The graduation thesis deals with Norway spruce (Picea abies (L.) Karst.), namely with its beginning, end and duration of cambium production as well as the individual phases of tree ring formation on two sites on Panška reka (400 m. a. s. l.) and Menina planina (1200 m. a. s. l.). At the first site six trees samples have been analysed, and at the second nine. Specimens (microcores) were extracted from living trees by using Trephor tool in 2009 in weekly intervals between 16th March and 28th September on Panška reka, and between 24th April and 25th September on Menina planina. After extraction they were embedded in paraffin by means of a tissue preparator. From microtome samples, cross section slices were produced and stained with safranin red and astra blue. Sections were analysed with a light microscope (Nikon Eclipse E800), using the camera to show image on a computer screen. Specimens were microscopically analysed (measuring and counting wood cells) along three radial series. Acquired data wereinserted in Excel programme, then statistical and graphical data analyses were carried out. Results showed that beginnings, ends and duration of individual phases of ring tree growth were different. Vegetation period started earlier and finished later in trees growing on low elevation site Panška reka than in trees growing on high elevation site of Menina Planina.
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