Variation of heartwood proportion and leachability in plantation grown teciona crandis l. f.
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Date
1988
Authors
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Publisher
Sokoine University of Agriculture
Abstract
The age at which heartwood starts to form in Tectona grandis L.f.,
the relationship between some stem parameters and heartwood
proportion, heartwood anatomy and chemical aspects were studied.
Sample trees
for determination of age at which heartwood starts to
form were obtained from 5, 6, 7, 8, 9 and 10 year old stands.
For the determination of heartwood proportion and its variation with
age, dbh, total tree height and height in the stem, heartwood
acidity and leachability,sample trees from 7, 11, 16, 21 and 25 year
old stands and from 32 and 50 year old trial plots were used.
It
was found that heartwood started to form when the trees are between
7 to 9 years old.
It was also observed chat :
heartwood proportion increased asymptotically with increase in age;
heartwood proportion increased asymptotically with increase in dbh;
heartwood proportion increased asymptotically with increase in
total tree height for 11, 21 and 25 year old trees;
heartwood proportion increased with increase in dbh and total tree
height considered together;
heartwood proportion decreased with increase in height in the stem;
An average heartwood pH of 5.5 was obtained from 25 year old trees.
Within a period of 30, 60, 90 and 120 days heartwood sample pieces soaked
in cold water lost 0.05%, 0.11%, 0.19% and 0.21% by weight respectively.
A loss of 0.07%, 0.16%, 0.27% and 0.5% by weight occurred for hot water
leaching for 24, 43, 72 and 96 hours respectively.
These losses were not significant at 95% confidence level.
Description
Masters Theses
Keywords
Heartwood proportion, Leachability-plantation grown, Tectona grandis L.f.