Growth and yield studies of pinus patula at Mount Meru plantations
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Date
1998
Authors
Journal Title
Journal ISSN
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Publisher
Sokoine University of Agriculture
Abstract
The main objective of the study was to produce a precise method for estimating growth and yield for Pinus patula at Mount Meru plantations. Using data from 75 temporary sample plots (with size varying from 0.04 to 0.71 ha) distributed
over the whole plantation, different functions necessary
for the building-up of the model were developed.
Statistical packages (QUATRO and EXCEL) were used to fit
equations for site index curves, single tree volume, height
/diameter, taper, Weibul diameter distribution,
increment, stand basal area,These submodels were
diameter stand volume and mortality. integrated into computer model
in BASIC language capable of estimating yields at a particular
age under different stocking levels and thinning regimes.
The stand inputs necessary to run the program are present
and projection age, number of stems per ha, stand mean and
standard deviation of dbh, dominant height, area per hectare and minimum top diameter. site, basal The model gives out yearly figures per ha for number of
stems, mean total and merchantable volume, dbh, products. mean height, mean
tree total basal area, volume and thinning The cumulative volumes, basal areas and their increments are also produced. Based on cumulative volume production, mean tree size, the mean annual volume increment and the current problem of
funds for thinning operations, the no thinning option with
a wider spacing of 3.0 x 3.0 m was recommended instead of
the current option with three thinnings and an initial
spacing of 2.5 x 2.5 m. Yield table printouts were produced
based on this option and over all site classes found at
Meru plantations. A stand volume table was also constructed
for quick stand volume estimation.
Description
Phd Thesis
Keywords
Growth model, Yield models, Pinus patula, Mount Meru plantations