Obnova gozda po gradaciji velikega smrekovega lubadarja (Ips typhographus) v GGE Vrbovrec : magistrsko delo - 2. stopnja

Krese, Anže (author), Diaci, Jurij (mentor)

V GGE Vrbovec se je v letu 2003 v zasmrečenih sestojih na rastišču dinarskega jelovega bukovja s srobotom pojavila obsežna gradacija velikega smrekovega lubadarja (Ips typhographus). Namen raziskave je bil ugotoviti stanje in razvoj pomladka ter identificiranje glavnih vplivnih dejavnikov po desetletju razvoja. V ta namen je bilo popisanih skupno 240 ploskev, ki so bile enakomerno zastopane glede na ograjenost, osvetljenost (središče / rob vrzeli) in glede na relief (plato / vrtača). Na ploskvah je bil opravljen popis zeliščne plasti in pomladka lesnatih vrst, ki so bile razvrščene v starostne in višinske razrede. Rezultati analize pomladka so pokazali, da je gostota drevesnih vrst 43.000 primerkov/ha. V pomladku je prevladovala smreka (65 %), sledili so ji pionirji (20 %). Ugotovljeno je bilo, da delež smreke upada, medtem ko narašča delež listavcev, najbolj izrazito pionirjev. Ograjenost vrzeli je pozitivno vplivala na gostoto smreke in pionirjev, hkrati pa je je bila višinska struktura pomladka na ograjenih vrzelih izrazito ugodnejša. Gostote nekaterih vrst so bile v negativni povezavi z razdaljo do semenskih dreves (lipovec) in robom ohranjenega sestoja (smreka). Zastrtost zelišč in skalovitost sta negativno vplivala na razvoj smreke in pionirjev. Semenski potencial in stabiliziranje mikroklimatskih razmer v prihodnje (8-10 let) kažejo na razvoj klimaksnih drevesnih vrst (predvsem bukve).

• Language: Slovenian
• Keywords: naravno pomlajevanje, veliki smrekovi lubadarji, Picea abies (L.) Karst, semenska drevesa
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [A. Krese]
• Year: 2014
• Number of pages: X, 80 str.
• PID: 20.500.12556/RUL-115292
• UDC: 630*2321311.2:630*174.7Picea abies (L.) Karst(043.2)=163.6
• COBISS.SI-ID: 3882662
• Publication date in RUL: 22.04.2020

Secondary language

• Language: English
• Title: Forest regeneration following an European spruce bark beetle (Ips typhographus) outbreak in management unit Vrbovec

Abstract

In 2003 in the management unit Vrbovec a massive bark beetle (Ips typhographus) outbreak occurred in Norway spruce dominated stands on submountain Dinaric beech-silver fir forest site. The aim of this research was to determine the current status and development of regeneration, and to identify the main influencing factors after decade of development. Therefore, 240 plots were inventoried. The plots were equally represented according to the fencing, position within opening (centre / edge of opening) and relief (plateau / sink-hole). On each plot herb layer and seedlings according to the species were inventoried. Seedlings were grouped into age and height classes. Seedlings analysis results showed that the density of tree species is 43.000 specimens / ha. The regeneration was dominated by Norway spruce (65 %), followed by the pioneers (20 %). It was found out that proportion of spruce decreases, while the proportion of deciduous trees increases. This is most notable with the pioneers. Fenced openings had a positive impact on the density of spruce and pioneers, with a more favourable height structure of the regeneration within the fenced openings. Density of some species was negatively correlated with the distance to the seed trees (lime) and the edge of the remnant stands (spruce). Herb coverage and rockiness had a negative impact on the development of spruce and pioneers. The seed potential and stabilisation of microclimate conditions indicate that in the future (8-10 years) climax tree species (mainly beech) will regenerate.