Spremembe in zgradba zgornje gozdne meje na Snežniku

diplomsko delo - univerzitetni študij - 1. stopnja

Jan Mohar (Author), Matija Klopčič (Mentor), David Hladnik (Co-mentor)

Abstract

Diplomsko delo obravnava spremembe v pomiku zgornje gozdne meje (ZGM) med letoma 1954 in 2015 ter zgradbo ZGM preko analize vzdolžnih profilov terena in vegetacije v glavnih smereh neba in analize sestojne zgradbe in sestave na začasnih raziskovalnih ploskvah. Aktualno ZGM smo določili z uporabo lidarskih podatkov in digitalnega modela krošenj, ki smo ga izdelali v programskem orodju ArcMap, v katerem smo izdelali tudi vzdolžne profile. Inventuro gozdnih sestojev pod in ob ZGM ter posameznega drevja nad ZGM smo izvedli na transektu petih začasnih raziskovalnih ploskev velikosti 30 % 10 m. V opazovanem obdobju 1954-2015 se potek ZGM ni bistveno spremenil, se pa je ruševje do leta 2009 močneje razširilo. Gozdne sestoje ob ZGM sestavljajo le bukve, s posameznimi bukvami, ki uspevajo nad ZGM, pa se mešajo jerebike, gorski javori in jelke. Smreka, ki je bila v pritlikavi obliki opažena višje po pobočju, na ploskvah ni bila zajeta. Sestoji, ki gradijo ZGM, so vitalni in nimajo veliko poškodb. Iz izdelanih vzdolžnih profilov smo opazili različne oblike ZGM, ki je lahko postopna ali pa je prehod v ruševje oster. Iz profilov in analiz po ploskvah je razvidno postopno zniževanje sestojne višine in prisotnost posameznih dreves v ruševju nad ZGM. Spremembe ZGM v zadnjih 60 letih so bile majhne in v bližnji prihodnosti najverjetneje ne bomo zasledili večjih sprememb. Pričakovano pa je nadaljnje širjenje ruševja, ki še ni poraslo vseh odprtih površin in travišč.

Keywords

zgornja gozdna meja;sestojna meja;Snežnik;vzdolžni profil;sestojna zgradba;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[J. Mohar]
UDC:	630*22(497.4Snežnik)(043.2)=163.6
COBISS:	79008771
Views:	223
Downloads:	37
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Changes and structure of the upper timberline on the Snežnik Mountain
Secondary abstract:	The research deals with changes of the upper forest border (UFB) between 1954 and 2015, as well as with its structure studied through the analysis of longitudinal terrain and vegetation profiles in the cardinal directions, and the analysis of stand structure and composition on temporary research plots. The actual UFB was determined using the LiDAR data and digital crown model in the ArcMap software; the same software was used to derive the longitudinal terrain and vegetation profiles. The inventory of forest stands below and on the actual UFB, as well as individual trees above the UFB, was performed on five temporary research plots of 30 % 10 m. No major changes of the UFB was observed in the period 1954-2015, yet the mountain pine areas expanded to a large extent till 2009. Forest stands on the UFB consist of beech only, whereas individual beech trees above the UFB are mixed with rowan, sycamore maple and spruce trees. Spruce was not surveyed on the research plots, but was detected higher up the slope. Forest stands on the UFB were vital and with minor injuries. Different forms of the UFB were observed, it can be gradual or sharp. Gradual decreasing in stand height was evident, as well as the increased presence of individual trees above the UFB. Only minor UFB changes were observed in the last 60 years, thus no major changes are expected in the near future. Yet, the expansion of mountain pine areas can be expected on grassland and other open spaces.
Secondary keywords:	upper timberline;forest line;Snežnik;upper timberline profile;tree height;tree diameter;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za gozdarstvo in obnovljive gozdne vire
Pages:	X, 47 f., [8] f. pril.
ID:	13490601