Dynamics of radial increments of oak due to climatic factors effect
2007
Petráš, R., Lesnícky výskumný ústav, Zvolen (Slovak Republic) | Brezina, L., Technical University in Zvolen (Slovak Republic). Faculty of Forestry | Mecko, J., Lesnícky výskumný ústav , Zvolen (Slovak Republic)
Dynamics of radial increments in the growth process of sessile oak trees in dependence on climatic factors was studied in the work. There was selected oak stand, in Central Slovakia, about 5 km to the south-west from climatic station Sliač, where increments probes were taken from 25 trees. All orders of annual rings were synchronized and dated. From absolute increments there were calculated increment indexes as their proportions to equalled age increment trend. This trend was derived by two ways - regression equalling according to fluent mathematical function and as moving averages. Correlation analysis was used for detailed examination of the effect of average monthly temperatures and monthly precipitation totals on increment indexes of trees. The results show that increment indexes calculated from moving averages are more suitable for studying the effect of climatic factors in increments. For 60% of studied trees statistical test confirmed significant positive linear dependence of increment indexes on monthly precipitation totals in vegetation months May until July. Significant positive correlation dependence on spring and late summer monthly temperatures is only for 4-8% of trees. At the same time this dependence is negative for about the same number of trees.
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