Burst phenology and birch bud resistance to frost
2000
Kula, E. (Mendel University of Agriculture and Forestry, Brno (Czech Republic). Faculty of Forestry and Wood Technology)
In connection with mass burst failure of the birch Betula pendula (Roth) 1997 in the Ore Mts (North Bohemia), the burst phenology, depending on the sum of effective temperatures, and effects of low temperatures on buds after atypical warming and subsequent frosts (-1.9 to -10.4 degree C) during the winter period (9.2.-4.3.1998) were investigated. The birch responded by growth activities in buds at the sum of effective temperatures of 31 degree C, subsequent cooling with the minimum temperature of -10 degree C only stopped the growth bud did not damage buds. If the birch is not exposed to other stress factors disturbing the bud physiology, it is a tree sort resisting well to temperature unusual fluctuations during the winter and late frosts
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