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Iskalni niz: "vrsta gradiva" (1) AND "polno besedilo" AND "organizacija" (Gozdarski inštitut Slovenije) .

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1.
Evaluating short-term impacts of forest management and microsite conditions on understory vegetation in temperate fir-beech forests : floristic, ecological, and trait-based perspective
Janez Kermavnar, Aleksander Marinšek, Klemen Eler, Lado Kutnar, 2019

Povzetek: Forest understory vegetation is largely influenced by disturbances and given local abiotic conditions. Our research focuses on the early response of understory vegetation to various forest management intensities in Dinaric fir-beech forests in Slovenia: (i) control, (ii) 50% cut of stand growing stock, and (iii) 100% cut of stand growing stock. Apart from identifying overstory removal effects, we were interested in fine-scale variation of understory vegetation and environmental determinants of its species composition. Vegetation was sampled within 27 karst sinkholes, which represent a dominant landform in studied forests. Within each sinkhole, five sampling plots, varying in slope aspect (centre, north, east, south, west), were established (135 in total), where pre-treatment (in 2012) and post-treatment (in 2014) floristic surveys were conducted. The sampled understory species were characterized in terms of Ellenberg's indicator values (EIVs) and plant functional traits (plant height, seed mass, specific leaf area, leaf dry matter content). Diversity metrics (species richness, total cover, Shannon index) increased in plots where the silvicultural measures were applied. Tree species richness also increased in 100% cutting. A redundancy analysis revealed that species composition was related to environmental variables, which are directly influenced by management interventions (overstory canopy cover, microclimate maximum daily temperature, soil properties thickness of organic soil layer) as well as by topographic factors (slope inclination and surface rockiness). EIVs for light were significantly affected by treatment intensity, whereas soil-related EIVs (moisture, reaction, nutrients) depended more on the within-sinkhole position. Canopy gaps, compared with uncut control plots, hosted a higher number of colonizing species with a higher plant height and smaller seeds, while leaf traits did not show a clear response. We found a negative correlation between pre-treatment species (functional) richness and post-treatment shifts in floristic (functional) composition. Plots with higher richness exhibited smaller changes compared with species-poor communities. Incorporating different perspectives, the results of this study offer valuable insights into patterns of understory vegetation response to forest management in fir-beech forests.
Ključne besede: canopy gap, microsite environment, Ellenberg indicator values, plant functional traits, compositional resistance, karst topography, fir-beech forest
DiRROS - Objavljeno: 06.12.2019; Ogledov: 8; Prenosov: 2
URL Celotno besedilo (0,00 KB)
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2.
Škodljivi organizmi in škodljivi dejavniki na sadikah gozdnega drevja v obdobju 1997-2018
Peter Smolnikar, Nikica Ogris, Barbara Piškur, 2019

Povzetek: Škodljivi organizmi (ŠO) in abiotski škodljivi dejavniki (ŠD) na sadikah gozdnega drevja v gozdnih drevesnicah resno otežujejo vzgojo zdravih in kakovostnih sadik. Za preučitev pomembnejših in najpogosteje pojavljajočih se ŠO in ŠD smo analizirali letne zapisnike o zdravstvenih pregledih iz 18 gozdnih drevesnic v obdobju 1997-2018. Rezultati so pokazali, da so poškodbe v 68 % zabeleženih primerov posledica delovanja patogenih gliv, v 29 % primerih žuželk ter v 1,1 % abiotskih dejavnikov. Poškodbe so bile zabeležene na 45 različnih rodovih drevesnih in grmovnih vrst, in sicer največkrat na rodovih Quercus (24,1 %) in Pinus (17,5 %), najpogostejše poškodbe so bile na listih oziroma iglicah (64,0 %). Najpogosteje beležene bolezni so bile pepelovke (Erysiphe sp.), največ različnih ŠO in ŠD pa se je pojavljalo na borih (Pinus sp.). Poškodovanost sadik je bila običajno nizka (do 10 %), vendar je močno variirala med leti. Za pridelovanje kakovostnih in zdravih sadik je ključen celosten pristop pri varstvu in vzgoji sadik.
Ključne besede: škodljiv organizem, bolezen, poškodovanost, sadika, semenka, mlada rastlina, drevesnica, Slovenija
DiRROS - Objavljeno: 06.12.2019; Ogledov: 10; Prenosov: 2
.pdf Celotno besedilo (732,65 KB)

3.
Razvoj gozdnih sestojev na nekdanjih novinah v Koprivni
Janez Golob, Milan Golob, David Hladnik, 2019

Povzetek: Na raziskovalnih ploskvah, ki ležijo na nekdanjih novinah na območju katastrske občine Koprivna, smo v septembru leta 2017 opravili šesto zaporedno polno izmero. Gozdovi na raziskovalnih ploskvah so v zasebni lasti in na njih od vzpostavitve le-teh v letu 1960 niso gospodarili. V naravnem sukcesijskem razvoju, ki se je začel pred 70 oziroma 100 leti, je na ploskvah prevladala smreka, spreminjanje sestojnih gostot bi lahko primerjali z Reinekejevem pravilom (SDI) o gostoti sestojev in samoizločanju dreves. Na raziskovalnih ploskvah se lesna zaloga giblje od 566,4 m3/ha do 761,3 m3/ha, temeljnica pa od 48,7 m2/ha do 61,7 m2/ha. Opazili smo skokovito povečanje višinskih krivulj smreke in macesna v sestojih. V neredčenih sestojih prevladujejo drevesa z visokimi neugodnimi vrednostmi dimenzijskega razmerja h/d.
Ključne besede: novinarjenje, raziskovalne ploskve, gozdovi na opuščenih kmetijskih površinah, sukcesijski razvoj
DiRROS - Objavljeno: 29.11.2019; Ogledov: 45; Prenosov: 32
URL Celotno besedilo (0,00 KB)
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4.
Robinija (Robinia pseudoacacia L.) v Beli krajini : razširjenost, priraščanje, pomlajevanje in upravljanje
Blaž Bahor, Matija Klopčič, 2019

Povzetek: Raziskovali smo razširjenost, priraščanje in pomlajevanje robinije v Beli krajini. Uporabili smo podatke Zavoda za gozdove Slovenije, del podatkov o pomlajevanju smo dodatno posneli. S podatki o gozdnih sestojih smo izračunali delež robinije v lesni zalogi in izdelali karto razširjenosti robinije ter karto površin, pomlajenih z robinijo. Debelinski in volumenski prirastek robinij smo izračunali s pomočjo podatkov s stalnih vzorčnih ploskev ter ju primerjali s prirastki drugih drevesnih vrst. S terensko pridobljenimi podatki smo analizirali pomladek na naključno izbranih stalnih vzorčnih ploskvah. Ugotovili smo, da se robinija pojavlja na 6,6 % gozdne površine, obilneje ob gozdnih robovih zunaj strnjenih gozdnih kompleksov. Lesna zaloga robinije sestavlja 3,5 % celotne lesne zaloge gozdov. Debelinski in volumenski prirastek robinije je višji od prirastka večine drevesnih vrst, s katerimi se najpogosteje pojavlja v sestojih. V prihodnosti je pričakovati nadaljnje širjenje robinije, zato jo je treba ustrezno upoštevati pri gospodarjenju z gozdovi.
Ključne besede: robinija, razširjenost, priraščanje, pomlajevanje, Bela krajina
DiRROS - Objavljeno: 29.11.2019; Ogledov: 41; Prenosov: 12
URL Celotno besedilo (0,00 KB)
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5.
Vpliv suše na drobne korenine dreves in ektomikorizo v gozdnih ekosistemih
Tanja Mrak, Hojka Kraigher, 2019

Povzetek: Sušni stres sproži tako pri drobnih koreninah dreves kot pri ektomikoriznih glivah številne spremembe na različnih nivojih. Drevesa se branijo pred sušo z mehanizmi izogibanja in tolerance. Suša lahko vpliva na kolonizacijo z ektomikoriznimi glivami in na strukturo ektomikorizne združbe. Pomembno vlogo pri preživetju mladja ob suši imajo skupne micelijske mreže. Ob zmerni suši je kolonizacija z ektomikoriznimi glivami večja kot ob ekstremni suši, kar ima za drevo številne pozitivne učinke. V sušnih razmerah se pogosto še posebej poveča pogostnost ektomikorizne vrste Cenococcum geophilum Fr., ki omogoča, da drobne korenine ostanejo funkcionalne in takoj po končanem sušnem obdobju pričnejo z absorpcijo vode. V sušnih razmerah se poveča tvorba težko razgradljivih molekul v koreninah (lignin), prav tako pa se težko razgradljive molekule (melanin) tvorijo tudi pri ektomikorizni vrsti C. geophilum, kar prispeva h kopičenju težko razgradljivih organskih snovi v tleh.
Ključne besede: globalne spremembe, drobne korenine, mikorizne glive, prilagoditve, organska snov v tleh
DiRROS - Objavljeno: 29.11.2019; Ogledov: 44; Prenosov: 15
URL Celotno besedilo (0,00 KB)
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6.
Effects of disturbance on understory vegetation across Slovenian forest ecosystems
Lado Kutnar, Thomas Andrew Nagel, Janez Kermavnar, 2019

Povzetek: The herbaceous understory represents a key component of forest biodiversity across temperate forests of Europe. Here, we quantified changes in the diversity and composition of the forest understory layer in representative Slovenian forest ecosystems between 2004/05 and 2014/15. In total, 60 plots were placed across 10 different managed forest types, ranging from lowland deciduous and mid-altitude mesic mixed forests to mountain conifer forests. This network is part of an international network of sites launched within the ICP Forests Programme aimed to assess the condition of forests in Europe. To examine how disturbance influenced understory dynamics, we estimated the disturbance impacts considering both natural and/or anthropogenic disturbances that cause significant damage to trees and to ground-surface layers, including ground-vegetation layers and upper-soil layers. Species richness across 10 sites (gamma diversity) significantly decreased from 272 to 243 species during the study period, while mean species richness per site did not significantly change. The mean value of site level Shannon diversity indices and evenness significantly increased. The cover of most common plant species increased during the monitoring period. The mean value of disturbance estimates per site increased from 0.8% in 2004/05 (ranging from 0% to 2.5%) to 16.3% in 2014/15 (ranging from 5.0% to 38.8%), which corresponded to a reduction in total vegetation cover, including tree-layer cover. More disturbed sites showed larger temporal changes in species composition compared to less disturbed sites, suggesting that forest disturbances caused understory compositional shifts during the study period. Rather than observing an increase in plant diversity due to disturbance, our results suggest a short-term decrease in species number, likely driven by replacement of more specialized species with common species.
Ključne besede: vegetation dynamics, vascular-plant diversity, understory layer, disturbance, monitoring, temperate forests
DiRROS - Objavljeno: 27.11.2019; Ogledov: 57; Prenosov: 9
URL Celotno besedilo (0,00 KB)

7.
Beech and silver fir's response along the Balkan's latitudinal gradient
Tom Levanič, Matjaž Čater, 2019

Povzetek: At the 1000km geographical distance in Dinaric montane forests of silver fir (Abies alba Mill.) and European beech (Fagus sylvatica L.), the tree response from the north-western sites towards southern, warmer and dryer sites was performed during three consecutive growing seasons (2011, 2012 and 2013). On eleven permanent plots, positioned in uneven-aged beech and fir forests above 800m along the geographical gradient, the physiological and morphological response to light intensity were measured in predefined light categories based on the analysis of hemispherical photos. Radial growth was analysed on all plots and compared to precipitation, temperature and two drought indexes. Analysis showed a decrease in the cumulative precipitation and no change in temperature between plots. Beech was most efficient in the open area light conditions, while fir proved most efficient under shelter. Physiological response for beech increased towards SE and reached its maximal values in the middle of transect, while fir%s response decreased from the NW towards SE. Tendency to plagiotropic growth decreased from NW to SE in both species. Growth response to climatic parameters is weak, stronger in fir than in beech and decreasing towards SE.
Ključne besede: beech, uneven aged forests, silviculture, latitudinal gradient, response, silver fir
DiRROS - Objavljeno: 13.11.2019; Ogledov: 95; Prenosov: 20
URL Celotno besedilo (0,00 KB)
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8.
The conservation status assessment of Natura 2000 forest habitats in Europe : capabilities, potentials and challenges of national forest inventories data
Iciar Alberdi, Leónia Nunes, Marko Kovač, Ingrid Bonheme, Isabel Cañellas, Francisco Castro Rego, Susana Dias, Inês Duarte, Monica Notarangelo, Maria Rizzo, Patrizia Gasparini, 2019

Povzetek: Key message There is a need to improve the consistency of international information concerning the conservation status assessment of the species and habitat types in the Natura 2000 reports. National Forest Inventories could contribute towards a more objective and harmonised assessment although their use shows some challenges as low precision for rare or small area habitats. Recommendations for a set of 12 structural and functional indicators are provided. Context There are differences among Member States as regards applying conservation status assessment and priorities according to the Directive on the conservation of natural habitats (Habitats Directive). Aims This paper aims to analyse the consistency as regards forest habitat types reporting and the use and suitability of National Forest Inventories (NFIs) to assess their conservation status, as well as to provide recommendations for harmonised assessments through NFIs. Methods A survey was carried out concerning the use of NFI data to report within the commitments of the Habitat Directive. The survey covered 13 European countries, accounting for 62% of forest habitat area. Additionally, case studies were carried out in four countries. Results The identification of forest habitat types and the set of quantitative and/or qualitative indicators differ between countries. The use of NFI data is being considered in seven countries and it is expected to increase for the 2013%2018 reporting period. The main challenges reported of use of NFI data are related to the habitat identification and their mapping, and the monitoring frequency, design and costs (i.e. rare or small area habitats).
Ključne besede: forest biodiversity, function and structure indicators, international reporting, vegetation, reference value, thresholds, NFI, harmonination
DiRROS - Objavljeno: 17.10.2019; Ogledov: 74; Prenosov: 18
URL Celotno besedilo (0,00 KB)

9.
Towards a set of national forest inventory indicators to be used for assessing the conservation status of the Habitats Directive forest habitat types
Marko Kovač, Patrizia Gasparini, Monica Notarangelo, Maria Rizzo, Isabel Cañellas, Laura Fernández-de-Uña, Iciar Alberdi, 2019

Povzetek: Since the enactment of the EU Habitats Directive, the conservation status of forest habitat types, habitats of species, and species has become the central concept of the Directive's nature conservation legislation. Despite its role, it has drawn relatively little attention. Within a rather short research period, a few research papers have addressed the existing definitions, indicators for the conservation status assessment, and assessment techniques. This paper attempted to complete the set of measurable indicators available in national forest inventories and connect them with the forest habitat types% conservation status components (area, function, structure, and prospects). A set of 40 indicators was defined, labelled with one or more of the four conservation status components and assessed with the quality dimensions. The analysis uncovered that five indicators could be used to assess the component of range and area, 20 that of structure, 22 that of function and 27 that of prospects. It also showed that conventional forestry indicators such as tree species, diameter at breast height, and regeneration are less sensitive regarding the data quality. Conversely, some typical biodiversity indicators lacked completeness, timeliness, and precision. In addition to this analysis, the data distributions (data for them were provided by the national forest inventories of Italy, Slovenia, and Spain) of some indicators were analysed. Based on all the results, it was also possible to conclude that there is a shortage of national forest inventory indicators for the assessments of the area and function conservation status components. While the area component should be described with the indicators of forest habitat type fragmentation, mingling and perforation with non-forest and other forest vegetation communities, the functional component is bereft of indicators describing processes such as biomass growth and carbon cycling. Future research should thus search for more indicators to represent all conservation status components in a more balanced way. More efforts should also be expended into the harmonisation of indicators.
Ključne besede: European forests, forests, forest structure, forest function, prospect, quality dimensions
DiRROS - Objavljeno: 17.10.2019; Ogledov: 70; Prenosov: 40
URL Celotno besedilo (0,00 KB)

10.
Anatomske, kemijske in sorpcijske lastnosti beljave in jedrovine rdečega bora
Maks Merela, Vanja Turičnik, Viljem Vek, Primož Oven, 2019

Povzetek: V pričujoči študiji smo preučevali anatomske, kemijske in izbrane fizikalne lastnosti beljave in jedrovine rdečega bora (Pinus sylvestris L.) in tudi morebitni vpliv ekstraktivov na sorpcijske lastnosti borovine. Študija je bil opravljena na 6 testnih drevesih. Anatomske preiskave so bile narejene s klasično svetlo-poljsko mikroskopijo. Preiskovanje vzorcev za določanje dimenzijske stabilnosti in sorpcijskih lastnosti je potekalo po uravnovešanju v steklenih klima komorah. Vzorce za kemijsko analizo smo ekstrahirali s cikloheksanom ter z zmesjo acetona in vode, delež celokupnih fenolov pa smo kolorimetrično določili z UV-Vis spektrofotometrijo. Razlike med beljavo in jedrovino so se pokazale v smolnih kanalih, v lumnih aksialnih traheid ob trakovih ter v trakovnih parenhimskih celicah in v obokanih piknjah. Delež ekstraktivnih snovi v jedrovini je bil večji kot v beljavi. Preiskave beljave in jedrovine niso pokazale statistično značilnih razlik v gostoti v absolutno suhem stanju, pri točki nasičenja celičnih sten, diferencialnem nabrekanju v radialni smeri in ne pri koeficientu nabrekanja v tangencialni smeri. Izkazalo se je, da se prečna krčitvena anizotropija, diferencialni nabrek v tangencialni smeri, koeficient nabrekanja v radialni smeri ter sorpcijski kvocient razlikujejo pri beljavi in jedrovini rdečega bora. Omenjene razlike lahko pripišemo vzajemnemu učinku anatomskih in kemičnih značilnosti obeh kategorij lesa, vsekakor
Ključne besede: rdeči bor, Pinus sylvestris L., sorpcijske lastnosti, beljava, jedrovina, ekstraktivi, anatomija lesa
DiRROS - Objavljeno: 16.10.2019; Ogledov: 135; Prenosov: 80
URL Celotno besedilo (0,00 KB)
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