Fig. 6
Basal areas and mean diameters of the five virtual stands generated for a sub-stand based on the mean and standard deviation of stand basal area and mean diameter and their correlation. The size of the circle represents the relative area of each virtual stand, calculated from multi-normal probability density function. In both cases, the average value of mean diameters of the cells that constitute the stand (D) is 25 cm and the average stand basal area of the cells (G) is 30 m2·ha− 1. The standard deviations (in brackets) are larger on the left-hand-side diagram and the correlation between basal area and mean diameter is stronger