Zgradba in razvojna dinamika pragozdnega rezervata Donačka gora : diplomsko delo - visokošolski strokovni študij

Hajšek, Andrej (author), Diaci, Jurij (mentor)

Namen diplomske naloge je bil preučiti razvojno dinamiko sestojnih vrzeli in vzpostaviti trajno raziskovalno ploskev velikosti 0,8 ha v pragozdu Donačka gora. Pri popisu sestojnih vrzeli je bil uporabljen severnoameriški pristop (metoda linijskih presekov). Pragozd Donačka gora meri 37,54 ha, raziskavo pa je bila opravljena v srednjem, najbolj ohranjenem delu pragozda, v letu 2011. Na treh transektih je bilo evidentiranih 39 vrzeli in v njih popisanih 144 vrzelnikov. Delež vrzeli na celotni dolžini transektov je znašal 12,6 %, deležrazširjenih vrzeli pa 41,9 %. Srednja velikost vrzeli je merila 231,57 m2, 57 % vrzeli pa je bilo manjših od 200 m2. Ugotovljeno je bilo, da se v vrzelih pojavljajo vrzelniki v različnih stopnjah razkroja, kar kaže na postopno širjenje vrzeli. Z analizo je bilo ugotovljeno, da ima največ vrzeli med 2 in 5 vrzelnikov. Pomlajevanje poteka malopovršinsko v vrzelih, prevladujoča drevesna vrsta tako v pomladku kot v zgornji drevesni plasti pa je bila bukev. Svetloljubne drevesne vrste se uspešno pomlajujejo le v nekaterih vrzelih večjih od 500 m2. Analiza podatkov iz raziskovalne ploskve je pokazala, da znaša gostota živih dreves 175 dreves na hektar, volumen živih dreves pa 496 m3/ha. Frekvenčna porazdelitev premerov živih dreves na ploskvi po debelinskih stopnjah je padajoča, kar kaže na raznomerno zgradbo pragozda. Volumen odmrlih dreves je znašal 158,20 m3/ha ali 24,2 % od skupne lesne zaloge na raziskovalni ploskvi, kar kaže na pragozdni značaj teh sestojev. Med odmrlimi drevesi so prevladovale podrtice, njihov delež je znašal 83,4 % volumna odmrlih dreves.

• Language: Slovenian
• Keywords: pragozdovi, Donačka gora, sestojne vrzeli, bukovi gozdovi, zgradba gozdov, stalne raziskovalne ploskve
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [A. Hajšek]
• Year: 2012
• Number of pages: VII, 55 str.
• PID: 20.500.12556/RUL-38061
• UDC: 630*22(497.4Donacka gora)(043.2)=163.6
• COBISS.SI-ID: 3403430
• Publication date in RUL: 10.07.2015

Secondary language

• Language: Unknown
• Title: Structure and dynamics of old-growth forest reserve Donačka gora

Abstract

The purpose of the thesis was to study gap dynamics and establish a permanent research plot (0,8 ha) in old-growth forest reserve Donačka gora. North- American approach (line intercept sampling) was used for canopy gap survey. The old-growth forest reserve Donačka gora encompasses 39,15 ha. We used only most preserved core area for our research which was done in 2011. On three transects we captured 39 gaps and 144 gap makers. Gap and expanded gap fractions reached 12,6 % and 41,9 %, respectively. The mean gap size was 231,57 m2, 57 % of the gaps were smaller than 200 m2. It was found out that gap makers in gaps are appearing in different phases of decay, which implies progressive spreading of gaps. Analysis showed that most of the gaps include 2to 5 gap makers. Small-scale regeneration patterns were observed within gaps,the main tree species in regeneration and in upper canopy layer was beech. Light demanding tree species were successfully regenerated only in gaps larger than 500 m2. Analysis of data from research plot showed that the density of live trees was 175 trees per hectare and volume of live trees reached 496 m3/ha. Frequency distribution of diameters of live trees on the plot was close to negative exponential, which indicates uneven structure of the forest. The volume of dead trees reached 158,20 m3/ha or 24,2 % of the total growing stock on the plot, which shows old-growth characteristics of these stands. Within the dead trees downed trees prevailed, their share reached 83,4 % of the total volume of dead trees.