Abstract
The aim of the study is to analyse the productive potential of grey alder (Alnus incana (L.) Moench) along an altitudinal gradient to verify coincidence ofproductive and ecological optimum and to identify climatic factors that control the growth. Along the altitudinal gradient of the river basin, dendrometric data has been analysed on the eight permanent research plots at the altitude of 525–705m. Correlations between standard chronology and average monthly climate characteristics were calculated for the period 1969–2015. Significant differences in the average basal area increments have been recognized among the investigated altitudinal zones. The highest basal area increment (1661±975mm<sup>2</sup>y<sup>-1</sup>) was detected in the zone of altitude 605m. and the average annual volume increment of the model grey alder stand was 4.59m<sup>3</sup>. The radial growth of grey alder has been positively affected only by the temperature of the current April and negatively by precipitation of the previous growing season. Based on the pointer year analysis can be claimed that condition of the root system is the most influential factor in relation to the radial growth and is dependent on water stress in the previous year. Investigated relationships may significantly influence decision making process in the forest management focused on grey alder re- or afforestation.
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