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P fractions obtained by sequential extraction from coastal wetland soils, including bare flat (BF) land, land invaded by Spartina alterniflora (SA), and land occupied by Phragmites australis (PA). (a) Available P = Resin-P + NaHCO3-Pi; (b) secondary P; (c) primary P; (d) occluded P; (e) organic P = NaOH-Po + NaHCO3-Po. Vertical bars indicate standard deviations of the mean (n = 5). For each parameter, different letters indicate significant differences between means at P < 0.05.
