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

Figure 4

Comparison of distance methods and respective estimators (-Square, ; PCQM, ; -tree, ) with quadrat counts, for tree density estimates in all six Pittosporum undulatum stands. The bars represent the estimated relative difference between each distance method and the estimated tree density using quadrat counts, as obtained from contrast analysis applied after ANOVA (divided by tree density estimated by quadrat counts and expressed as a percentage).