Temperature and Cyanobacterial Bloom Biomass Influence Phosphorous Cycling in Eutrophic Lake Sediments

• DOI: 10.1371/journal.pone.0093130
• Publication Date: 2014-03-29T01:09:58Z
• Authors: Mo Chen; Tian-Ran Ye; Lee R. Krumholz; He-Long Jiang
• Keywords: Cycling; Microcosm; Amendment; Bloom; Nutrient cycle; Biogeochemical Cycle

Cyanobacterial blooms frequently occur in freshwater lakes, subsequently, substantial amounts of decaying cyanobacterial bloom biomass (CBB) settles onto the lake sediments where anaerobic mineralization reactions prevail. Coupled Fe/S cycling processes can influence mobilization phosphorus (P) sediments, with high releases often resulting eutrophication. To better understand eutrophication Lake Taihu (PRC), we investigated effects CBB and temperature on sediments. Results indicated that added not only enhanced sedimentary iron reduction, but also resulted a change from net sulfur oxidation to sulfate which jointly spike soluble Fe(II) formation FeS/FeS2. Phosphate release was amendment along increases reduced sulfur. Further phosphate associated incubation temperature. In addition, shift P Fe-adsorbed relatively unreactive Residual-P pools more reactive Al-adsorbed P, Ca-bound organic-P pools. Phosphorus rates increased addition were higher at elevated temperatures, These findings suggest settling into will likely increase extent aquatic environments these be magnified temperatures.