Acta Univ. Agric. Silvic. Mendelianae Brun. 2013, 61(1), 129-135 | DOI: 10.11118/actaun201361010129

Transmittance of young Norway spruce stand canopy for photosynthetically active radiation during the growing season

Irena Marková1, Jiří Kubásek2
1 Institute of Forest Ecology, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic
2 Global Change Research Centre AS CR, v.v.i., Laboratory of metabolomic and isotopic analyses, Bělidla 4a, 603 00 Brno, Czech Republic

Analysis of transmittance of young Norway spruce stand canopy for photosynthetically active radiation (PAR) was made at the study site of Bílý Kříž (the Moravian-Silesian Beskids Mts., the Czech Republic) at different sky conditions during the growing season in 2010. For the description of PAR transmittance different phenological phases of the spruce stand development in clear and overcast days were chosen. The mean daily PAR transmittance of the spruce canopy was significantly higher in overcast days compared with clear ones. Diffuse PAR thus penetrated into lower parts of the canopy more efficiently than direct one. PAR transmittance of young Norway spruce stand canopy was different in individual phenological phases of the spruce stand canopy which was caused by changes in the stand structure during the growing season. Thus monitoring of transmittance of young Norway spruce stand canopy for PAR can help to describe the development of spruce stand canopy.

Keywords: overcast and clear days, phonological phases
Grants and funding:

The authors are grateful for the financial support by grant No. MSMT 6215648902 of the Ministry of Education, Youth and Sports of the Czech Republic and by grant No. CZ.1.07/2.4.00/31.0056 of the Ministry of Education, Youth and Sports of the Czech Republic. The study site of Bílý Kříž is within the National Infrastructure for Carbon Observations - CzeCOS / ICOS supported by Ministry of Education of the Czech Republic (LM2010007).

Received: June 22, 2012; Published: April 8, 2013  Show citation

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Marková, I., & Kubásek, J. (2013). Transmittance of young Norway spruce stand canopy for photosynthetically active radiation during the growing season. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 61(1), 129-135. doi: 10.11118/actaun201361010129
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