Volume estimation models from stump diameter for teak (Tectona grandis Linn f.) plantation in Nimbia forest reserve, Nigeria

Five different equations were developed for teak (Tectona grandis (Linn. f.)) plantation in Nimbia forest reserve using stump diameter (Dst) as independent variable. The volume equations developed were linear, logarithmic and quadratic in nature. Stratified random sampling technique was employed to select 10 sampling plots for data collection. The number of trees per plot ranged from 21 to 43 with the total of 362 trees. The mean Dst and volume was 17.83 and 0.076607 respectively. Adjusted coefficient of determination (Adjusted R2) and root mean square error (RMSE) were used to rank the developed models. The resulting equations were tested for validation with independent data set obtained from additional plots and were found to be desirable for estimating the merchantable volume for teak in Nimbia forest reserve, Nigeria.