Ocena skladnosti inventurnih podatkov o manjšinskih drevesnih vrstah z dejanskim stanjem v sestojih

Luzar, Luka (author), Klopčič, Matija (mentor)

V diplomski nalogi smo primerjali podatke o prisotnosti drevesnih vrst v javno dostopnih evidencah Zavoda za gozdove Slovenije z dejanskim stanjem na območju Tivolskega hriba v Ljubljani. Na 40,5 ha velikem območju smo s terenskim popisom evidentirali drevesne vrste ter jim izmerili prsni premer, ocenili kakovost in vitalnost ter zabeležili lokacijo. Prostorsko razporeditev smo analizirali v programu QGIS. Evidentirali smo 193 dreves 21 drevesnih vrst, ki so zastopane v manjšem deležu, oziroma 4,8 drevesa/ha. V evidencah ZGS je bilo navedenih 13 drevesnih vrst, s terenskim popisom pa smo skupno ugotovili 31 drevesnih vrst. S tem smo potrdili hipotezo, da je dejanska vrstna pestrost večja od prikazane v evidencah. Skupni volumen vrst z manjšim deležem (manjšinskih vrst) je znašal 123 m³ oziroma 3,04 m³/ha, kar predstavlja 0,9 % lesne zaloge. Povprečni prsni premer je znašal 21 cm, 78,8 % dreves pa je bilo v debelinskem razredu 10–30 cm. Povprečna ocena kakovosti je bila 3,3, zato smo hipotezo o prevladi tankega drevja slabše kakovosti potrdili le delno. Povprečna ocena vitalnosti je bila 2,5, kar kaže na ugodno vitalnost. V 20-metrskem pasu ob cestah in poteh je raslo 59 % analiziranih dreves.

• Language: Slovenian
• Keywords: manjšinske drevesne vrste, gozdna inventura, vrstna pestrost, prostorska razporeditev, Tivolski hrib
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Publisher: [L. Luzar]
• Year: 2026
• PID: 20.500.12556/RUL-188144
• UDC: 630*5:630*17(043.2)
• COBISS.SI-ID: 292364291
• Publication date in RUL: 19.09.2026

Secondary language

• Language: English
• Title: Consistency evaluation between inventory data on minority tree species and actual state in forest stands

Abstract

In this thesis, we compared data on the presence of tree species in publicly available databases of Slovenia Forest Service with actual situation in the Tivolski hrib forest area in Ljubljana. In the 40.5 ha study area, tree species were recorded during a field survey. For each tree, diameter at breast height was measured, quality and vitality were assessed, and its location was recorded. Spatial distribution was analysed using QGIS. A total of 193 trees belonging to 21 tree species with minor proportions in the growing stock were recorded, corresponding to 4.8 trees/ha. The Slovenia Forest Service databases listed 13 tree species, while the field survey identified a total of 31 tree species. This confirmed the hypothesis that actual tree species diversity is greater than shown in the inventory data. The total volume of tree species with minor proportions was 123 m³ or 3.04 m³/ha, representing 0.9% of the total growing stock. The mean diameter at breast height was 21 cm, and 78.8% of the trees were in the 10–30 cm diameter class. The mean quality score was 3.3. The hypothesis that thin trees of poorer quality prevail was only partly confirmed. The mean vitality score was 2.5, indicating favourable vitality. Overall, 59% of the analysed trees were located within 20 m of roads and paths.

• Keywords: minority tree species, forest inventory, tree species diversity, spatial distribution, Tivolski hrib