Effects of thinning regimes on growth and yield of tectona grandis at Longuza forest plantation, Muheza district, Tanzania
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Date
2022
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Publisher
Tanzania Journal of Forestry and Nature Conservation
Abstract
Thinning regime implies stands thinned at
successive intervals, type, and intensity
influencing growth and yield. Teak Forests
in Tanzania are the main source of hardwood
raw materials however thinning operations
are not properly implemented. The purpose
of this study was to determine whether
thinned stands could impair the eventual
projected growth and yield. Growth and
yield data were collected from 168
purposively selected circular plots of radius
9.78 m distributed systematically in 9
thinned compartments in three thinning
regimes. Thinning history, tree diameter, and
total height of three fattest trees were
recorded. Simple t-test was used to compare
whether thinned stands were significantly
different from Teak yield table values in
Dbh, volume, and stocking. Results show
that 88.9% and 11.1% of thinned
compartments were understocked and well
stocked respectively based on the Teak yield
table. Also, 100% and 75% of first and
second thinnings respectively were well
timed whereas 25% of second thinning was
delayed. Among surveyed compartments,
66.7% and 33.3% belong to site classes I and
II respectively. Effects of adequate and
timely thinning on Dbh and volume were 2-
42% and 9-53% respectively. Thinning and
timing promoted positively Dbh and Volume
growth. Adequate and timely thinning
treatments are recommended.
Description
Journal article
Keywords
Tectona grandis, Longuza, Thinning regimes, Growth, Yield