Vpliv naravnih motenj na gospodarjenje z gozdovi na Bovškem

magistrsko delo

Matevž Konjar (Author), Matija Klopčič (Mentor)

Abstract

V raziskavi smo analizirali strukturo poseka na Bovškem v obdobju 1995–2020 s poudarkom na sanitarnem poseku zaradi vetra, podlubnikov in jesenovega ožiga ter skušali poiskati glavne vplivne dejavnike, ki vplivajo na verjetnost pojavljanja vetrolomov in podlubnikov. Pridobili smo podatke o količini in strukturi poseka za raziskovalno območje v obdobju 1995–2020 ter podatke o 26 lokacijah vetrolomov z znanim časom nastanka in 26 odsekih, poškodovanih s strani podlubnikov. Podatke smo analizirali s pomočjo metod opisne statistike, bivariatne analize in binarne logistične regresije. V raziskovalnem območju smo zaznali izrazito povečanje sanitarnega poseka po letu 2018. Glavna vzroka sanitarnih sečenj sta bila veter in podlubniki. Jesenov ožig je bil vzrok za manjši delež poseka. Binarna logistična regresija je kot ključne dejavnike za pojav vetrolomov izpostavila kamnitost ter prisotnost preteklih motenj in valovitega reliefa. Bivariatne analize so pokazale tudi, da se vetrolomi pojavljajo predvsem v debeljakih z visoko lesno zalogo, ki rastejo na zmernih do strmih rebrih z južno ekspozicijo, imajo tesen ali vrzelast sklep in večji delež mladja. Izpostavila je tudi vpliv močnih jugozahodnih vetrov, ki prinašajo obilne padavine. Za pojav podlubnikov je binarna logistična regresija kot ključne dejavnike izpostavila višino lesne zaloge in delež iglavcev. Bivariatne analize so pokazale tudi, da se podlubniki pogosteje pojavljajo v odsekih z valovitim reliefom in jugovzhodno ekspozicijo, večjim deležem mladja in sestojev v obnovi ter nižjim deležem drogovnjakov.

Keywords

gozdarstvo;gozdovi;naravne motnje;vetrolomi;podlubniki;dejavniki;ukrepi;

Data

Language:	Slovenian
Year of publishing:	2022
Typology:	2.09 - Master's Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[M. Konjar]
UDC:	63042+63045+630*41(497.4Bovec)"1995/2020"(043.2)=163.6
COBISS:	97460227
Views:	213
Downloads:	56
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	ǂThe ǂimpact of natural disturbances on forest management in the Bovec region
Secondary abstract:	The research analyzed the structure of harvested timber in the Bovec region in the period 1995–2020 with an emphasis on sanitary felling due to windthrow, bark beetles and ash dieback. Research also determined the main influencing factors affecting the probability of windthrow and bark beetle outbreaks. Data on the amount and structure of felling were obtained for the research area in the period 1995–2020, as well as data on 26 locations of windthrow with a known time of occurrence and 26 areas damaged by bark beetles. Data were analyzed using descriptive statistics, bivariate analyses and the binary logistic regression. In the research area, significant increase in the amount of sanitary felling after 2018 was detected. The main causes of sanitary felling were windthrow and bark beetle outbreaks, while ash dieback contributed only a smaller share. Binary logistic regression highlighted stoniness, the presence of past disturbances and undulating relief as key factors for the occurrence of windthrow. Bivariate analyses showed that windthrow mainly occurs on moderate to steep ridges with southern exposure, in mature stands with a high growing stock, dense or partly-opened canopy cover, and higher proportion of regeneration stages. Analysis also proved the impact of strong south-western winds. For the occurrence of bark beetle outbreaks, the binary logistic regression highlighted growing stock and share of conifers as key influential factors. Bivariate analyses indicated that bark beetles occurred more frequently in areas with undulating relief, south-eastern exposure, higher proportion of regeneration and stands under regeneration, and a lower proportion of pole stands.
Secondary keywords:	forestry;forests;natural disturbance;windthrow;bark beetle;factors;measures;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. Ljubljana, Biotehniška fak., Oddelek za gozdarstvo in obnovljive gozdne vire
Pages:	XI, 71 f., [10] f. pril.
ID:	14427188