Table 3 . Characteristics of TWINSPAN sample groups (A – G) and
sample-group devoid of vegetation (H): (a) Classification statistics and
vegetation variables; (b). Environmental variables. Data for variables
are mean values ( ± standard error where applicable). Per variable,
means sharing a superscript letter in common do not significantly differ
(p <0.05: ANOVA with Tukey’s post-hoc mean separation
test (vegetation height; total PAH), or Kruskal-Wallis tests (all other
variables): tests only applied for individual PAHs where at least one
TWINSPAN group mean value exceeded 20.0 µg kg-1 soil
dry weight). Variables were log10-transformed where
necessary to normalize the data. Values for total PAH content are the
sum of all component PAHs measured. Units for PAHs (see Methods for
abbreviations): µg kg-1 soil or plant tissue dry
weight. For further information see caption to Table 1.