20.500.12556/RUL-64361 Meritve sončnega sevanja v gozdu II. Metode na osnovi projekcij hemisfere neba in krošenj Solar radiation measurements in forests II. Methods based on the principle of hemispherical photography 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. 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. sončno sevanje meritve sevanja gojenje gozda fotosinteza fotosintetsko aktivno sevanje fotosintetsko uporabno sevanje pretok energije gozd fotografija hemisfera horizontoskop direktno sevanje difuzno sevanje solar radiation radiation measurement silviculture photosynthesis photosynthetically active radiation photosynthetically usable radiation true false false Slovenski jezik Angleški jezik Neznano 2015-07-10 19:51:48 2015-07-10 19:51:48 2024-08-09 03:46:42 0000-00-00 00:00:00 1999 0 0 Str. 177-210 Št. 60 1999 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630 0351-3114 605094 6206978 zbgl-60-6.pdf zbgl-60-6.pdf 1 51EEE84F992A8FA059CA10238E3CCEEB 59e92c9e84143618251af4bb346e9665baba08d7affa6a28e40cd3d0a08e37ac 627fee28-a1b3-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=100749 Biotehniška fakulteta 0 0 0