1. Evaluation of two-phase sample transport upon ablation of gelatin as a proxy for soft biological matrices using nanosecond laser ablation – inductively coupled plasma – mass spectrometryTom Van Helden, Kristina Mervič, Ivan Nemet, Johannes Teun van Elteren, Frank Vanhaecke, Sanda Rončević, Martin Šala, Thibaut Van Acker, 2024, izvirni znanstveni članek Objavljeno v DiRROS: 27.02.2024; Ogledov: 122; Prenosov: 58
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4. Differences in ratio of carbon stable Isotopes among barley grain milling fractions with various concentrations of beta-glucansTom Levanič, Blaž Cigić, Mateja Germ, Ivana Polišenská, Kateřina Vaculová, Igor Pravst, Darja Kocjan Ačko, Ivan Kreft, 2023, izvirni znanstveni članek Povzetek: The grains of three barley varieties were milled and sieved to obtain respective milling fractions with a content of beta-glucans (b-G) from 1.4 to 10.7%. The enriched fraction obtained by the extraction and precipitation contained 24.7% of b-G. The differences between the ratio of stable C carbon isotopes were established. Milling fractions with coarse particles had more beta-glucans and a more negative ratio of δ 13C isotope in comparison to the respective intact barley grain. However, the enriched fraction had a less negative isotope ratio. So, it is not expected that the deviation from the stable isotope ratio of grain in milling fractions is the result of the content of b-G, but it depends on other barley grain constituents. In different parts of barley grain, there are substances with different stable isotope ratios, and by milling and sieving, they are assorted to the same milling fraction with most of the b-G. The method for determining the ratio of a stable carbon isotope in diverse barley grain fractions, applied in this investigation, is potentially opening the possibility for an additional method of screening the concentration of bioactive constituents in barley grain.
Ključne besede: beta-glucans, starch, barley, stable isotopes, nutrition, milling
Objavljeno v DiRROS: 02.08.2023; Ogledov: 354; Prenosov: 172
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5. Radial increment of beech (Fagus sylvatica L.) Is under a strong impact of climate in the continental biogeographical region of CroatiaTom Levanič, Damir Ugarković, Ivan Seletković, Mladen Ognjenović, Mia Marušić, Robert Bogdanić, Nenad Potočić, 2023, izvirni znanstveni članek Povzetek: European beech (Fagus sylvatica L.) is an important component of forests in the alpine and continental biogeographical regions of Croatia. This study aimed to (1) analyze the long-term response of beech to climate, (2) identify potentially critical climatic conditions that could negatively affect the radial increment (RI) and vitality of beech, and (3) evaluate differences in the response of beech between the two biogeographical regions in Croatia. We used the 16 × 16 km Croatian ICP Forests Level 1 network. On a total of 25 plots, we cored between 5 and 24 trees for dendrochronological analysis. Tree-ring widths (TRW) were measured and standardized using cubic spline. TRW chronologies for the two regions were calculated and correlated to the temperature and precipitation data and Standardized Precipitation and Evapotranspiration Index (SPEI) using bootstrapped correlations. Continental region precipitation from April to August and alpine region precipitation from June to August were significantly important for RI. Temperature was less important for RI than precipitation in both regions, but the importance of the negative impact of above-average temperatures in the continental region and the positive impact of above-average precipitation in the alpine region has increased over the last two decades. A comparison with the 3-month SPEI confirmed the significant influence of high temperatures and the lack of precipitation in August on the RI of beech trees in both regions.
Ključne besede: climate change, tree growth, forest productivity, drought, European beech
Objavljeno v DiRROS: 28.06.2023; Ogledov: 412; Prenosov: 207
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6. Growth response of European beech (Fagus sylvatica L.) and Silver Fir (Abies alba Mill.) to climate factors along the Carpathian massivePia Caroline Adamič, Tom Levanič, Mihail Hanzu, Matjaž Čater, 2023, izvirni znanstveni članek Povzetek: European forests are becoming increasingly threatened by climate change and more frequent droughts. The likely responses of species to climate change will vary, affecting their competitiveness, their existence, and consequently, forest management decisions and measures. We determined the influence of climate on the radial growth of European beech and silver fir along the Carpathians to find similarities between the two species and the main differences. Along the Carpathian Mountains, seven sites with mature fir–beech stands above 800 m above sea level were selected and analyzed. Our study confirmed different responses depending on species and location. A more pronounced response of tree growth to climate was observed on the eastern side of the Carpathians, while it was less expressed or even absent on the southern sites. Both beech and fir show better radial growth with higher precipitation in July and slower growth with higher average and maximum temperatures in June of the current year. Fir demonstrates a positive correlation between radial growth and temperature in winter, while beech demonstrates a negative correlation between radial growth and temperature in summer. In the 1951–1960 decade, the average tree ring widths in fir and beech were largest at the southern sites compared to the other sites, but since 2011, the southern sites have had the lowest increase while northern sites have had the largest. Both species respond differently to climate and are likely to follow different competitive paths in the future.
Ključne besede: climate change, dendrochronology, radial growth response, meteorological parameters
Objavljeno v DiRROS: 28.06.2023; Ogledov: 436; Prenosov: 280
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7. Stable isotope composition in tree rings of Fagus sylvatica L. saplings reflects environmental variation induced by silviculture and microsite factorsJanez Kermavnar, Tom Levanič, Lado Kutnar, 2023, izvirni znanstveni članek Povzetek: Natural regeneration of tree species is sensitive to silvicultural interventions. This study aimed to investigate the effects of different cutting intensities and local topographic and soil conditions on the composition of stable carbon (δ13C) and oxygen (δ18O) isotopes in wood of young beech (Fagus sylvatica L.) trees. Beech saplings in the regeneration layer were sampled in summer 2018 at three study sites in Dinaric fir-beech forests in the karst area of Slovenia. Three different cutting intensities were performed in 2012: i) no cutting (control), ii) 50% cutting of the stand’s growing stock creating thinned stands, and iii) 100% cutting of the stand’s growing stock creating 0.4 ha canopy gaps. We show that δ13C increased along the gradient of cutting intensity. On average, δ13C values in the tree rings were ∼ 2‰ increased in trees from canopy gaps than from closed control stands. Furthermore, δ13C was higher on south-facing slopes characterized by higher air temperatures and lower relative humidity compared to north-facing slopes of karst sinkholes. Additionally, the results suggest a dependence of δ18O on interannual and cross-site climatic variations, particularly in the case of summer precipitation amount. δ18O also responded to soil depth, with beech individuals exhibiting lower values on deeper soils, presumably characterized by higher soil water availability compared to shallow soils. The results are discussed in the context of future climate change, as many beech-dominated forests on karst terrain in the Dinaric Mountains are particularly affected by climate warming and drying due to prolonged and reoccurring summer droughts, intensified large-scale disturbances, and often shallow soils with low water storage capacity.
Ključne besede: stable carbon isotopes, stable oxygen isotopes, tree cutting, microclimate, drought stress, dinaric fir-beech forests
Objavljeno v DiRROS: 05.04.2023; Ogledov: 831; Prenosov: 242
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8. Podlaga za izdelavo usmeritev pri gospodarjenju z navadno smreko v SlovenijiLuka Krajnc, Mitja Skudnik, Tom Levanič, Matjaž Čater, Aleksander Marinšek, Janez Zafran, 2022, izvirni znanstveni članek Povzetek: V prispevku predstavimo podlago za izdelavo usmeritev pri gospodarjenju z navadno smreko v Sloveniji. Izvedli smo več ločenih analiz z istim ciljem: pripraviti strokovno utemeljene in s podatki podprte usmeritve za gospodarjenje z navadno smreko v Sloveniji v prihodnjih desetletjih. Tako smo v tem prispevku združili rezultate meritev nacionalne gozdne inventure, analizo priraščanja smreke, analize vrstne pestrosti ter pregled osnutkov načrtov za gozdnogospodarska območja. Namen tega prispevka je predstavitev rezultatov štirih ločenih sklopov analiz podatkov, ki so predstavljali osnovo za izdelavo usmeritev pri gospodarjenju z navadno smreko, objavljenih v naslednjem prispevku.
Ključne besede: navadna smreka, podnebne spremembe, gospodarjenje
Objavljeno v DiRROS: 20.02.2023; Ogledov: 530; Prenosov: 171
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9. A glimpse of the lost Upper Triassic to Middle Jurassic architecture of the Dinaric Carbonate Platform margin and slopeBoštjan Rožič, Luka Gale, Primož Oprčkal, Astrid Švara, Tomislav Popit, Lara Kunst, Dragica Turnšek, Tea Kolar-Jurkovšek, Andrej Šmuc, Aljaž Iveković, Jan Udovč, David Gerčar, 2022, izvirni znanstveni članek Povzetek: In the southernmost outcrops of the Slovenian Basin the Middle Jurassic coarse-grained limestone breccia (mega)beds are interstratified within a succession that is otherwise dominated by hemipelagites and distal turbidites. In this paper, these beds are described as the Ponikve Breccia Member of the Tolmin Formation. We provide descriptions of the studied sections with detailed geological maps and analysis of the breccia lithoclasts. From the latter, a non-outcropping margin of the Dinaric Carbonate Platform is reconstructed. In the Late Triassic the platform margin was characterized by a Dachstein-type marginal reef. After the end-Triassic extinction event, the platform architecture remained, but the reefs were replaced by sand shoals characterized by ooids. In the late Early Jurassic and/or early Middle Jurassic a slope area might have been dissected by normal faults and a step-like paleotopography was formed. In the Bajocian, during a period of major regional geodynamic perturbations, extensional or transtensional tectonic activity intensified and triggered the large-scale collapses of the Dinaric Carbonate Platform margin producing the limestone breccias described herein. This may in turn have caused a backstepping of the platform margin, as is evident from the occurrence of Late Jurassic marginal reefs that are installed directly above the Upper Triassic and Lower Jurassic inner platform successions.
Ključne besede: Slovenian Basin, Dinaric Carbonate Platform, Middle Jurassic, limestone breccia, debris-flow, stratigraphy, Ponikve breccia
Objavljeno v DiRROS: 18.01.2023; Ogledov: 488; Prenosov: 395
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10. Pridobivanje podatkov o spremembah zalog ogljika v živi in odmrli biomasi v gozdovih : vmesno poročilo (Mejnik 3) za: Javno naročilo: 430-204/2021/19Mitja Skudnik, Polona Hafner, Andrej Grah, Jernej Jevšenak, Gal Kušar, Luka Krajnc, Tom Levanič, Boštjan Mali, Anže Martin Pintar, Janez Zafran, 2022, elaborat, predštudija, študija Ključne besede: odmrla lesna biomasa, temeljnica, površina gozda, lesna zaloga, vzorčne ploskve, starost gozdov, kakovost stoječih dreves
Objavljeno v DiRROS: 17.01.2023; Ogledov: 525; Prenosov: 0 |
