Vpliv velikosti vzorca inventurnih ploskev na zanesljivost ocene stopnje objedenosti gozdnega mladja: primer lovišča Peca-Mežica

Štern, Helena (author), Klopčič, Matija (mentor)

V raziskavi smo želeli ugotoviti gostoto, vrstno strukturo, skupno in vrstno-specifične stopnje objedenosti gozdnega mladja ter optimalno stopnjo vzorčenja za oceno objedenosti gozdnega mladja na manjših območjih, da bo ta ocena dovolj zanesljiva za ustrezno odločanje v postopku obnove gozdnogospodarskih in lovsko upravljavskih načrtov na različnih prostorskih ravneh. Raziskovalni objekt je predstavljalo lovišče Peca-Mežica, ki meri 4485 ha in je locirano v Mežiški dolini na Koroškem, v njem prevladujejo bukova rastišča. V lovišču in celem GGO je prisotne največ srnjadi, sledita ji gams in navadni jelen. Metodologijo analize gozdnega mladja smo prevzeli po Zavodu za gozdove Slovenije in jo delno modificirali, saj smo poleg objedenosti terminalnih brstov pri popisu upoštevali tudi objedenost lateralnih poganjkov. Največja gostota mladja je bila skupno zabeležena v višinskem razredu do 15 cm. V drevesni sestavi mladja je prevladovala smreka, sledila sta gorski javor in bukev, ostalih vrst je bilo znatno manj. Skupna stopnja objedenosti (O) je znašala 52,3 %, skupna stopnja tekoče letne objedenosti (TLO) pa 26,6 %. Jelka, kot splošno priljubljena vrsta v prihrani divjadi, se je tudi v našem primeru izkazala kot močno objedena (O = 93,5 %, TLO = 68,4 %). Menimo, da v našem primeru skupna stopnja tekoče objedenosti (TLO) bolje nakazuje aktualni vpliv rastlinojedcev na gozdno mladje. Kot še ustrezno za razmere v raziskovalnem objektu smo določili 20-% vzorčno napako, po analizah naj bi za njeno doseganje zadoščal vzorec 23 popisnih ploskev.

• Language: Slovenian
• Keywords: Gozdno mladje, stopnja objedenosti, lovišče, lateralni poganjki, divjad
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Publisher: [H. Štern]
• Year: 2023
• PID: 20.500.12556/RUL-150593
• UDC: 630*52:630*45(497.4Mežica)(043.2)=163.6
• COBISS.SI-ID: 165682435
• Publication date in RUL: 21.09.2023

Secondary language

• Language: English
• Title: The influence of inventory plot sample size on the reliability of the regeneration browsing rate assessment: the case of the hunting ground Peca-Mežica

Abstract

The main aims of our study were to determine the density and species composition and the overall and species-specific browsing rates of regeneration, and to determine the optimal sample size of census plots for estimating the overall browsing rate in regeneration, in order to make its estimation reliable to be used in forest and wildlife management planning. The study area was the Peca-Mežica hunting area, which covers 4485 ha and is located in the Mežica valley in the Koroška region. The area is dominated by the European beech forests. In the hunting ground and the entire region roe deer prevail, followed in abundance by chamois and red deer. The inventory methodology was adopted from the Slovenian Forest Service and partly modified: the browsing of lateral shoots was registered in addition to the browsing of the terminal bud. The highest total density of regeneration was recorded in the height class up to 15 cm. Spruce dominated the species composition, followed by sycamore maple and European beech, while other species were significantly less abundant. The overall browsing rate (O) was 52.3%, while the total current browsing rate (TLO) was 26.6%. Silver fir, as a generally popular species for browsing, was found to be heavily browsed in the study area (O 93.5%, TLO 68.4%). In our case, we believe that the total current browsing rate better indicates the contemporary impact of herbivores on forest regeneration. A sampling error of 20% was defined as still appropriate in the conditions present in the research area, and analyses suggested that the sample of 23 census plots would be sufficient to achieve this error.

• Keywords: forest browse, overbrowsing rate, hunting ground, lateral sprout, game