (village of Žirovnica and along the Berička River) and in the northeastern region above the village of Brodec where Mesozoic carbonates and Paleogene flysch dominate.
Ključne besede: soil, heavy metals, spatial distribution, Mavrovo-Rostuše region, North Macedonia
Objavljeno v DiRROS: 04.01.2024; Ogledov: 336; Prenosov: 75
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1475. Application of multivariate statistical methods for determining geochemical trends of elements on the territory of SloveniaRobert Šajn, Mateja Gosar, Jasminka Alijagić, Tamara Teršič, 2024, izvirni znanstveni članek Povzetek: The main objective of this study is to map multi-element geochemical anomalies in soil on a regional scale. We aimed to determine and evaluate the baseline geochemical values and main geochemical trends in soil that may serve as reference values against any future changes. A total of 817 topsoil samples (0–10 cm) were collected in a 5 × 5 km grid and analyzed for 35 elements using ICP-ES after multi-acid digestions (HClO4/HNO3/HCl/HF) and 53 elements using ICP-MS after modified aqua regia digestion (HCl/HNO3/H2O). The analytical results for the two different digestion methods (multi-acid digestion vs. aqua regia) were also compared for each chemical element. Multivariate statistical methods were applied to identify the geochemical trends and main sources of trace elements over the territory of Slovenia. Based on these results, seven natural and one mixed natural/anthropogenic geochemical association were established. The contents and trends of the determined factors are presented according to 8 natural units, 4 drainage areas, and geological units characteristic of Slovenia. The identified anthropogenic geochemical association combines toxic elements (Ag, Bi, Cd, Hg, P, Pb, S, Sn, and Zn). Increased values of these elements can be found in mining areas and metallurgic centers, in Quaternary sediments of the Sava River, and Adriatic Basin as the consequence of past mining activities and in the Julian Alps, where their origin could be connected to the atmospheric deposition.
Ključne besede: soil, geochemical mapping, distribution of geochemical elements, factor analysis, cluster analysis
Objavljeno v DiRROS: 04.01.2024; Ogledov: 313; Prenosov: 74
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1476. Heavy minerals as indicators of source material in soils on carbonatesBarbara Čeplak, Miloš Miler, Nina Zupančič, Simona Jarc, 2023, izvirni znanstveni članek Povzetek: The origin of the soils formed on carbonate rocks remains uncertain, as they are probably of polygenetic origin. Of particular interest are the elevated contents of some trace elements detected in these soils, as they can hardly be attributed to insoluble residues of carbonate rock. The aim of this study was to uncover the relationship between heavy minerals in bedrock and soil and to identify other sources that influence the mineral and chemical composition of soil. We investigated representative samples of soils and dolomite bedrock as well as sandstones and marlstones from the nearby flysch basin as an expected source of the aeolian contribution. XRD and SEM/EDS showed that mineral diversity is higher in soils compared to the dolomites. Heavy minerals found in dolomite insoluble residue include sphalerite, Ti-oxide (probably rutile), zircon, fluorite, pyrite, minerals of REE phosphates and apatite group, interpreted as terrigenous detrital material. The mineral composition of soil heavy fraction is only partly following insoluble residues of bedrock and indicates possible aeolian contribution. Comparison with nearby flysch sandstones and marlstones showed similarities in mineralogical diversity by the presence of chromite and Fe-Cr(Mn) oxides (probably carmichaelite). Other minerals present in soils and flysch layers, such as Ti-oxide (probably rutile), zircon, REE phosphates, and pyrite grains, however, show similarities in mode of occurrence and transport indications. Signs of aeolian transport on the grains detected in soils were further confirmed by SEM/EDS.
Ključne besede: Phaeozem, Upper Triassic dolomite, flysch layers, trace elements, SEM/EDS
Objavljeno v DiRROS: 04.01.2024; Ogledov: 331; Prenosov: 67
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1477. Initial experiences of the first version of Slovene sustainable building Indicators that are based on Level(s)Sabina Jordan, Miha Tomšič, Friderik Knez, Marjana Šijanec-Zavrl, 2023, izvirni znanstveni članek Povzetek: To determine the possibilities for the implementation of sustainable building indicators in Slovenia, testing of the first version of the indicators, developed in the CARE4CLIMATE project and based on the EU Level(s) framework, was carried out in 2022. Invited and interested stakeholders of the construction process were provided with video content and instructions on the Slovenian e-platform of sustainable building indicators. In addition, workshops and lectures with individual subjects were also performed. The final phase of the training and testing procedure included a questionnaire, which was used to obtain information about the participants' opinions regarding the indicators. The analysis of the results of the testing, which was focused on level 2, confirmed the key preliminary finding of the development group, namely that currently, due to the lack of certain knowledge, data, and tools, all indicators for this level are not yet feasible in practice. The research also highlighted the greater need for training and specialization of experts in this field. At the same time, it showed that the testing of the first version itself was a big challenge: only 30 experts fully participated and filled out the online questionnaire. This number seems alarmingly low at first glance, but compared to level(s) testing in the EU member states, it is much more than 50 times higher. However, for the further execution of the indicators in Slovenia, it will therefore be necessary to invest a lot of effort and engagement. It is likely that state support will also be needed, for example, in the form of financial mechanisms or incentives and/or legislative background.
Ključne besede: sustainability, building, indicators, implementation, testing, questionnaire
Objavljeno v DiRROS: 04.01.2024; Ogledov: 330; Prenosov: 119
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1478. Vrednotenje vplivov DPN za VE Paški Kozjak na stanje gozda in gozdarstvaAndreja Ferreira, 2023, elaborat, predštudija, študija Ključne besede: vrednotenje, vplivi, državni prostorski načrt, vetrna elektrarna, gozdovi, gozdarstvo, Paški Kozjak
Objavljeno v DiRROS: 03.01.2024; Ogledov: 371; Prenosov: 0 |
1479. Fertilisation with potato starch wastewater effect on the growth of Scots pine (Pinus sylvestris L.) forest in PolandNella Waszak, Filipe Campelo, Iain Robertson, Radosław Puchałka, Fatima-Zahraa El Balghiti, Jožica Gričar, Ali Boularbah, M. Koprowski, 2024, izvirni znanstveni članek Povzetek: Fertilisation is often used to increase plant productivity in agriculture but has also been used in forestry. In our study, Scots pine forest growing in a nitrogen-poor environment was fertilised with NPK post-production wastewater from a potato starch factory. Our research aimed to investigate the dependence of tree growth on different NPK concentrations. Cell characteristics such as cell wall thickness (CWT), lumen diameter (LD) and tree-ring features such as ring width (RW), total number of cells in annual growth (nTotal), earlywood (EW) and latewood (LW) were investigated. Twenty-six years of regular fertilisation of the forest with different doses of wastewater rich in NPK elements have affected the anatomical structure of Scots pine trees. It is presumed that the reduction in CWT and LD on the fertilised site was due to deficiencies in plant water conductivity, which may have occurred due to physiological drought. The influence of nitrogen on unfertilised site from the wastewater area could contribute to the CWT thickening. The results confirm that the use of NPK in excessive doses is detrimental to trees' conductive system.
Ključne besede: wastewater effluents, forest fertilisation, cell measurements, tree-ring width, wood anatomy
Objavljeno v DiRROS: 03.01.2024; Ogledov: 324; Prenosov: 175
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1480. Fibre reinforced alkali-activated rock woolMajda Pavlin, Barbara Horvat, Vilma Ducman, 2022, objavljeni znanstveni prispevek na konferenci Povzetek: Mineral wool, i.e. rock and glass wool, represents considerable challenge after its functional-time runs out due to its small density leading to large volume consumption during transport and in landfills where it usually ends. Because rock wool is mineralogically and chemically a promising precursor material for alkali-activation, it was milled from few centimetres-decimeters long fibres to micron-sized fibres. Since fibres in alkali-activated materials generally show an increase in mechanical strength, especially the bending strength, 1 m% of additional fibres (basalt, cellulose (2 types), glass, polypropylene, polyvinyl alcohol and steel fibres) was used in the alkali mixture, that was curred at 40 °C for 3 days. Time dependence of the mechanical strengths of alkali- activated materials with and without additional fibres was followed. Maximal increase of compressive and bending strength after 28 days was reached with polypropylene fibres, i.e. it was 20% and 30% higher than compressive and bending strength of alkali- activated material without additional fibres respectively.
Ključne besede: secondary raw material, alkali activated material, foaming, homogenization, mechanical strength
Objavljeno v DiRROS: 21.12.2023; Ogledov: 327; Prenosov: 112
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