TITLE:
Height-Diameter Relationship of Some Forest Species Exploited for Wood in the Natural Tropical Forest of the Congo Basin
AUTHORS:
Amougou Ndi Yves Achille, Hans Beeckman, Ndongo Din, Amougou Amougou François Borgia, Zekeng Jules Christian, Mbolo Marie Marguerite
KEYWORDS:
Relationship, Height, Diameter, Tree, Natural Rainforest
JOURNAL NAME:
Open Journal of Forestry,
Vol.12 No.2,
April
29,
2022
ABSTRACT: To enrich knowledge on the growth dynamics of commercial forest species
in the Congo Basin, a study was conducted in Cameroon, within a community
forest in savannah forest transition zone (Zone 1) and within FMU 10 052 in
dense semi-deciduous humid forest (Zone 2). It aimed to obtain, in 8 species, the height (H)
of the tree from its diameter (D) more accessible: Entandophragma cylindricum (Meliacea), Eribroma oblongum, Sterculia rhinopetala et Triplochiton scleroxylon (Malvaceae); Erythrophleum
suaveolens et Piptadeniastrum
africanum (Fabaceae), Milicia excelsa (Moraceae) et Terminalia superba (Combretaceae). The destructive method was used. After felling and flushing out
a tree, the dendrometric parameters were measured and/or calculated. In Zone 1,
6 species including T. scleroxylon were calibrated using 30 trees of
each. In Zone 2, 45 trees of E. cylindricum, 99
of E. suaveolens and 82 of T. scleroxylon constituted
the sample. At the 5% threshold (95% confidence interval), the
height-diameter relationship is a linear model. In all species, the height of a
tree is predicted by measuring its diameter through linear regression. In Zone
1 regression equation is: H(m) = 28.13 + 19.09 * D(m) for T.
scleroxylon; H(m) = 12.35 + 30.38 * D(m)
for S. rhinopetala; H(m) =
23.09 + 26.42 * D(m) for E.
oblongum; H(m) = 14.86 + 20.92 * D(m)
for P. africanum; H(m) = 14.98 + 24.78 * D(m)
for T. superba and H(m) = 1.55 + 32.37 * D(m) for M. excelsa. In Zone 2, the relationship
is: H(m) = 27.40 + 14.21 * D(m) for T. scleroxylon; H(m) = 7.79 + 20.18 * D(m) for E.
cylindricum and H(m) =
20.08 + 9.74 * D(m) for E. suaveolens (probability associated
with F