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1.
Assessing the heterogeneity and conservation status of the Natura 2000 priority forest habitat type Tilio–Acerion (9180*) based on field mapping
Janez Kermavnar, Erika Kozamernik, Lado Kutnar, 2023, izvirni znanstveni članek

Povzetek: Priority habitat types (HTs) within the Natura 2000 network are of the highest importance for conservation in Europe. However, they often occur in smaller areas and their conservation status is not well understood. One such HT is that of the Tilio–Acerion forests of slopes, screes and ravines (9180*). The Natura 2000 study site, Boč–Haloze–Donačka gora, in the Sub-Pannonian region of eastern Slovenia is characterized by a matrix of European beech forests and includes rather small, fragmented areas covered by Tilio–Acerion forests. The goal of this research was to examine the heterogeneity and conservation status of the selected HT through field mapping, which was performed in the summer of 2020. As the conservation of HT calls for a more detailed approach, we distinguished between the following four pre-defined habitat subtypes: (i) Acer pseudoplatanus-Ulmus glabra stands growing mostly in concave terrain, (ii) Fraxinus excelsior stands growing on slopes, (iii) Tilia sp. stands with thermophilous broadleaves occurring on ridges and slopes, (iv) Acer pseudoplatanus stands occurring on more acidic soils with an admixture of Castanea sativa. Field mapping information was complemented with the assessment of habitat subtype characteristics using remote sensing data. The results showed that habitat subtypes differed significantly in terms of area, tree species composition, forest stand characteristics, relief features and the various threats they experienced (e.g., fragmentation, tree mortality, ungulate browsing pressure). The differences between subtypes were also evident for LiDAR-derived environmental factors related to topography (i.e., terrain steepness and Topographic Position Index). This study provides a baseline for setting more realistic objectives for the conservation management of priority forest HTs. Due to the specificities of each individual habitat subtype, conservation activities should be targeted to the Natura 2000 habitat subtype level.
Ključne besede: forest habitat subtype, monitoring, biodiversity conservation, LiDAR, Slovenia, NATURA 2000
Objavljeno v DiRROS: 03.02.2023; Ogledov: 936; Prenosov: 241
.pdf Celotno besedilo (9,53 MB)
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2.
Retrieval of vertical mass concentration distributions
Longlong Wang, Samo Stanič, Klemen Bergant, William Eichinger, Griša Močnik, Luka Drinovec, Janja Vaupotič, Miloš Miler, Mateja Gosar, Asta Gregorič, 2019, izvirni znanstveni članek

Povzetek: Aerosol vertical profiles are valuable inputs for the evaluation of aerosol transport models, in order to improve the understanding of aerosol pollution ventilation processes which drive the dispersion of pollutants in mountainous regions. With the aim of providing high-accuracy vertical distributions of particle mass concentration for the study of aerosol dispersion in small-scale valleys, vertical profiles of aerosol mass concentration for aerosols from different sources (including Saharan dust and local biomass burning events) were investigated over the Vipava valley, Slovenia, a representative hot-spot for complex mixtures of different aerosol types of both anthropogenic and natural origin. The analysis was based on datasets taken between 1–30 April 2016. In-situ measurements of aerosol size, absorption, and mass concentration were combined with lidar remote sensing, where vertical profiles of aerosol concentration were retrieved. Aerosol samples were characterized by SEM-EDX, to obtain aerosol morphology and chemical composition. Two cases with expected dominant presence of different specific aerosol types (mineral dust and biomass-burning aerosols) show significantly different aerosol properties and distributions within the valley. In the mineral dust case, we observed a decrease of the elevated aerosol layer height and subsequent spreading of mineral dust within the valley, while in the biomass-burning case we observed the lifting of aerosols above the planetary boundary layer (PBL). All uncertainties of size and assumed optical properties, combined, amount to the total uncertainty of aerosol mass concentrations below 30% within the valley. We have also identified the most indicative in-situ parameters for identification of aerosol type.
Ključne besede: valley air pollution, aerosol vertical distributions, lidar remote sensing, in-situ measurements, aerosol identification
Objavljeno v DiRROS: 03.03.2022; Ogledov: 693; Prenosov: 267
URL Povezava na celotno besedilo

3.
Ocena zgradbe in stabilnosti gozdnega roba kot pripomoček za ovrednotenje klimatske in zaščitne funkcije primestnih gozdov
David Hladnik, Andrej Kobler, Janez Pirnat, 2020, izvirni znanstveni članek

Povzetek: V prispevku podajamo razširjen povzetek iz članka, objavljenega v reviji Forests z naslovom Evaluation of forest edge structure and stability in peri-urban forests (Hladnik in sod., 2020). Dodali smo predloge o prenovi varovalne, zaščitne in klimatske funkcije gozdov ter predloge ukrepov, ki izhajajo iz izsledkov raziskave gozdnih robov. Analizirali smo vertikalno zgradbo gozdnih robov in opozorili na pomen dimenzijskega razmerja dreves h/d na gozdnih robovih primestnih gozdnih zaplat ob Ljubljani, kjer ob pozidanih zemljiščih prevladujejo visoki in strmi gozdni robovi. Predstavili smo preprosto metodologijo, na podlagi katere je mogoče z metodami daljinskega zbiranja podatkov zasnovati monitoring primestnih gozdnih površin in gozdnih robov.
Ključne besede: funkcije gozdov, stabilnost gozdnega roba, gozdni rob, zgradba gozdnega roba, LiDAR, urbani gozdovi
Objavljeno v DiRROS: 09.06.2020; Ogledov: 2216; Prenosov: 733
.pdf Celotno besedilo (296,57 KB)

4.
Evaluation of forest edge structure and stability in peri-urban forests
David Hladnik, Andrej Kobler, Janez Pirnat, 2020, izvirni znanstveni članek

Povzetek: In the presented research, we studied the forest edge structure of urban and peri-urban forests on the outskirts of Ljubljana (Slovenia) consisting of a number of patches covering the collective surface of 1884 ha. They differ from each other according to the degree of fragmentation and by the share of the interior forest area. On the basis of LiDAR data, we conducted an analysis of the edges of the persistent forest patches and estimated them with regard to the land use they bordered on. The horizontal estimation of forest edges and the changes of forest edges, in the last decades, were estimated using digital orthophoto images of cyclic aerial surveys of Slovenia, from 1975 to 2018. The data, provided by LiDAR, were used to obtain an accurate estimate of forest edges and the metrics of their vertical canopy structure. On the basis of the canopy height model (CHM), we determined the height classes, the heights of the tallest trees, and indices of canopy height diversity (CHD) as variables subjected to a k-means cluster analysis. To determine the forest edge and trees stability, their heights and diameters at breast height (DBH) were measured and their canopy length and h/d (height/diameter) dimension ratios were estimated. In the study area of the Golovec forest patch, more than half of the forest edge segments (56%) border on residential buildings. After the construction of buildings, 54% of the newly formed forest edges developed a high and steep structure. Unfavorable h/d dimension ratio was estimated for 16% of trees, more among the coniferous than among the deciduous trees. Similar characteristics of newly formed forest edges bordering on built-up areas were determined in other sub-urban forest patches, despite the smaller share of such forest edges (19% and 10%, respectively). Tools and methods presented in the research enable the implementation of concrete silvicultural practices in a realistic time period and extend to ensure that adequate forestry measures are taken to minimize possible disturbances.
Ključne besede: forest ecosystem services, forest edge stability, forest edge structure, LiDAR, urban forests
Objavljeno v DiRROS: 26.05.2020; Ogledov: 1851; Prenosov: 997
.pdf Celotno besedilo (5,67 MB)
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5.
Predlog prostorske razporeditve izbranih primestnih gozdov na podlagi daljinsko pridobljenih podatkov in terenske kontrole
David Hladnik, Sebastian Bambič, Aleš Benčina, Jan Mihelič, Žiga Repotočnik, Janez Pirnat, 2019, strokovni članek

Povzetek: V pričujočem prispevku predstavljamo predlog opredelitve t.i. primestnih gozdov na podlagi študije, ki sta jo predstavila Pirnat in Hladnik (2018), v kateri sta analizirala zgradbo krajine in povezljivost gozdov v mestnem in obrobnem območju 30 največjih slovenskih mest. Članek je služil kot osnova za delo s študenti pri dveh izbirnih predmetih Gozdovi, ljudje in trajnostne krajine in Prostorski monitoring naravnega okolja na magistrskem študijskem programu druge stopnje Gozdarstvo in upravljanje gozdnih ekosistemov. Študentje so v okviru seminarjev na podlagi predstavljene metodologije članka (Pirnat in Hladnik, 2018), zbirke podatkov o državnih cestah, podatkovne zbirke CORINE Land Cover, podatkov o gozdnih sestojih, podrobnega digitalnega modela reliefa ter na podlagi terenskih ogledov v programskem okolju ArcMap izdelali predlagane spremembe površin t. i. primestnih gozdov štirih izbranih mest (Grosuplje, Kočevje, Ljubljana, Slovenj Gradec). To delo je primerna osnova za izdelavo metodologije določanja primestnih gozdov, če se bo pokazala potreba.
Ključne besede: primestni gozdovi, krajinska ekologija, daljinsko zaznavanje, Lidar
Objavljeno v DiRROS: 23.04.2019; Ogledov: 2989; Prenosov: 834
.pdf Celotno besedilo (255,15 KB)

6.
Strukturna pestrost gozdnih sestojev na Pahernikovi gozdni posesti
Anže Martin Pintar, David Hladnik, 2018, izvirni znanstveni članek

Povzetek: Na Pahernikovi gozdni posesti je mogoče spremljati učinke in uspešnost vsaj polstoletnega gospodarjenja z raznomernimi gozdovi. Na podlagi podatkov kontrolne vzorčne metode in laserskega skeniranja Slovenije smo ocenjevali strukturno pestrost gozdnih sestojev s kazalniki in indeksi sestojnih gostot, vrstne in strukturne pestrosti debelinskih razredov, sestojnih višinskih razredov in njihovih zgornjih višin. Primerjali smo rabo zemljišč v katastrskih občinah, na katerih leži Pahernikova posest (k.o. Vuhred, Planina, Orlica in Hudi Kot), v letu 1825 z letom 2017. V vseh analiziranih katastrskih občinah se je delež gozda v tem obdobju stoletja povečal, na posesti pa se je povečal za 21,4 %. Razlike v sestojnih gostotah in kazalnikih sestojne pestrosti med sestoji, kjer gozda v začetku 19. stoletja ni bilo, in sestoji na ohranjenih gozdnih zemljiščih niso statistično značilne. V prevladujočem rastiščnem tipu kisloljubno gorsko-zgornjegorsko bukovje z belkasto bekico smo ocenili za 20 % višjo lesno zalogo od primerljivih gozdov tega rastiščnega tipa na Slovenskem. Ob višjih lesnih zalogah in visokih kazalnikih debelinske pestrosti v gozdovih na Pahernikovi posesti nismo ocenili višjih sestojnih gostot SDI kot v drugih rastiščno primerljivih gozdovih. Po gradientih nadmorskih višin smo ocenili razlike v višini in zgradbi sestojne strehe, ki vplivajo na gospodarjenje znotraj posameznega rastiščnega tipa.
Ključne besede: Franciscejski kataster, raba zemljišč, sestojna zgradba, LiDAR, sestojni višinski razredi, Pahernikova posest
Objavljeno v DiRROS: 04.02.2019; Ogledov: 5357; Prenosov: 3403
.pdf Celotno besedilo (3,25 MB)
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