Algal uptake of hydrophilic and hydrophobic dissolved organic nitrogen in the eutrophic lakes

Abstract Dissolved organic nitrogen (DON) derived from sediments plays an active role in biogeochemical cycling of nutrients in aquatic ecosystems. Sediments from four eutrophic lakes were studied using three-dimensional fluorescence excitation-emission matrix (3DEEM) spectra and supelite XAD-8 macroporous resin separation to investigate the bioavailability of hydrophilic and hydrophobic DON to algae ( Microcystis flos-aquae (Wittr.) Kirchner). The results showed that the average loss of DON was