Vpliv svetlobnih razmer na pomlajevanje v pragozdnem rezervatu Krokar

Bončina, Živa (author), Diaci, Jurij (mentor)

Predmet diplomske naloge je preučevanje naravnega pomlajevanja drevesnih vrst v pragozdu Krokar. Na sistematično določenih vzorčnih ploskvah (N = 124, velikost posamezne ploskve 1,5 m x 1,5 m) se je snemalo znake o zeliščni plasti, pomladku, sestoju in reliefu ter izmerilo vrednosti direktne in difuzne svetlobe. Vrednost povprečne difuzne svetlobe je bila 4,7 %, direktne pa 3,8 %. Ugotovljene vrednosti svetlobnih razmer so podobne vrednostim, ki sojih ugotovili pri analizah pragozdov v Sloveniji in na tujem. Gostota pomladka brez klic je znašala 29000 ha-1, prevladovala sta bukev (59 %) in gorski javor (39 %). Analiza višinske strukture pomladka kaže, da se delež bukve z naraščajočo višino povečuje, delež javorja pa močno zmanjšuje. Povezave med svetlobo in gostotami in zastiranjem pomladka so bile večinoma šibko pozitivne, a v glavnem niso bile statistično značilne. Zastiranje pritalne vegetacije, v kateri prevladuje Allium sp., je večje kot v drugih pragozdovih v Sloveniji. Ugotovljeno je bilo, da na pomladek poleg svetlobe pomembno vpliva konkurenca z zeliščno plastjo, ki je lahko celo glavni omejujoči dejavnik.

• Language: Slovenian
• Keywords: naravno pomlajevanje, svetlovne razmere, gozdovi, pritalna vegetacija, pragozdovi, Krokar
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [Ž. Bončina]
• Year: 2011
• Number of pages: VIII, 38 f.
• PID: 20.500.12556/RUL-17769
• UDC: 630*18(043.2)=163.6
• COBISS.SI-ID: 3245734
• Publication date in RUL: 11.07.2014

Secondary language

• Language: English
• Title: Influence of light conditions on natural regeneration in the Krokar virgin forest

Abstract

The subject of the study was natural regeneration of tree species. Data on herb layer, regeneration, stand, and topography were registered on 124 systematic sample plots, 1,.5 m x 1,5 m each, and direct and diffuse light wasmeasured. The average diffuse and direct light values amounted to 4,7 % and3,8 %, respectively. The measured values were similar to the ones gathered in analyses of virgin forests in Slovenia and abroad. The regeneration density, germs excluded, amounted to 29000 ha-1, with beech (57 %) and sycamore (41 %) prevailing. With the increase of height of regeneration, the proportion of beech increases, while the proportion of sycamore decreases. Light intensity positively influence the regeneration density and regenerationcoverage; however, the correlations are mainly insignificant. The coverage by ground vegetation, with Allium sp. prevailing, is higher when compared to other virgin forests in Slovenia. The analysis showed that, apart from light conditions, herb layer is an important if not the main limitation factor for natural regeneration.

• Keywords: natural regeneration, light conditions, forests, ground vegetation, jungle forests, Krokar