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Assessment the influence of P availability of sediments in Lake Taihu to Microcystis aeruginosa using different methods |
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Abstract Diffusive gradients in thin-films (DGT) technique, four traditional extraction methods for bioavailable phosphorus (water soluble P, readily desorbable P, algal-available P and NaHCO3extractable P) and algal assay were compared to investigate availability of phosphorus (P) in sediments from 9 sampling sites in Lake Taihu to Microcystis aeruginosa. DGT-measured P (DGT-P) showed higher correlation (R2 =0.941, P<0.01) with algal growth than other traditional extraction methods for bioavailable phosphorus (R2 =0.780, 0.806, 0.849 and 0.910 for WSP, RDP, AAP and Olsen-P, respectively, P<0.01). Therefore, DGT technology could be considered as a good tool to assess bioavailability of phosphorus in sediments to algae.
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Received: 11 January 2011
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