Formação de fuste do mogno africano (khaya grandifoliola C. Dc.) no início da cultura
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2019-09-04
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Universidade Federal de Goiás
Resumo
The worldwide demand for timber and non-timber products has been growing every year
and to keep up with this need, Brazilian companies are investing in new research and
technologies with forestry plants such as African mahogany. This study aimed to carry out
a forest inventory of a commercial mahogany (Khaya grandifoliola) plantation in the first
years after planting. The African mahogany population is located on a private property in
the municipality of Piracanjuba in the state of Goiás, where seedlings of seminal origin from a
commercial nursery were used. Twenty random plots with 15 m radius were allocated and
the total height, DBH, crown area and stem height of all trees within the plots were
measured, together with the estimated forest cover of each plot. To measure the total height
and stem, a digital clinometer was used where the operator was 15 m from the target tree.
The DBH was collected using a stick and the crown areas were obtained through the
ellipse area formula using the two diameters collected in the field using a measuring tape.
Using a related forest densiometer it was possible to estimate the incidence of light in the soil.
Four hypsometric models were pre-selected and adjusted by linear regression. The selection of
the best equation was performed based on the adjusted determination coefficient and
estimate standard error (Syx%). The models were also validated by assessing the predictability
(ρ) and square root mean deviation (RMSE). The results showed a strong relationship between
the dependent variable total height and the independent stem height and DBH. At four years of
age, the largest class of stem height ranges from 3,1 to 4,1 m and most trees have a DBH
ranging from 0,084 to 0,126 m. The percentage of trees that already have a stem higher
than 6 m in height is 8,35%. The percentage of trees that have already reached 50 cm of
DBH at this age is null. The linear model is slightly better for estimating total heights (Ht)
with of 0,61 and Syx% of 14,64%. To estimate the height of the stem (Hf) the best models
are the Quadratic and Weibull models, where the validation of the Quadratic model showed
that the estimates are reliable with an error of 24,11% and the Weibull model with 24,86%
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MATIAS, Renan Krupok. Formação de fuste do mogno africano (khaya grandifoliola C. Dc.) no início da cultura. 2019. 47 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2019.