Diameter distribution model was developed for tropical rainforest of Oban Forest Reserve. Multistage sampling technique was adopted for the study. The sampling procedure was made up of primary, secondary and tertiary sampling units. A total of 808 trees were measured in 14 tertiary sample plots (40m x 50m). Tree outside bark diameter at breast height (dbh) data, were measured for tree species with dbh ≥ 10 cm within the tertiary sampling units. Data were analysed on several probability density function (pdf), then ranked based on Kolmogorov smirnov, Anderson darling and Chi-Square.
Volume equations were developed for tree species of leguminosae family in two tropical rainforest, Nigeria. The data used consist of merchantable volume, stump diameter, diameter at breast height and merchantable height for 22 tree species. The number of observations per species ranged from 1 to 30 while the diameter at breast height ranged from 10.00 cm to 132.20 cm. The result in this study shows that generalised logarithmic volume function (also termed Schumacher's volume function) performed better than other forms of volume functions. For example, the best adjudged volume for all species combined were and . The merchantable volume developed from double-variable function indicates negative intercept while the single-variable volume function represents the logarithmic nonlinear function and performed best within the limit of data used for each species group. The method of species grouping in this study was morphological and was based on sub-families of tree species. The
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