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Net radiation of mountain cultivated Norway spruce [Picea abies (L.) Karst.] stand: evaluation of short- and long-wave radiation ratio

100%

Markova I. , Marek M. V.

nr 2

The radiation exchange drives the plant ecosystems energy balance and provides the energy for photosynthesis, transpiration and plant growth. The investigation on net radiation and its component during vegetation season in relation to the clearness index and sun elevation in a cultivated 31-year-old mountain spruce [Picea abies (L.) Karst.] stand is presented. Downward short-wave radiation – Sd (incident on the spruce stand was the main part of the short-wave radiation balance during the whole growing season (April–October) 2008. The Sd a mount i s seasonally variable factor determined by the duration of solar shine and the atmosphere transmissivity. Obtained value of net radiation (Rn) and downward short-wave radiation (Sd) ratio amounts to 0.61 on average during the growing season 2008 documenting the importance of the downward short-wave radiation in the net radiation of investigated spruce stand.

Orthotrichum affine var. bohemicum (Orthotrichaceae), a new variety of epiphytic moss from the Czech Republic

80%

Plasek V. , Sawicki J. , Markova I. , Wierzcholska S.

2011

tom 80

nr 4

Orthotrichum affine var. bohemicum Plášek & Sawicki, var. nova, is a confirmed record of a new variety from the Czech Republic. The new taxon is described and illustrated by photos and drawing. It is characterized by having superficial stomata and a peristome with 16 endostome segments (practically as long as exostome teeth). Molecular data indicating the phylogenetic placement of the species are presented.