and anoxic, FeIII is reduced to FeII, phosphate sorption decreases
substantially and wetlands can then switch from sinks
to sources of phosphate (Loeb et al. 2008; Hoffmann et al.
2009; Kjaergaard et al. 2012). Due to natural soil variability
augmented by wetland redox dynamics, the content of P
sorbents, and hence P retention/solubility may be expected
to exhibit great variation over time and in space (Courtwright
and Findlay 2011).