Related Experiment Video
Updated: Jul 4, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
Published on: March 6, 2014
Effects of bacteria on nitrogen and phosphorus release from river sediment
Qunhe Wu1, Renduo Zhang, Shan Huang
1School of Environmental Science and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, China. eeswqh@mail.sysu.edu.cn
Abstract:
To better understand the mechanisms of eutrophication, we addressed the microbial processes that influence many key aspects of water-sediment systems. In this study, a large column experiment was conducted for 30 d. Along the column, solution samples were collected at different locations at different time. The samples were analyzed for physical, chemical, and biological properties of the sediment and overlying water. The results showed that the amount of nitrogen transforming bacteria was higher than that of phosphorous bacteria. The amount of nitrogen transforming bacteria was in the order: ammonifier > denitrifying bacteria > nitrobacteria and nitrosomonas. Principal component analysis indicated that the three main factors accounted for more than 90% overall contributions for bacterium growth, which represented nutrition, organics and oxygen, and pH and redox potential (Eh) of the environment. Corresponding to the bacteria, the concentrations of nitrogen in the system was in the order: ammonia (NH4(+)-N) > nitrate (NO3(-)-N) > nitrite (NO2(-)-N). The fluxes of N and P clearly showed a temporal release and adsorption processes in the water-sediment system. The large magnitude of N fluxes suggested that N might act as an important contamination source for the water quality. However, P exchange between the sediment and overlying water was less intensive during the experiment.
More Related Videos
Related Concept Videos
Environmental Applications of Microorganisms
Microbial Wastewater Treatment
The Phosphorus Cycle
Microbes and the Nitrogen Cycle
Metabolism of Chemolithotrophs
The Nitrogen Cycle

