Baltimore Ecosystem Study Institute of Ecosystem Studies

2011 BES Annual Meeting Presentation and Poster Abstracts

Phosphorus sorption of stream sediments in Baltimore Watershed
Deng, Hong
Co-Authors: Hong Deng, Sujay Kaushal

Abstract: Phosphrous (P) is often a key limiting nutrient in freshwater systems, and excessive loadings of P can result in degraded water quality and algal blooms. P sorption is an important process in aquatic ecosystems whereby phosphate (PO43-) is exchanged between liquid and solid phases. Sediments with high ability of P sorption will retain large quantities of phosphate, which facilitates low levels of nutrients in water, but will also be a source of releasing P to water phase, depending on both sediment and water chemistry. Here we studied P sorption characteristics EPC0 (Equilibrium Phosphate Concentrations) in stream sediments of Gwynns Falls watershed based on the method of batch equilibrium experiments. Comparing sediment EPC0 with water P level will provide useful information to understand how the role of sediments in P retention.