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Comparison of four methods for estimating relative solar radiation in managed and old-growth silver fir-beech forest
Roženbergar, Dušan (Author), Kolar, Uroš (Author), Čater, Matjaž (Author), Diaci, Jurij (Author)

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Abstract
Methods based on the principle of hemispherical canopy projection, including hemispherical photography (digital andfilm), sensors like LAI 2000 (zenith cutoff anle 74,1°) andstable horizontoscope, represent less accurate, yet significantly less expensive andtime-consuming techniques for radiation measurements comparedto long-term measurement with a network of photosynthetically active radiation (PAR) sensors. With measurements taken at a single point in time they can provide reliable estimates of relative diffuse anddirect solar radiation andcan also be usedto estimate the light climate in different times of the year. The four above mentioned methods for solar radiation estimation were applied at the same points in gaps and under adjacent canopies in unevenaged, mixed Dinaric fir-beech and pure beech montane forests. Locations covereda range of radiation andstandstructure conditions. Data analyses showedgoodreliability of all four methods over the whole range (2–80%) of radiation conditions. The most comparable results come from LAI 2000 andfilm hemispherical photography (all R > 0.90). Digital hemispherical photography is an accurate andreliable (R = 0.89) replacement for film hemispherical photography, but the higher values estimatedfor direct radiation should be taken into account. Compared to the other three methods, the stable horizontoscope gives less accurate results, especially under canopies with poorly defined gaps. Our study showed that all four methods tested are suitable for estimating the solar radiation climate in gaps and stands with heterogeneous vertical structures, andhave potential value as a tool in decision making when practicing silviculture.

Language:English
Keywords:male gozdne posesti, svetlobne razmere, gojenje gozdov
Work type:Scientific work (r2)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2011
Publisher:Bogucki Wydawnictwo Naukowe
Number of pages:str. 73-82
Numbering:Vol. 65, no. 1
UDC:630*22
ISSN on article:1641-1307
COBISS.SI-ID:3175846 Link is opened in a new window
Views:513
Downloads:23
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Record is a part of a journal

Title:Dendrobiology
Shortened title:Dendrobiol.
Publisher:Bogucki Wydawnictwo Naukowe.
ISSN:1641-1307
COBISS.SI-ID:1506726 This link opens in a new window

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