Browsing by Author "Ringo,Winnyston n-jilekiro"

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Basic density and tracheid length in juvenile and mature wood in pinus patula from southern Tanzania
(Sokoine Univesrity of Agriculture, 1984) Ringo,Winnyston n-jilekiro
Variations in basic density and tracheid length were investigated on wood samples from 27 year old Pinus patula trees grown in Sao Hill, Southern Tanzania. The main objectives of the study were: - to verify variations between and within trees to determine juvenile period and juvenile wood proportion in the stems - to elucidate variations between and within juvenile and mature wood - to relate juvenile wood basic density and tracheid length with those in mature wood. Fifteen sample trees were randomly selected in two similar compartments in Msiwazi sub-management block. 2.5 cm thick disks were extracted from each sample tree at 1.3 m, 4 m, 8 m and 12 m heights. Based on results from a preliminary investigation, data for the following variables were obtained for each second ring from pith to bark following one cardinal direction in each: - ring distance from pith - ring width - latewood band width - ring basic density - earlywood and latewood basic densities - earlywood and latewood tracheid lengths Basic density was computed from oven dry weight and green volume. Tracheid length was measured by the projection technique. Earlywood and latewood tracheid lengths were obtained separately as the mean length of 30 unbroken tracheids. The average of the early wood and latewood tracheid lengths constituted the ring tracheid length.