The Seedling Behaviour within a Tree Arrangement Station under Low Temperature Recorded Due to Late Frost

Within new established tree nurseries, for development of young trees in the early years, the determining factor is their ability to resist deviations from normal climatic elements. It is known that beach young trees have poor resistance to extremes of climatic variations. The aim of our research is to identify the main particularities of the seedlings behavior within accidental low temperature determined by changes occurred in climatic conditions. Observations were performed, during a three years period, 1996 - 1998, from April to the end of May, in 4 units located on the plateau areas of Sovata Forestry Office, in order to record negative temperatures that could affect the seedlings regeneration. The lowest temperatures were 1.1 0C during the night of 22/23 May and 3.0 0C during the night of 23/24 May, 1998. In all four analyzed units located in the vicinity of the mountaintop, beech seedlings were less affected by the late frost. Until fall 1998, a rate of 10 - 12% of affected seedlings was dry, the rest having changes more or less accentuated. As a result of late frost reported in the end of May 1998, 10 - 20% of seedlings were injured.