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Query: "author" (Urša Vilhar) .

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Rainfall interception in urban forests is related to stand structure
Janez Kermavnar, Urša Vilhar, 2016, published scientific conference contribution abstract

Published in DiRROS: 03.11.2021; Views: 342; Downloads: 131
.pdf Full text (4,38 MB)

4.
Fine root dynemics in Slovenian beech forests in relation to soil temperature and water availability
Peter Železnik, Urša Vilhar, Mike Starr, Maarten De Groot, Hojka Kraigher, 2015, published scientific conference contribution abstract

Published in DiRROS: 03.11.2021; Views: 285; Downloads: 109
.pdf Full text (1,05 MB)

5.
Empirical approach for modelling tree phenology in mixed forests using remote sensing
Koffi Dodji Noumonvi, Gal Oblišar, Ana Žust, Urša Vilhar, 2021, original scientific article

Abstract: : Phenological events are good indicators of the effects of climate change, since phenological phases are sensitive to changes in environmental conditions. Although several national phenological networks monitor the phenology of different plant species, direct observations can only be conducted on individual trees, which cannot be easily extended over large and continuous areas. Remote sensing has often been applied to model phenology for large areas, focusing mostly on pure forests in which it is relatively easier to match vegetation indices with ground observations. In mixed forests, phenology modelling from remote sensing is often limited to land surface phenology, which consists of an overall phenology of all tree species present in a pixel. The potential of remote sensing for modelling the phenology of individual tree species in mixed forests remains underexplored. In this study, we applied the seasonal midpoint (SM) method with MODIS GPP to model the start of season (SOS) and the end of season (EOS) of six different tree species in Slovenian mixed forests. First, substitute locations were identified for each combination of observation station and plant species based on similar environmental conditions (aspect, slope, and altitude) and tree species of interest, and used to retrieve the remote sensing information used in the SM method after fitting the best of a Gaussian and two double logistic functions to each year of GPP time series. Then, the best thresholds were identified for SOS and EOS, and the results were validated using cross-validation. The results show clearly that the usual threshold of 0.5 is not best in most cases, especially for estimating the EOS. Despite the difficulty in modelling the phenology of different tree species in a mixed forest using remote sensing, it was possible to estimate SOS and EOS with moderate errors as low as <8 days (Fagus sylvatica and Tilia sp.) and <10 days (Fagus sylvatica and Populus tremula), respectively.
Keywords: phenology modelling, start of season, end of season, remote sensing, MODIS GPP, vegetation indices, threshold methods
Published in DiRROS: 23.08.2021; Views: 460; Downloads: 310
.pdf Full text (2,63 MB)
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6.
Strategija razvoja mestnih gozdov Ljubljane
Tina Simončič, Matjaž Harmel, Jurij Kobe, Robert Hostnik, Andrej Verlič, Urša Vilhar, Klemen Strmšnik, Luka Sešel, Rok Pisek, Dragan Matijašič, 2021, professional article

Abstract: Strategija razvoja mestnih gozdov Ljubljane opredeljuje vizijo in dolgoročne prioritete celovitega razvoja mestnih gozdov Ljubljane. Strategija je podlaga za upravljanje z mestnimi gozdovi, ki pomembno prispevajo k zagotavljanju zdravega življenjskega okolja za prebivalce in obiskovalce mesta. Strategija izraža/upošteva interes lokalne skupnosti do gozdov v mestu in njegovi neposredni okolici ter prispeva k odgovornemu načrtovanju gospodarjenja z gozdovi za potrebe skupnosti. Strategija je bila na pobudo Mestne občine Ljubljana izdelana v okviru projekta INTERREG URBforDAN za območje mestnih gozdov Ljubljane, torej vseh tistih, ki so po občinskem prostorskem načrtu opredeljeni kot gozdovi z izjemno poudarjenimi socialnimi funkcijami. Namen strategije je spodbuditi različne institucije, nevladne organizacije in posameznike k aktivnejšemu vključevanju v soodločanje o razvoju mestnih gozdov Ljubljane, krepiti zavest o pomenu teh gozdov ter izboljšati podlage za gospodarjenje z gozdovi, ki krepi socialne in ekološke funkcije. V prispevku so podane poglavitne značilnosti Strategije razvoja mestnih gozdov Ljubljane vključno s cilji in usmeritvami. Strategija nastavlja okvirje za sistem organizacijskih, finančnih in drugih ukrepov, s katerim bi lahko izboljšali usklajevanje javnih interesov v urbanem gozdnem prostoru, ki je pretežno v zasebni lasti. Izpostavlja tudi pomen sodelovanja z zasebnimi lastniki za zagotavljanje socialnih funkcij v mestnih gozdovih.
Keywords: pomen mestnih gozdov, strateški načrt, upravljanje, Ljubljana, projekt URBforDAN
Published in DiRROS: 02.08.2021; Views: 641; Downloads: 209
.pdf Full text (336,18 KB)

7.
Green space area and type affect bird communities in a South-eastern European city
Maarten De Groot, Katarina Flajšman, Tomaž Mihelič, Urša Vilhar, Primož Simončič, Andrej Verlič, 2021, original scientific article

Abstract: Urbanization decreases the species richness and results in the homogenization of bird communities. Bird species are important indicator species for biodiversity and reflect the habitat quality of urban forests and other green spaces. In this study we investigated the key drivers that influence bird communities in urban forests and green spaces in the Southeastern European city of Ljubljana, Slovenia. We were interested in how the number of species, species dissimilarity and indicator species are affected by the type of green space (urban forest vs park), area of green space and type of urbanization (urban vs peri-urban areas). We sampled birds twice in 2012 in 39 standardized point counts across Ljubljana. We found that the abundance was influenced by the area of the green space. Species dissimilarity and species turnover are affected by the area and type of green space. Interestingly, the analysis showed that the species composition of peri-urban areas was similar to that of urban areas. Indicator species were found for all environmental variables. On the basis of the results, we suggest the strategy that would increase the diversity of birds and increase the stability of their populations in urban areas. Urban planners should encourage 1) both forests and parks since they harbour different species of birds, 2) larger green spaces since larger areas have species that are more typical of larger areas and 3) a mosaic of a larger number of smaller forest remnants combined with larger forest complex serving as source areas.
Keywords: urban forest, bird species composition, forest remnant, urbanization, peri-urban forest, bird monitoring, species richness
Published in DiRROS: 14.06.2021; Views: 558; Downloads: 304
.pdf Full text (842,93 KB)
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8.
Gozdne učne točke v mestnem gozdu Golovec
Urša Vilhar, 2021, treatise, preliminary study, study

Keywords: drevesne vrste, urbani gozdovi, ekosistemske storitve, gozdne funkcije, gozdna pedagogika, gozdne učne poti
Published in DiRROS: 22.04.2021; Views: 808; Downloads: 269
.pdf Full text (3,67 MB)

9.
Opisi drevesnih vrst v mestnem gozdu Golovec
Urša Vilhar, 2021, treatise, preliminary study, study

Keywords: drevesne vrste, urbani gozdovi, gozdne učne točke
Published in DiRROS: 22.04.2021; Views: 776; Downloads: 178
.pdf Full text (5,66 MB)

10.
Benefits of urgan forest : just one step away from the city
Urša Vilhar, 2021, not set

Published in DiRROS: 22.04.2021; Views: 520; Downloads: 217
.pdf Full text (172,67 KB)
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