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Na voljo sta dva načina iskanja: enostavno in napredno. Enostavno iskanje lahko zajema niz več besed iz naslova, povzetka, ključnih besed, celotnega besedila in avtorja, zaenkrat pa ne omogoča uporabe operatorjev iskanja. Napredno iskanje omogoča omejevanje števila rezultatov iskanja z vnosom iskalnih pojmov različnih kategorij v iskalna okna in uporabo logičnih operatorjev (IN, ALI ter IN NE). V rezultatih iskanja se izpišejo krajši zapisi podatkov o gradivu, ki vsebujejo različne povezave, ki omogočajo vpogled v podroben opis gradiva (povezava iz naslova) ali sprožijo novo iskanje (po avtorjih ali ključnih besedah).

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Xylogenesis reveals the genesis and ecological signal of IADFs in Pinus pinea L. and Arbutus unedo L.
Angela Balzano, Katarina Čufar, Giovanna Battipaglia, Maks Merela, Peter Prislan, Giovanna Aronne, Veronica De Micco, 2018

Povzetek: Background and Aims: Mediterranean trees have patterns of cambial activity with one or more pauses per year, leading to intra-annual density fluctuations (IADFs) in tree rings. We analysed xylogenesis (January 2015 - January 2016) in Pinus pinea L. and Arbutus unedo L., co-occurring at a site on Mt. Vesuvius (southern Italy), to identify the cambial productivity and timing of IADF formation. Methods: Dendrochronological methods and quantitative wood anatomy were applied and enabled IADF identification and classification. Key Results: We showed that cambium in P. pinea was productive throughout the calendar year. From January to March 2015, post-cambial (enlarging) earlywood-like tracheids were observed, which were similar to transition tracheids. The beginning of the tree ring was therefore not marked by a sharp boundary between latewood of the previous year and the new xylem produced. True earlywood tracheids were formed in April. L-IADFs were formed in autumn, with earlywood-like cells in latewood. In A. unedo, a double pause in cell production was observed, in summer and winter, leading to L-IADFs in autumn as well. Moreover, the formation of more than one IADF was observed in A. unedo.
Ključne besede: kambijeva aktivnost, funkcionalni znaki v lesu, gostotne variacije v branikah, Pinus pinea L., Arbutus unedo L., ksilogeneza, branike, cambial activity, functional wood traits, intra-annual density fluctuations, xylogenesis, tree rings
DiRROS - Objavljeno: 20.02.2020; Ogledov: 160; Prenosov: 113
URL Celotno besedilo (0,00 KB)

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Vrednotenje bibliografske storitve z vidika raziskovalne dejavnosti : pomen in vpliv vodenja bibliografije raziskovalcev za knjižničarje v slovenskih raziskovalnih knjižnicah
Maja Peteh, Primož Južnič, 2018

Povzetek: Namen: Svetovanje uporabnikom pridobiva vedno večji pomen v celotnem obsegu knjižničnih storitev. Svetovanje raziskovalcem od knjižničarja zahteva poglobljena bibliometrijska znanja, predvsem v visokošolskih in specialnih knjižnicah. Knjižničar bibliograf v slovenskem prostoru vnaša bibliografske zapise v sistem COBISS in ima s tem vpogled v objave raziskovalcev svoje institucije. V prvem delu prispevka so raziskana znanja, ki jih knjižničarji bibliografi pridobijo z vodenjem bibliografij raziskovalcev, in njihov vpliv na vzajemni odnos bibliotekar - raziskovalec. Drugi del raziskave obravnava vprašanje, koliko časa potrebujejo za katalogizacijo posameznih bibliografskih enot. Metodologija/pristop: Rezultati raziskave so kombinacija uporabe metode spletnega vprašalnika za visokošolske in specialne knjižničarje o njihovem delu (n = 113) in zabeležk 10 knjižničarjev bibliografov o času, potrebnem za izdelavo bibliografskega zapisa za potrebe bibliografij (n = 401 zapis). Rezultati: Za večino knjižničarjev bibliografov vodenje bibliografij ni primarna delovna obveznost. Za kakovostno opravljanje tega dela so nujna različna znanja in raznovrstni načini pridobivanja dodatnih informacij in mnenj, ki jih knjižničarji bibliografi dobijo v pravilnikih in pri kolegih. Zaradi narave bibliografskega dela spoznavajo raziskovalna področja ustanove in raziskovalcev z druge perspektive in razvijajo osebni stik z raziskovalci. V prispevku je prikazan povprečen čas izdelave bibliografskega zapisa glede na vrsto gradiva. Omejitve raziskave: Zaradi posebnosti slovenskega knjižničnega sistema, ki povezuje vzajemni katalog in informacijski sistem o raziskovalni dejavnosti (SICRIS), so rezultati uporabni le v slovenskem kontekstu. Analiza vrednotenja bibliografske storitve je nakazala, da bi bilo treba opraviti še intervjuje s knjižničarji bibliografi in raziskovalci, ki bi lahko pomembno dopolnili rezultate raziskave. Izvirnost/uporabnost raziskave: Knjižničarji bibliografi s svojim delom pridobijo vpogled v objave raziskovalcev institucije. Raziskava poudarja pomen spoznanj (predvsem vpogled v produkcijo raziskovalcev), ki jih knjižničar bibliograf pridobi z vodenjem bibliografij in jih lahko kakovostno uporabi pri svetovanju raziskovalcem na drugih področjih. Raziskava kaže na potrebo po zavestnem sodelovanju knjižničarjev bibliografov in raziskovalcev. Knjižničar bibliograf je zakladnica informacij za raziskovalce lastne ustanove in področja delovanja ustanove. Morebitna zunanja izvedba te storitve (t. i. outsourcing) bi pomenila manj kakovostno knjižnično informacijsko storitev.
Ključne besede: visokošolske knjižnice, specialne knjižnice, bibliografske storitve, katalogizacija, bibliografije raziskovalcev, bibliografi
DiRROS - Objavljeno: 20.02.2020; Ogledov: 140; Prenosov: 60
URL Celotno besedilo (0,00 KB)

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Urban forest research in the Mediterranean : a systematic review
Silvija Krajter Ostoić, Fabio Salbitano, Simone Borelli, Andrej Verlič, 2018

Povzetek: The Mediterranean region is facing many challenges, some of which can be addressed by nature-based solutions such as urban forests and green space. However, at best, urban forest research from Mediterranean countries has been only briefly addressed in review papers up to date. This Scopus-based review paper provides first insights into the development of urban forest research in the Mediterranean in the 20-year period from 1996 to 2015. The purpose of the review was to a) analyse distribution of urban forest research in the Mediterranean and identify countries that are forerunners based on the number of publications, b) to analyse distribution of research themes across the Mediterranean and per country, and hence point to research gaps and needs. Researchers from Italy, Turkey and Spain were the most productive in the analysed period. Research is mainly concentrated in the North, while it is scarce to non-existent in South and Eastern Mediterranean countries (excluding Turkey and Greece). Papers dealing with pollution, human health and sociocultural values were the most frequent. Some countries exhibited research specialisation with regard to certain themes. For instance Italian researchers mostly focused on topics related to pollution and urban forest management, the majority of Spanish papers addressed urban forests in the context of human health, while sociocultural values were the main research theme for researchers from Turkey. Papers were analysed also based on research methods, approaches and study locations. Suggested future research includes analysis of the quality of knowledge related to urban forests in the Mediterranean as well as of collaboration between researchers, research institutions and countries.
Ključne besede: research themes, Scopus, urban forestry, green space, green infrastructure, Mediterranean
DiRROS - Objavljeno: 20.02.2020; Ogledov: 153; Prenosov: 74
URL Celotno besedilo (0,00 KB)

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Tuber brennemanii and Tuber floridanum : two new Tuber species are among the most commonly detected ectomycorrhizal taxa within commercial pecan (Carya illinoinensis) orchards
Arthur C. Grupe II, Marcelo Aloisio Sulzbacher, Tine Grebenc, Rosanne Healy, Gregory Bonito, Matthew E. Smith, 2018

Povzetek: Truffles are sequestrate hypogeous fungi, and most form ectomycorrhizal (ECM) associations with trees. Truffles belonging to the genus Tuber (Pezizales, Ascomycota), %true truffles,% associate with diverse plant hosts, including economically important species such as pecan (Carya illinoinensis). Morphological and phylogenetic studies delimited several major lineages of Tuber, which include many cryptic and undescribed species. One of these, the Maculatum clade, is a speciose group characterized by relatively small, light-colored ascomata that have alveolate-reticulate spores. Here, we describe two new species in the Maculatum clade, Tuber brennemanii and T. floridanum (previously identified as Tuber sp. 36 and Tuber sp. 47). We delineate these two species by phylogenetic analyses of nuc ITS1-5.8S-ITS2 (= ITS) and partial 28S rDNA (= LSU), and through morphological analysis. A recent collection of T. floridanum from a pecan orchard in Brazil indicates that this species was introduced there on the roots of pecan seedlings. Systematic studies of ascomata and ECM fungal communities indicate that these species are geographically widespread and common ECM symbionts of pecans and other members of the Fagales, particularly in sites with disturbed soils and nutrient enrichment.
Ključne besede: biodiversity, mikologija, introduced species, Tuberaceae, truffles
DiRROS - Objavljeno: 20.02.2020; Ogledov: 134; Prenosov: 77
URL Celotno besedilo (0,00 KB)

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Tree differences in primary and secondary growth drive convergent scaling in leaf area to sapwood area across Europe
Giai Petit, Georg von Arx, Natasa Kiorapostolou, Silvia Lechthaler, Angela Luisa Prendin, Tommaso Anfodillo, Maria C. Caldeira, Jožica Gričar, Martina Lavrič, 2018

Povzetek: Trees scale leaf (AL) and xylem (AX) areas to couple leaf transpiration and carbon gain with xylem water transport. Some species are known to acclimate in AL : AX balance in response to climate conditions, but whether trees of different species acclimate in AL : AX in similar ways over their entire (continental) distributions is unknown. We analyzed the species and climate effects on the scaling of AL vs AX in branches of conifers (Pinus sylvestris, Picea abies) and broadleaved (Betula pendula, Populus tremula) sampled across a continental wide transect in Europe. Along the branch axis, AL and AX change in equal proportion (isometric scaling: b % 1) as for trees. Branches of similar length converged in the scaling of AL vs AX with an exponent of b = 0.58 across European climates irrespective of species. Branches of slow%growing trees from Northern and Southern regions preferentially allocated into new leaf rather than xylem area, with older xylem rings contributing to maintaining total xylem conductivity. In conclusion, trees in contrasting climates adjust their functional balance between water transport and leaf transpiration by maintaining biomass allocation to leaves, and adjusting their growth rate and xylem production to maintain xylem conductance.
Ključne besede: allocation, climate change, functional balance, leaf area, plantarchitecture, xylem
DiRROS - Objavljeno: 20.02.2020; Ogledov: 139; Prenosov: 60
URL Celotno besedilo (0,00 KB)

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Towards understanding the role of ectomycorrhizal fungi in forest phosphorus cycling : a modelling approach
Michiel F. Bortier, Enrique Andivia, José G. Genon, Tine Grebenc, Gabrielle I. Deckmyn, 2018

Povzetek: Many studies have shown the importance of ectomycorrhizal fungi (EM) in forests both for nutrient availability and for carbon (C) and nutrient cycling in the soil. Yet so far they are not incorporated in forest ecosystem growth and yield models. Recent research suggests phosphorus (P) shortage could be a major constraints to forest productivity in the future. For a realistic simulation of future forest ecosystem functioning, inclusion of detailed soil P cycling and the trees-EM interaction is necessary. We developed a full ecosystem P model that simulates P uptake by roots and EM, allocation within trees, physiological deficiency effects on C assimilation and allocation, release through litter decomposition, coupled with water, C and nitrogen (N) fluxes accounted for in the mechanistic forest stand model ANAFORE. Our results confirm the importance of incorporating EM in forest ecosystem models and suggest that the lack of incorporation of P in models may result in an under- or overestimation of forest growth. This new model has the potential of being used to assess the response of trees and/or stands to nutrient availability under different climate and management scenarios. With the current parameterization it is functional as a scientific research tool to investigate hypotheses.
Ključne besede: nutrient cycling, mechanistic model, pine forest, ectomycorrhizal fungi, phosphorus
DiRROS - Objavljeno: 20.02.2020; Ogledov: 147; Prenosov: 81
URL Celotno besedilo (0,00 KB)

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Toward objective assessment of the conservation status of (the Natura 2000) forest habitat types : a comparison of a qualitative and a quantitative modeling approach
Marko Kovač, Petra Grošelj, 2018

Povzetek: To halt the loss of biodiversity in natural habitats, the EU passed the Habitats Directive and established the Natura 2000 network. The network captured forest habitats and habitat types, whose conservation status must be reported under Article 17 of the Directive. Hence, the harmonization of habitat assessment methods and reporting formats are a critical issue. So far, the EU Commission and Member States have managed to design and issue reporting guidelines. However, as many of these reports are largely based on expert opinions, they tend to be biased and incomparable. To make conservation status assessments and reporting more consistent, this study evaluated a set of indicators with two decision support models. The DEX model operated with linguistic statements derived from numerical values, while the fuzzy model utilized numeric input. Both models were tested with data from Slovenia's three largest forest habitat types (FHT), namely 9110 % Luzulo-Fagetum beech forests, 91K0 % Illyrian Fagus sylvatica forests (Aremonio-Fagion) and 91L0 % Illyrian oak-hornbeam forests (Erythronio-Carpinion), provided by the Forest and Forest Ecosystem Condition Survey. The DEX model produced uniform results and defined the conservation status of all three FHTs as least favorable. Conversely, the fuzzy model produced three different conservation status grades for the FHTs: a favorable conservation status for the 91K0 FHT, least favorable for the 9110 FHT and unfavorable for the 91L0 FHT. Its results were logical and in accord with the existing assessments. The study showed that both models could be used for the evaluation of FHT traits. However, because of its larger sensitivity, the fuzzy model allowed detecting subtle differences among the indicator values due to the use of continuous numerical data and more sophisticated mathematical procedures.
Ključne besede: biodiversity, decision-making models, dex, fuzzy logic, inference rules, forest habitats
DiRROS - Objavljeno: 20.02.2020; Ogledov: 137; Prenosov: 72
URL Celotno besedilo (0,00 KB)

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