TITLE:
Probabilistic Distributions for Acacia Mearnsii De Wild Total Height and the Influence of Environmental Factors
AUTHORS:
Carlos Roberto Sanquetta, Alexandre Behling, Allan Libano Pelissari, Ana Paula Dalla Corte, Sylvio Péllico Netto, Augusto Arlindo Simon
KEYWORDS:
Wakeby Distribution; Forest Stand Age; Cultivation Area; Forest Structure
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.2 No.3,
February
11,
2014
ABSTRACT: This paper discusses the hypothesis of height distribution on a
forest stand of Acacia mearnsii De
Wild, known as black wattle. It remains constant at varied growing environments
and, in addition, they are not influenced by age factor. The Wakeby equation was
applied. The research was carried out in a black wattle stand at varied age
levels and over two different agroecological regions where plantations are
found: Serra do Sudeste and Encosta do Sudeste, Rio Grande do Sul State,
Brazil. It was observed that as the age rises there is an increase in the stand
total height; while the number of trees decreases for the lower classes, it
increases for the upper ones. This resulted in lengthening of the curve tail to
the left and mode shift to the right, generating negative asymmetrical curves. Two
types of height distribution were found: the sharp increase of probability in a
specific class and some similar probabilities in successive classes. The
distribution curves between the cultivation areas were statistically different
and therefore the height distribution was dependent of environment.