Abstract

In this study, 150 sediment samples were collected and the characteristics and influencing factors of phosphorus distribution in the sediments were studied from the Yangzong Lake for fresh-water fisheries. The sources and pollution history of phosphorus were suggested. The results showed that the content of phosphorus in sediments from the Yangzong Lake was in the range of 318-3931 mg/kg. The average contents of arsenic of the sediments from the depths of 0-2, 2-4, 4-6, 6-8 and 8-10 cm were 1151, 1126, 1138, 1057 and 893 mg/kg, respectively. The contents of phosphorus in the sediments were high on both north and south banks and reduced gradually towards the center of the lake. Before the 1980s, the phosphorus distribution in the sediments was mainly influenced by natural factors such as pH value, redox potential and organic matter. But after the 1980s, the phosphorus distribution was mainly affected by the position of sewage discharge. The phosphorus in the sediments had a single source in the past and now the sources tend to be multiple. There was a transition from the point source pollution to non-point source pollution. At present, the water and soil loss and agricultural non-point source pollution are the main sources of phosphorus in the Yangzong Lake.

Keywords:

Fresh-water fisheries, influencing factors, phosphorus, sediment, yangzong lake,

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Competing interests

The authors have no competing interests.

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