Določanje indeksa listne površine listnatega gozda na povodju Dragonje

Šraj, Mojca (author)

Meritve in določanje indeksa listne površine (LAI) so se izvajale v listnatem gozdu na eksperimentalnem povodju Dragonje. Poleg teh meritev so bile sočasno narejene natančne meritve in analize posameznih komponent hidrološkega kroga gozda in drugih parametrov vegetacije s sodobno mersko opremo. V prvem delu članka (Šraj, 2003b) so bile predstavljene metode določanja indeksa listne površine in meritve LAI. Prav tako so v prvem delu članka natančno opisane lastnosti dreves na obeh izbranih raziskovalnih ploskvah. V tem delu članka so predstavljeni rezultati meritev in določanja indeksa listne površine ter njihova analiza. Meritve so se začele v jeseni 2000. Najpogostejšim drevesnim vrstam (hrast, jesen, gaber, javor, dren) je bila določena specifična površina listov SLA. Indeks listne površine LAI se je določal po treh metodah: neposredni metodi zbiranja odpadlega listja, metodi hemisferičnega fotografiranja in metodi merjenja fotosintetskega aktivnega sevanja (PAR). Z analizami je bilo ugotovljeno, da metodi hemisferičnega fotografiranja in merjenja fotosintetskega aktivnega sevanja PAR v obdobju z listjem podcenjujeta vrednosti LAI. Dobljeni vrednosti za LAI po metodi zbiranja listja sta 6,7 za južno pobočje in 7,3 za severno. Manjša vrednost LAI na južnem pobočju je bila pričakovana, saj ima gozd na tem pobočju bolj odprt značaj kot na severni strani.

• Language: Slovenian
• Keywords: vegetacija, listna površina, gozdna hidrologija, Dragonja
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publisher: Univerza v Ljubljani, Fakulteta za gradbeništvo in geodezijo
• Year: 2004
• Number of pages: Str. 1-15
• Numbering: 22, [št.] 36
• PID: 20.500.12556/RUL-32186
• ISSN: 0352-3551
• UDC: 556.52:630*1(497.4)
• COBISS.SI-ID: 232251392
• Publication date in RUL: 10.07.2015

Secondary language

• Language: English
• Title: Estimating leaf area index of the deciduous forest in the Dragonja watershed

Abstract

Measurements and estimation of leaf area index (LAI) were carried out in the deciduous forest in the experimental watershed of the Dragonja River. At the same time precise measurements and analysis relevant to single elements of the forest hydrological cycle and other vegetational parameters with modern measuring equipment were made. In Part 1 of the paper (Šraj, 2003b) the methods of delineation of the leaf area index and measurements of LAI were discussed. An accurate description of characteristical features of trees on both chosen plots was also given. In this part of the paper, results of measurements, LAI estimation and analysis are given. The measurements commenced in autumn 2000. The specific leaf area (SLA) was estimated for the most abundant tree species (for example oak, ash, hornbeam, maple, cornelian cherry dogwood). Leaf area index was estimated according to three methods: direct method of litterfall collection, method of hemispherical photography, and method of measuring photosynthetically active radiation (PAR). The analyses revealed that the methods of hemispherical photography and of photosynthetically active radiation (PAR) underestimated the value of LAI in the full-leaf period. LAI estimated according to the litterfall collection method was 6.7 on the south plot and 7.3 on the north plot. The lower value of LAI on the south plot was expected, since the forest on the south plot has a more open character than the one on the north plot.