Data were analyzed using factorial analysis in principal component analysis (PCA) and a univariate general linear model in SPSS 11.5. After confirming that PLFA patterns of the unplanted controls differed from those in the planted pots, we excluded the unplanted pots from the analysis because the emphasis was on the comparison between the planted treatments. Concentrations of phospholipid fatty acids (expressed as log10mol%) were subjected to analysis of variance (ANOVA). A two-way analysis of variance (water × plant species) was used to determine statistically significant differences between treatments.