Výsledky fenologické studie u mladého smrku ztepilého (Picea abies /L./ Karst.)

Abstract

The paper deals with results of phenological studies of Norway spruce (Picea abies/L./ Karst.) in a mixed stand. This broad range was important in spring phenological stages. High correlations were determined between the mean air temperature, soil temperature and the start of phenological stages. Relationships between the onset of phenological stages and changes in meteorological parameters were expressed by the sum of effective air temperatures exceeding 0 and 5 °C. To evaluate the relationships by means of the sum of effective temperatures >5 °C, the stage of budbreak was most important.The onset of budbreak in Norway spruce occurred on average in the 125th day in the period 2005 to 2008. First, the stage of budbreak in spruce began the 121st day and at the latest the 128th day in 2005. The most often budbreak was in 2007. The onset of foliage in spruce began between the 128th day and the 136th day. Full 100% foliage occurred in 2007, viz. the 159th day, i.e. 12 day earlier than in the previous year. In 2005, full foliage occurred the 171st day. The air and soil temperatures affected spring phenological stages during the early spring, which was demonstrated by high correlation coefficients.