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| Spatiotemporal distribution of black carbon and its effect on phosphorous speciation in surface sediments of Shanmei Reservoir |
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Abstract Temporal and spatial distributions of black carbon in surface sediments of a subtropical reservoir were investigated and the effects of black carbon on different phosphorous species were explored as a case study of Shanmei Reservoir in Fujian Province. The mass concentrations of black carbon (BC) in surface sediments were 2.44to 5.28g/kg in Shanmei Reservoir, which higher than those in coastal sediment. It was consistent with the results from the studies on reservoirs abroad. Overall, the BC concentrations were higher in wet season than in dry season. There were highest BC concentrations at the inlet area followed in order by those at the tail area, the dam nearby area and the middle area of the reservoir. The concentrations of black carbon had a significantly positive correlation with the concentrations of total organic carbon in the sediments, but no correlation with particle size. The ratio of black carbon to organic carbon was averaged as 24.95%, which indicated that the BC source was complex, and it commonly originated from terrestrial biomass combustion and combustion of fossil fuels. Black carbon and two active species of phosphorus (organic phosphorus and iron/aluminum bound phosphorus) were correlated significantly. Black carbon had a certain fixation to absorb these phosphorus forms, which would cause certain inhibition on the release of sediment phosphorus.
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Received: 30 August 2013
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