Effect of root oxygen stress on phosphorus uptake by cattail

The effect of redox conditions or oxygen demand in rooting medium on phosphorus (P) uptake by Typha domingensis was quantified; Phosphorus uptake decreased with decrease in redox potential in the rooting medium. Greatest uptake was measured under the oxidized treatment (+565 mV). Phosphorus uptake was less under the two anaerobic treatments (+277 mV and -200 mV). In the two anaerobic treatments, P uptake was considerably less at -200 mV in which a high oxygen demand was created using titanium (Ti3+) citrate. Results suggest that P uptake by Typha domingensis in wetland receiving P input from adjacent agriculture areas could be influenced by the oxidation-reduction Status of the root environment.