Comparison of -Square, Point Centered Quarter, and -Tree Sampling Methods in Pittosporum undulatum Invaded Woodlands

Figure 7

Comparison of the precision obtained when using distance methods or quadrat counts to estimate tree density. The bars represent the ratio between the coefficient of variation (CV) obtained for each estimator and the CV obtained when using quadrat counts. The 100% red line corresponds to the same CV for both the distance estimator and the quadrats.