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The relationship between phosphorus species in sediments and eutrophication level of Lake Baiyangdian

Chemical sequential extraction was employed to analyze the phosphorus species in surface sediments in the representive five sites of Lake Baiyangdian. The results showed that exchangeable phosphorus(Ex-P) was the lowest fraction and had little effect to eutrophication of Lake Baiyangdian. The ironbound phosphorus(Fe-P) was the main fraction. The release of Fe-P in sediment was an important process leading lake eutrophication. The calcium-bound phosphorus(Fe-P) was the primary fraction with occupation of about 62.62%∼73.85% of total phosphorus. The release of organophosphor(OP) in sediment might be an important process leading the eutrophication of Lake Baiyangdian.