It is generally believed that excessive P release from lake sediments, i. e. internal P load, is only a problem in deep lakes with stagnant anaerobic bottom waters. However, substantial amounts of P can also be released from sediments in shallow, well-mixed lakes. The dynamics and magnitude of P release from sediments in these types of lakes are affected primarily by physical factors, such as seasonal variations in water temperature and year-to-year differences in water renewal. These factors, in turn, induce chemical and microbiological processes which regulate the exchange of substances between sediments and water. The fractional distribution of sedimentary P and the chelating capacity of the water are also important factors that can provide insights to the processes involved and their quantitative impact on the P status in shallow, eutrophic lakes.
Coworkers: Sven-Olof Ryding
Keywords: sediments, phosphorus release, regulating factors, ractional distribution, predictive model
Report number: A482
Authors: Sven-Olof Ryding
Published in: Hydrobiologie 70(1985):5. Pages 657 - 702