Abstract
AbstractFormer agricultural fields that are converted to wetlands can serve as either a source or a sink of P to connecting downstream water bodies. Understanding the P dynamics associated with these flooded fields can lead to appropriate mitigation strategies. We investigated P dynamics in flooded celery fields that are adjacent to and connect with a major tributary that eventually flows into Lake Michigan. We measured the P concentrations and loads in the tributary upstream and downstream of the flooded celery fields. Mean total P (TP) load was 2.6× greater downstream than upstream of the flooded celery fields. Turbidity, chlorophyll a, and soluble reactive P (SRP) concentration all were significantly greater at the downstream sampling site than at the upstream site. Mean water-column TP concentrations in the flooded celery fields ranged from 368 to 810 µg/L, compared to mean TP concentrations of 29 and 46 µg/L at the upstream and downstream sampling sites, respectively, in the tributary. Equilibrium P ...
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