Comparison of four methods for estimating relative solar radiation in managed and old-growth silver fir-beech forest

• Autorzy: Rozenbergar D. , Kolar U. , Cater M. , Diaci J.
• Języki publikacji: EN

Abstrakty

EN

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 andd irect 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.

Słowa kluczowe

EN

solar radiation; old-growth silver fir forest; beech forest; forest; light condition; forestry; hemispheric photography

• Wydawca: -
• Czasopismo: Dendrobiology
• Rocznik: 2011
• Tom: 65
• Opis fizyczny: p.73-82,fig.,ref.

Twórcy

autor

Rozenbergar D.

• Department for Forestry and Renewable Forest Resources, Biotechnical Faculty, University of Ljubliana, Vecna pot 83, 1000 Ljubliana, Slovenia

autor

Kolar U.

autor

Cater M.

autor

Diaci J.

Bibliografia

• Anderson M.C. 1971. Radiation and crop structure. In: Plant photosynthesis production. Manual of methods. Sestak Z. et al. (eds.). Junk, Hague, pp. 412–466.
• Boncina A., Diaci J., Cencic L. 2002. Comparison of the two main types of selection forests in Slovenia: distribution, site conditions, stand structure, regeneration andmanagement. Forestry 75: 365–373.
• Brang P. 1998. Early seedling establishment of Picea abies in small forest gaps in the Swiss Alps. Canadian Journal of Forest Research 28: 626–639.
• Brunner A. 2002. Manual: Hemispherical photography and image analysis with hemIMAGE and Adobe Photoshop (15-09-2002). Danish Forest and Land scape Research Institute, Denmark, 1–15.
• Brunner A., Huss J. 1994. The development of artificially regeneratedspecies of the mixed mountain forest in the Eastern Bavarian Alps. Forstwissenschaftliches Centralblatt 113: 194–203.
• Cescatti A. 2007. Indirect estimates of canopy gap fraction basedon the linear conversion of hemispherical photographs – Methodology and comparison with standard thresholding techniques. Agricultural and Forest Meteorology 143: 1–12.
• Cieslar A. 1904. Die Rolle des Lichtes im Walde. Mitteilungen aus dem forstlichen Versuchswesen Österreichs 30: 1–105.
• Comeau P.G., Gendron F., Letchford T. 1998. A comparison of several methods for estimating the light under a paper birch mixewood stand. Canadian Journal of Forest Research 28: 1843–1850.
• Diaci J. 1999. Meritve soncnega sevanja v gozdu – I. presoja metodin instrumentov = Solar radiation measurements in forests- I. evaluation of methods and instruments. Zbornik Gozdarstva in Lesarstva 58: 105–138.
• Diaci J., Thormann J. J., Kolar U. 1999. Meritve sonènega 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. Zbornik Gozdarstva in Lesarstva 60: 177–210.
• Diaci J., Kolar U. 2000. Umerjanje objektiva „ribje oko“ za fotografijo hemisfere. Zbornik Gozdarstva in Lesarstva 61: 5–25.
• Diaci J. 2002. Regeneration dynamics in a Norway spruce plantation on a silver fir-beech forest site in the Slovenian Alps. Forest Ecology and Management 161: 27–38.
• Diaci J., Thormann J. J. 2002. Ein Vergleich verschiedener Lichtmessmethoden in Buchennaturwäldern Sloweniens aus verjüngungs-ökologischer = A comparison of solar radiation estimation methods in natural beech forests in Slovenia from the point of view of ecological regeneration. Schweizerische Zeitschrift fur Forstwesen 153: 39–50.
• Diaci J., Pisek R., Boncina A. 2005. Regeneration in experimental gaps of subalpine Picea abies forest in Slovenian Alps. European Journal of Forest Research 124: 29–36.
• Dohrenbusch A., Kranigk J., Pryor, D. 1995. Entwicklung undBau eines Lichtmessgerätes zur Erfassung der photosynthetisch nutzbaren Strahlung. Allgemeine Forst undJagd zeitung 166: 154–160.
• Easter M.J., Spies T.A. 1994. Using hemispherical photography for estimating photosynthetic photon flux density under canopies and in gaps in Douglas-fir forests of the Pacific Northwest. Canadian Journal of Forest Research 24: 2050–2058.
• Evans G.C., Coombe D.E. 1959. Hemispherical and woodland canopy photography and the light climate. Journal of Ecology 47: 103–113.
• Frazer G.W., Fournier R.A., Trofymow J.A., Hall R.J. 2001. A comparison of digital and film hemispherical photography for analysis of forest canopy structure andgap light transmission. Agricultural and Forest Meteorology 109: 249–263.
• Frehner M. 1989. Beobachtungen zur Einleitung der Naturverjüngung an einem nordexponierten Steilhang im subalpinen Fichtenwald. Schweizerische Zeitschrift fur Forstwesen 140: 1013–1022.
• Gatch J.A., Harrington T.B., Castleberry J.P. 2002. LAI-2000 Accuracy, Precision, andApplication to Visual Estimation of Leaf Area Index of Loblolly Pine. Gen. Tech. Rep. SRS–48. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station, pp. 77–78.
• Gendron F., Messier C., Comeau P.G. 1998. Comparison of various methods for estimating the mean growing season percent photosynthetic photon flux density in forests. Agricultural and Forest Meteorology 92: 55–70.
• Gonsamo A., Pellikka P. 2008. Methodology comparison for slope correction in canopy leaf area index estimation using hemispherical photography. Forest Ecology and Management 256: 749–759.
• Gower S.T., Norman J.M. 1991. Rapidestimation of leaf area index in conifer and broad-leaf plantations. Ecology 72: 1896–1900.
• Hale S.E., Edwards C. 2002. Comparison of film and digital hemispherical photography across a wide range of canopy densities. Agricultural and Forest Meteorology 112: 51–56.
• Hyer E.J., Goetz S.J. 2004. Comparison and sensitivity analysis of instruments andrad iometric methods for LAI estimation: assessments from a boreal forest site. Agricultural and Forest Meteorology 122: 157–174.
• Imbeck H., Ott E. 1987. Verjüngungsökologische Untersuchungen in einem hochstaudenreichen subalpinen Fichtenwald, mit spezieller Berücksichtigung der Schneeablagerung. Mitteilungen des Eidgenössischen Institutes für Schnee- und Lawinenforschung 42: 1–202.
• Inoue A., Yamamoto K., Mizoue N., Kawahara Y. 2004. Effects of image quality, size andcamera type on forest light environment estimates using digital hemispherical photography. Agricultural and Forest Meteorology 126: 89–97.
• Jonckheere I., Fleck S., Nackaerts K., Muys B., Coppin P., Weiss M., Baret F. 2004. Review of methods for in situ leaf area index determination – Part I. Theories, sensors andhemispherical photography. Agricultural and Forest Meteorology 121: 19–35. Jonckheere I., Nackaerts K., Muys B., Coppin P. 2005. Assessment of automatic gap fraction estimation of forests from digital hemispherical photography. Agricultural and Forest Meteorology 132: 96–114.
• Lang M., Kuusk A., Mottus M., Rautiainen M., Nilson T. 2010. Canopy gap fraction estimation from digital hemispherical images using sky radiance models and a linear conversion method. Agricultural and Forest Meteorology 150: 20–29.
• Larcher W. 1983. Physiological plant ecology. Springer- Verlag, München, pp 1–303.
• Lieffers V.J., Messier C., Stadt K.J., Gendron F., Comeau P.G. 1999. Predicting and managing light in the understory of boreal forests. Canadian Journal of Forest Research 29: 796–811.
• LI-COR 1992. LAI-2000 Plant Canopy Analyzer (Operating manual). LI-COR Inc., 1–14.
• Machado J.L., Reich P.B. 1999. Evaluation of several measures of canopy openness as predictors of photosynthetic photon flux density in deeply shaded conifer-dominated forest understory. Canadian Journal of Forest Research 29: 1438–1444.
• Mlinšek D. 1972. Ein Beitrag zur Entdeckung der Postojna Kontrollmethode in Slowenien. Forstwissenschaftliches Centralblatt 91: 291–296.
• Nobis M., Hunziker U. 2005. Automatic thresholding for hemispherical canopy-photographs basedon edge detection. Agricultural and Forest Meteorology 128: 243–250.
• Poulson L.T., Platt W.J. 1989. Gap light regimes influence canopy tree diversity. Ecology 70: 553–555.
• Regent Instruments 2003. WinSCANOPY for hemispherical image analysis. Manual. 1–104.
• Rich P.M., Clark D.B., Clark D.A., Oberbauer S.F. 1993. Long-term study of solar radiation regimes in a tropical wet forest using quantum sensors and hemispherical photography. Agricultural and Forest Meteorology 65: 107–127.
• Runkle J.R. 1982. Patterns of disturbance in some old-growth mesic forests of eastern north America. Ecology 63: 1533–1546.
• Schütz J.-Ph., Brang P. 1995. L’horizontoscope: Un Étonnant Outil Pratique De Sylviculture, Notamment En Haute Montagne. ONF (Office National des Forets) – Bulletin Technique 28: 1–7.
• Tonne F. 1954. Besser bauen mit Besonnungs- und Tageslicht- planung. Verlag Karl Hofmann, Stuttgart, 1–41.
• Wagner S. 1996. Übertragung strahlungsrelevanter Wetterinformation aus punktuellen PAR-Sensordaten in grössere Versuchsflächenanlagen mit Hilfe hemisphärischer Fotos. Allgemeine Forst und Jagdzeitung 167: 34–40.
• Welles J.M., Norman J.M. 1991. Instrument for indirect measurement of canopy architecture. Agronomy Journal 83: 818–825.