RT Journal Article SR Electronic A1 Gryc, Vladimír A1 Horáček, Petr T1 Resin canals in spruce (Picea abis /L./ Karst.) with the occurrence of reaction wood JF Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis YR 2014 VO 53 IS 1 SP 85 OP 92 DO 10.11118/actaun200553010085 UL https://acta.mendelu.cz/artkey/acu-200501-0010.php AB The paper was aimed at the determination of variability of horizontal resin canal dimension in spruce wood in relation to the position in a spruce stem. Significant changes of dimensions in horizontal resin canal along the stem length and radius were found. On the basis obtained of results 3D models (for CW, OW, SWL and SWP zones) describing changes in resin canal dimensions in spruce in relation to the position in a stem were created. In the models, the resin canal dimension decreases with the height of a stem and on the other hand, with an increasing distance from the stem pith the dimension of resin canal increases. The importance of the paper consists in the enlargement of findings about the structure of spruce with compression wood.