Učinki različnih načinov izbiralnega redčenja na odziv izbranih dreves v smrekovo-bukovih sestojih na Mežakli

Mencinger, Valentina (author), Roženbergar, Dušan (mentor)

Leta 2016 so izvedli tretjo meritev na raziskovalnih ploskvah v bukovih drogovnjakih na Mežakli, ki so bile zasnovane leta 2005. Preverjali so tri načine izbiralnega redčenja in kontrolo, kjer niso ukrepali: klasično izbiralno redčenje z običajno jakostjo (način dela 60), izbiralno redčenje s 50 % manj izbrancev in običajno jakostjo (način dela 30) ter izbiralno redčenje z 75 % zmanjšanjem števila izbrancev in močno jakostjo ukrepanja (način dela 15). Izbrancem so določili drevesno vrsto, izmerili premer, višino, dolžino čistega debla, prešteli število vej na prvih 4 in 8 m debla in določili asimetričnost, poškodovanost in sproščenost krošnje. Način dela 15 se je izkazal za najboljšega pri debelinskem prirastku, upadu dimenzijskega razmerja in povečanju velikosti krošnje. Način dela 30 je najbolj pozitivno vplival na višinski prirastek izbranih dreves in skupno število vej na prvih 8 m dolžine debla. Najmanjše zmanjšanje krošenj so opazili pri načinu dela 60. Velik vpliv na rezultate so imele ujme, zaradi katerih je med letoma 2005 in 2016 izpadlo 12,8 % izbrancev. Za najboljši način dela so izbrali način dela 30, za najmanj primernega pa se je izkazal način dela 15.

• Language: Slovenian
• Keywords: bukovi gozdovi, nega gozdov, redčenje, drogovnjaki, ujme, Mežakla
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: BF - Biotechnical Faculty
• Publisher: [V. Mencinger]
• Year: 2017
• PID: 20.500.12556/RUL-95732
• UDC: 630*24(497.4Mežakla)(043.2)=163.6
• COBISS.SI-ID: 4871590
• Publication date in RUL: 21.09.2017

Secondary language

• Language: English
• Title: Effects of difrent thinning regimes on crop trees response in spruce-beech strands on Mežakla

Abstract

In 2016, the third measurement was performed on research plots established in 2005 in the Mežakla's beech stands. Three thinning methods were studied and control with no treatment: conventional thinning with normal cutting intensity (Method 60), thinning with 50 % lower density of crop trees and normal cutting intensity (Method 30), and thinning with 75 % lower density of crop trees and strong thinning intensity (Method 15). For crop trees tree species was determined, their diameter, height and the length of trunk without branches was measured, the number of branches at the first 4 and 8 metres of trunk was counted, and crown asymmetry, damage and growing space were examined. The treatment 15 has shown to be the best for increasing the diameter, decreasing h/d ratio and crown growth. Method 30 was proven best for increasing the height of crop trees and a total number of branches at the first 8 metres of trunk. The smallest decrease in crown size was detected in Method 60. Natural disturbances decreased the number of crop trees by 12.8 % between 2005 and 2016. Method 30 was determined to be the best treatment method, while Method 15 seemed to be the least appropriate.

• Keywords: beech stands, forest tending, thinning, natural disasters, Mežakla