Detailed Information on Publication Record
2014
Diurnal changes in photosynthetic activity of the biological soil crust and lichen: Effects of abiotic factors (Petuniabukta, Svalbard)
SEHNAL, Luděk, Miloš BARTÁK and Peter VÁCZIBasic information
Original name
Diurnal changes in photosynthetic activity of the biological soil crust and lichen: Effects of abiotic factors (Petuniabukta, Svalbard)
Name in Czech
Denní změny fotoszntetické aktivity biologické půdní krusty a lišejníku: Vliv abiotických faktorů (Zátoka Petunia, Špicberky)
Authors
SEHNAL, Luděk (203 Czech Republic, guarantor, belonging to the institution), Miloš BARTÁK (203 Czech Republic, belonging to the institution) and Peter VÁCZI (703 Slovakia, belonging to the institution)
Edition
Czech Polar Reports, Masarykova univerzita, 2014, 1805-0689
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10600 1.6 Biological sciences
Country of publisher
Czech Republic
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
RIV identification code
RIV/00216224:14310/14:00079515
Organization unit
Faculty of Science
Keywords (in Czech)
Špicberk; lišejník; biologická půdní krusta; photosyntéza; fluorescence; effektivní kvantový výtěžek; Cladonia rangiferina; Nostoc sp.
Keywords in English
Spitsbergen; lichen; biological soil crusts; photosynthesis; fluorescence; effective quantum yield; Cladonia rangiferina; Nostoc sp.
Tags
Reviewed
Změněno: 28/4/2015 09:54, Ing. Andrea Mikešková
V originále
In polar ecosystems, primary producers have to cope with a very harsh climate that limits the time available for growth and biomass production. In this study, diurnal measurement of photosynthetic processes in biological soil crust and a lichen were carried out in Petuniabukta, Spitsbergen. For field measurements, a method of induced fluorescence of chlorophyll was used. Measurements of photosynthetic activity were taken as repetitive measurements of effective quantum yield of photosystem II (PhiPSII). The short-term field measurements were carried out for 10 days in summer 2014. PhiPSII was recorded each 5 minutes as well as microclimatic data (air temperature, air humidity, photosynthetically active radiation - PAR). The microclimatic parameters were recorded by a datalogger. In general, physiological activity of both biological soil crust and a lichen showed daily courses. Tested lichen was Cladonia rangiferina and the most dominant species in biological soil crust was Nostoc sp. Typically, most of PhiPSII values ranged 0.6 – 0.7 in both model organisms. The results have shown that photosynthetic activity was strongly correlated with all observed abiotic factors in both study objects. Particularly important was the relation found between PAR and PhiPSII in biological soil crust. When the biological soil crust was exposed to high PAR doses of irradiation (about 2300 micromol m-2 s-1) photoinhibition of primary processes of photosynthesis was observed as PhiPSII decrease, while photosynthetic activity of lichen remained at same level. Furthermore, it has been demonstrated increasing that in situ photosynthetic activity increased in both biological soil crust and lichen with a decrease in temperature.
In Czech
Byly sledovány primární fotoszntetické procesy biologické půdní krusy a lišejníku. Studie byla uskutečněna v terénu na Špicberkách.
Links
| LM2010009, research and development project |
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