THE ANALYSIS OF RADIAL GROWTH IN STEM OF NORWAY SPRUCE BYMEANS OF DIFFERENT METHODS AND ASSESSMENT OF EFFECT OF CLIMATIC CONDITIONS IN RELATION TO THE GROWTH

摘要

The study focused on the description of xylem formation in Norway Spruce at the cellular level during 2009-2010 in the area of the Drahanska (vrchovina) Upland. Samples were regularly extracted from the research sites in two growing seasons and the number of newly formed and differentiating cells was established for 30-31 year-old trees and 105-106 year-old trees. The results were used for the description of the dynamics of the growth of trees of different ages. Further, we evaluated the effect of selected climatic factors on cellular growth, based on the differences of the effect of the sum of active temperatures with respect to the age of trees and the changes in the effect of temperatures during the growing season. The second evaluated climatic factor was soil moisture. In addition, the differences between the time series obtained from dendrometers and those obtained from counting of newly formed cells were analysed. The evaluation of the changes in the effect of the sum of active temperatures on cell formation during the season revealed that the temperatures in the second half of June and the first half of July are of the highest significance. The examination of the effect of temperatures on cell formation confirmed that temperatures have a higher effect on cell formation with a 14-day delay.