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| Phsophorus sorption capacity of surface sediments and risk assessment of potential phosphorus release in Lake Xiaoxingkai, China |
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Abstract Phosphorus sorption capacity of surface sediments are estimated by phosphorus sorption index (PSI) of sediments and degree of phosphorus saturation (DPS) in Lake Xiaoxingkai, China. The relationship between DPS and other indicators were analyzed, and the risk of potential phosphorus release were discussed by calculating phosphorus release risk index (ERI). The results showed that PSI ranged from 9.78 to 197.53 (mg?L)/(100g?μmol), with an average of 59.77 (mg?L)/(100g?μmol). DPS ranged from 9.95% to 24.47%, with an average of 15.41%. PSI was significantly and positively correlated to phosphorus (Pox), iron (Feox) and aluminum (Alox) extracted from sediment by ammonium oxalate. Rion extracted from sediment by ammonium oxalate might be the main factor to affect PSI. DPS was influenced mainly by original adsorbed phosphorus of sediments (or Pox). In addition, ERI ranged from 8.99% to 129.94%, which indicated that the Lake Xiaoxingkai might be in high potential eutrophication risk due to the release of phosphorus from surface sediments. Compared to the different sample points, the north area polluted by agricultural non-point source pollution has higher potential eutrophication risk than other areas.
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Received: 30 November 2013
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