Hydraulic and mechanical properties of young Norway spruce clones related to growth and wood structure.

摘要: Stem segments of eight five-year-old Norway spruce (Picea abies (L.) Karst.) clones differing in growth characteristics were tested for maximum specific hydraulic conductivity (k(s100)), vulnerability to cavitation and behavior under mechanical stress. The the was assessed by measuring applied air pressure required cause 12 50% loss (Psi(12), Psi(50)) percent at 4 MPa (PLC(4MPa)). bending strength stiffness axial compression same stem measured characterize wood properties. Growth ring width, density, latewood percentage, lumen diameter, cell wall thickness, tracheid length pit dimensions earlywood cells, spiral grain microfibril angles examined identify structure-function relationships. High k(s100) strongly positively related angle, which corresponded dimensions. Spiral may reduce flow resistance bordered pits first tracheids, are characterized rounded tips an equal distribution along entire length. Wood density unrelated parameters. Traits associated with higher long high percentage thick walls. positive relationship between thickness suggest that seeding through margo occur earlywood. There a phenotypic genotypic PLC(4MPa), both parameters tree rate. Variability properties depended mostly on but also amount wood. Accordingly, or showed no tradeoff.