Abstract
The sediments of two hypereutrophic lakes (Stone Lake, Michigan and Lake Charles East, Indiana) were studied to determine phosphorus sorption and release tendencies as they vary seasonally. Techniques used were chemical extractions of phosphorus forms from core fractions and the incubation of undisturbed cores in the laboratory under ambient conditions of temperature and dissolved oxygen. The uptake of phosphorus during aerobic periods was found to be in accord with previously observed trends in that the amount sorbed was proportional to overlying phosphorus concentration supporting an adsorption type of model. Phosphorus was given off during anoxic periods, however, the specific release rates could not be correlated with the gradient of interstitial phosphorus to overlying phosphorus concentrations as reported by others. Rather, release rates were closely correlated with average interstitial phosphorus concentrations. A diffusion model is presented, applicable to systems similar to those studied, in which soluble interstitial phosphorus varies from a greatly elevated concentration in close proximity to sediment particle surfaces to levels approaching those of overlying phosphorus.
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