Nutrient Speciation and Distribution between Surface Water and Sediment in the Middle Reach of the Huai River, China

Abstract

The speciation and distribution of the nutrients nitrogen and phosphorus in riverbed sediment play an important role in river water quality and are the primary product for the river ecosystem. Previous research on river nutrients has not considered the relationship between nitrogen and phosphorus and their mobility effects. To investigate the role of nitrogen and phosphorus in water quality and their interactions between sediments and water, sediment and water samples were taken from 10 sites along the middle main stream of the Huai River in China from Linhuaigang to Fengtai County on December 12, 2008. Nitrogen and phosphorus concentrations in water, organic matter (OM), and different forms and contents of the elements in sediment were investigated. Results showed a positive correlation between total nitrogen in sampled sediments, primarily occupied by organic nitrogen and chlorophyll