title: Phosphorus and copper leaching from dredged sediment applied on a sandy loam soil: column study.
abstract: In this paper, downward movement of phosphorus and copper as dredged sediment applied on sandy loam soil was studied by column leaching experiments. Three sediment application rate, (i.e., 1, 2 and 5-cm depth of sediments) were applied to the top of the soil columns. Two and a half months leaching experiments were conducted, which include a 15-day un-watered period. Concentrations of phosphorus and copper in the leachate and the vertical distribution of Olsen-P and diethylenetriaminepentaacetic acid (DTPA) extractable Cu in the soil columns were determined. The results showed that, un-watered period could increase the downward movements of phosphorus and copper. Sediment application significantly increased Olsen-P concentration in the top 15 cm of the soil columns, but has not significantly affected that in the deeper soil layer. The 1-cm depth sediment treatment did not increase the DTPA extractable Cu concentration in the whole soil column. The 5-cm depth sediment treatment, however, significant increased the DTPA extractable Cu in the deeper soil layers. This study suggested that the application of dredged sediment laden with P and Cu on sandy loam soil might cause the significant downward movement of phosphorus and copper.
mesh_terms: D000704:Analysis of Variance; D002681:China; D003300:Copper / Q000737:chemistry*; D019015:Geologic Sediments / Q000032:analysis*; D007700:Kinetics; D010758:Phosphorus / Q000737:chemistry*; D045483:Rivers; D012987:Soil / Q000032:analysis*
chemical_list: D012987:Soil; D010758:Phosphorus; D003300:Copper