Basic density and tracheid length in juvenile and mature wood in pinus patula from southern Tanzania
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Date
1984
Authors
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Publisher
Sokoine Univesrity of Agriculture
Abstract
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.
Description
PhD Theses
Keywords
Forestry, Wood dentisty, Forestry Agriculture