Meritve sončnega sevanja v gozdu : II. Metode na osnovi projekcij hemisfere neba in krošenj

Diaci, Jurij (author), Thormann, Jean-Jacques (author), Kolar, Uroš (author)

Poznavanje porazdelitve sevanja v gozdu je pomembno za temeljna ekološka proučevanja in za prakso gojenja gozdov. V članku primerjamo tri metode ocenjevanja sončnega sevanja na osnovi preslikave svoda neba in krošenj: fotografijo hemisfere z objektivom "ribje oko", horizontoskop in LAI-2000 Plant Canopy Analyzer. Prikazujemo izkušnje, izboljšave metod ter načrt za podstavek horizontoskopa, ki smo ga razvili na Katedri za gojenje gozdov. Izboljšani stabilni horizontoskop daje, z nekaterimi omejitvami, povsem zadovoljive rezultate za neposredno gojitveno delo. Fotografija hemisfere je primerna za oceno svetlobnih razmer v vseh tipih sestojev in je zato uporabna pri raziskovalnem delu. V zadnjem času se metoda intenzivno razvija. Digitalizacija celotnega sistema bo pospešila standardizacijo. Instrument LAI-2000 je posebej primeren za raziskave pomlajevanja v razmerah bujne zeliščne vegetacije na bogatih rastiščih in v spremenjenih sestojih.

• Language: Slovenian
• Keywords: sončno sevanje, meritve sevanja, gojenje gozda, fotosinteza, fotosintetsko aktivno sevanje, fotosintetsko uporabno sevanje, pretok energije, gozd, fotografija, hemisfera, horizontoskop, direktno sevanje, difuzno sevanje
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Year: 1999
• Number of pages: Str. 177-210
• Numbering: Št. 60
• PID: 20.500.12556/RUL-64361
• UDC: 630
• ISSN on article: 0351-3114
• COBISS.SI-ID: 605094
• Publication date in RUL: 10.07.2015

Record is a part of a journal

• Title: Zbornik gozdarstva in lesarstva. forest and wood science & technology
• Shortened title: Zb. gozd. lesar.
• Publisher: Gozdarski inštitut Slovenije, Biotehniška fakulteta, Oddelek za gozdarstvo in obnovljive gozdne vire, Biotehniška fakulteta, Oddelek za lesarstvo
• ISSN: 0351-3114
• COBISS.SI-ID: 6206978

Secondary language

• Language: English
• Title: Solar radiation measurements in forests : II. Methods based on the principle of hemispherical photography

Abstract

The know-how in the field of solar radiation distribution in forests is important for basic ecological investigations and silvicultural practice. Three methods of solar radiation assessment based on hemispherical canopy photography are compared in the present article: a hemispherical photography by means of a fish-eye lens, a horizontoscope and the ALI-2000 Plant Canopy Analyzer. Experiences, improved methods and a drawing of a horizontoscope stand which was elaborated at the Chair of Silviculture are presented. Fairly good results with some limitations can be achieved with the improved stable horizontoscope in silvicultural work. Hemispherical photography is appropriatefor the assessment of light conditions in all stand types and can thus be used in research work. The method has recently been undergoing intensive development. Digitalization of the entire system will speed up standardization. The ALI-2000 instrument is highly suitable for regeneration research in conditions of abundant plant vegetation, in reach sites and modified stands.

• Keywords: solar radiation, radiation measurement, silviculture, photosynthesis, photosynthetically active radiation, photosynthetically usable radiation