The effect of spatial structure of forests on the precision and costs of plot-level forest resource estimation

Forest Ecosystems

Table 3 Average expected costs (time in minutes) for measuring eight different sample plots, cost savings (in %), and loss of precision (in %) determined by the increase in standard deviation of the estimator for basal area and tree density

The values are presented separately for clustered and regular patterns. Percentages are calculated in reference to the concentric plot with a 9 m maximum and a 6 m inner radius. For all concentric plots, trees with a dbh<10 cm were only measured in the inner circle