Seasonal variability of photosynthetically active radiation incident on vegetation cover at Vernadsky Station, Galindez Island, Antarctica

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Authors	LÁSKA Kamil BARTÁK Miloš PROŠEK Pavel NAKALOV Evgenyi MILINEVSKY Gennadi
Year of publication	2005
Type	Article in Proceedings
Conference	PHOTOSYNTHESIS AND STRESS, Biophysical and Biochemical methods in Photosynthesis Research
MU Faculty or unit	Faculty of Science
Citation
Field	Atmosphere sciences, meteorology
Keywords	Antarctic oases; microclimate; global solar radiation; PAR; snow cover; moss carpets; lichens;
Description	The possible effect of light regime on physiologically active time of moss and lichens cover was evaluated with using of PAR, global solar radiation, surface and soil temperature data at the both stands. The daily sums of the incoming solar radiations fluctuated greatly according to changes in the weather conditions, and essentially replicated the high variability of the cloudiness. During the summer season (October - March) was determined 57 days with the PAR values higher than 1500 umol.m-2.s-1 and only 13 days with the PAR values exceeded the level of 2000 umol.m-2.s-1. The PAR of 2000 umol.m-2.s-1 and higher often occurred for short-time interval of 10 or 20 min within a day. Only in one case (17 December), the level of 2000 umol.m-2.s-1 had a duration over 40 min. Due to PAR reflection from episodic snow deposition on the vegetation surface during summer season, the true number with high PAR incident on the lichens and mosses was reduced.
Related projects:	Ecology of the coastal vegetation