Vpliv mortalitete in vrasti na razvojno dinamiko subalpinskih gozdov na Polšaku : diplomsko delo - univerzitetni študij

Vedenik, Andreja (author), Diaci, Jurij (mentor)

Raziskava je potekala leta 2010 v gozdnem rezervatu Polšak, na Dleskovški planoti v Savinjskih Alpah. Namen raziskave je bil kvantificirati spremembe in opredeliti mehanizme sukcesijskega razvoja subalpinksih gozdov, ovrednotiti pretekli in sedanji režim motenj ter z ovrednotenjem vrasti in mortalitete kvantificirati hitrost in smer sukcesijskega razvoja. Ponovljena so bila snemanja štirih sestojev iz leta 1982 na višinah od 1420 m n. v. do 1650 m n. v. in sicer dva sestoja macesna, sestoj bukve, smreke in macesna ter sestoj smreke, macesna in jelke. V vseh sestojih se je število dreves zmanjšalo (od 5% do 27 %). V pomladku je prevladovala smreka, ki se je pomlajevala v treh sestojih, macesen pa le v enem. V vseh sestojih se je temeljnica povečala (od 16,5 % do 59 %). Pri smreki in macesnu je bilo opazno dobro preraščanje dreves zgornje plasti, medtem ko so drevesa spodnje plasti odmirala zaradi pomanjkanja svetlobe. Na podlagi rezultatov je razvidno, da je bil glavni dejavnik, ki je vplival na razvojno dinamiko obravnavanih sestojev, predvsem endogena mortaliteta, ki je posledica znotrajvrstnega in medvrstnega tekmovanja. Kljub temu ni bilo mogoče ugotoviti značilne spremembe v drevesni sestavi, predvsem v smeri prevlade sencozdržnih vrst. Rezultati raziskave kažejo, da razmere zadnjih 28 let niso dopuščale hitre spremembe v strukturi ali sestavi gozdnih sestojev.

• Language: Slovenian
• Keywords: subalpski gozdovi, sekundarna sukcesija, gozdni rezervati, Polšak, macesen, smreka
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [A. Vedenik]
• Year: 2011
• Number of pages: IX, 44 f.
• PID: 20.500.12556/RUL-16038
• UDC: 630*22(043.2)=163.6
• COBISS.SI-ID: 3293350
• Publication date in RUL: 11.07.2014

Secondary language

• Language: English

Abstract

The survey took place in the forest reserve Polšak in Savinja Alps in 2010. The purpose of the study was to quantify successional changes, to identify successional mechanisms of subalpine forests development, and to evaluate pastand current disturbance regimes and based on the evaluation of mortality and recruitment to quantify speed and direction of succession. Recordings from 1982 were repeated at altitudes from 1420 m a. s. l. to 1650 m a. s. l., for four stands- two stands of larch, stand of beech, spruce and larch, and a stand of spruce, larch and fir. In all stands the number of trees decreased (from 5 % to 27 %). Regeneration is dominated by spruce, which saplings were present in three stands while larch saplings were only in one. In all stands a number of trees has decreased (from 16.5 % to 59 %). Overgrowth of the upper layers of trees was marked for spruce and larch, while in the lower layers trees are dying due to lack of light. It is shown by the results that the main factor influencing the development dynamics of the present stands is particularly endogenous mortality as a result of intra-and interspecies competition. Nevertheless, it was not possible to identify significant changes in tree composition, especially in the direction of dominance shade tolerant species. Survey results indicate that the conditions of the last 28 years did not enable rapid change in structure or composition of forest stands.