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Obročkanje kot sestavina nege gozdov : diplomsko delo - univerzitetni študij
Domanjko, Gregor (Author), Diaci, Jurij (Mentor) More about this mentor... This link opens in a new window

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/dn_domanjko_gregor.pdf This link opens in a new window

Abstract
Obročkanje je ukrep, pri katerem z odstranitvijo skorje, kambija in zadnjih nekaj branik lesa oslabimo konkurenčno sposobnost drevesa. Namen obročkanja je, pri zapoznelih redčenjih, ohraniti sestojno stabilnost. V diplomskem delu smo analizo obročkanja razdelili na dva dela. V prvem delu smo na 8-ih lokacijah, v gospodarskih enotah Gornja Radgona in Ljutomer, analizirali obstoječe objekte z obročkanimi drevesi. Na vsakem drevesu smo izmerili in določili prsni premer, povprečno višino obročkanja od tal, dolžino obročkanegadela, dolžino krošnje, osutost krošnje v %, orodje, s katerim so obročkali, in čas izvedbe. V drugem delu pa smo na 50-ih ploskvah velikosti 7x7 m izvedli časovno primerjavo med obročkanjem in podiranjem z motorno žago.Pri obročkanju smo z vejnikom preizkusili 5 metod: obročkanje na višini 0,5 m, obročkanje na 1 m, obročkanje na 1,5 m ter metodi, obročkani na višini 0,5 m in 1 m, kjer spodnji del skorje odstopa od debla. Med drevesnimi vrstamista največjo regeneracijsko sposobnost pokazali bukev in navadni beli gaber, najmanjšo pa robinija, lipovec ter trepetlika. Največji vpliv na hitrost odmiranja ima poleg drevesne vrste čas, ki poteče od obročkanja. Pri enakem prsnem premeru je klasično podiranje časovno ugodnejše do debelinske stopnje 9 cm. Nad to debelino je, z vidika stroškov, bolje obročkati. Med posameznimi metodami obročkanja smo značilno razliko glede porabe časa ugotovili med metodo, obročkano na 1 metru, in metodo, obročkano na 0,5 metra,kjer spodnji del skorje odstopa od debla. Iz naših raziskav in izkušenj priporočamo obročkanje v mladovju še naprej le točkovno v kombinaciji s klasičnim podiranjem.

Language:Slovenian
Keywords:obročkanje, racionalizacija nege gozdov, izbiralno redčenje, osutost krošnje, gozdnogospodarsko območje Murska Sobota
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2005
Publisher:[G. Domanjko]
Number of pages:IX, 56 str.
Place:Ljubljana
UDC:630*2
COBISS.SI-ID:1514150 Link is opened in a new window
Views:544
Downloads:152
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Secondary language

Language:English
Abstract:
Girdling is a measure where by removing of bark, cambium and few last annual rings, we make competitive ability of tree becoming weak. Purpose of girdling is at belated thinning to preserve stand stability. In the thesis we divided the girdling analysis on two parts. In the first part we analysed existential objects with girdled trees in 8 locations in forest management units Gornja Radgona and Ljutomer. On each tree we measured and defined thoracic diameter, approximate height of girdling from the ground, length of girdled section, length of crown, fall off of crown in percentage (%), tool with which they executed girdling and execution time. In the second part we executed the time comparison between girdling and felling by chain saw on 50 areas of dimension 7x7 m. We tested 5 methods with girdling by hatchet: girdling at 0,5 m of height, girdling at 1 m of height, girdling at 1,5 m of height and method girdled at 0,5 m and 1 m of height where bottom part of bark is tearing apart from trunk of tree. Among tree genus greatest regenerative ability indicated beech and ordinary white beech (hornbeam), when the least regenerative abilitymanifested non-indigenous robinia, linden and trembling tree. Greatest influence on dying away speed besides tree genus also has the time past from girdling. At the same thoracic diameter the classical felling is more favourable considering time up to thickness of 9 mm. Above this thickness, from point of view of expenses it is better to perform girdling. Between individual girdling methods we found out distinctive difference considering use of time between girdling method at 1 m of height and the girdling method at 0,5 m where bottom part of bark is tearing apart from trunk of tree. On thebasis of our researches and experiences we suggest prosecution of girdling in seedling only at points and combined with classical tree felling.


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