Abstract
ABSTRACT Surface sediment and deep cores from three lakes in northern Germany, representing deposition during the last 4,000 to 14,000 years, were analyzed. Concentrations of organic carbon, phosphorus, iron, manganese, and aluminium were determined to reflect nutrient accumulation. Sequential chemical extraction and scanning electron microscopy with X-ray micro-analysis enabled exact determination of phosphorus binding in the sediment layers. The highest phosphorus concentrations recorded in deeper, anoxic sediments. The dominance of major P-forms varied in the different horizons in the sediment profile and also among the three lakes. No conformity was found among these three lakes and the nutrient and metal concentration.
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