摘要：Although sediment is an essential component of wetland ecosystems, few studies have investigated the use of wetland sediments for agriculture. To explore how the application of wetland sediments to agricultural soils affects soil Pb and Cu speciation, sediments from the Baiyangdian Lake are considered in this study. Changes in the speciation of Pb and Cu in soils planted with winter wheat before and after the application of wetland sediments were determined in addition to the concentrations of Pb and Cu in the different organs of winter wheat. As the sediment application rate increased, the amounts of exchangeable Pb and Cu, Pb and Cu bound to carbonates, iron and manganese oxides, and organic matter, and the residual Pb and Cu contents in the soil increased. The accumulation of Pb and Cu in the plant organs decreased as follows: root > stem and leaf > grain. However, the concentrations of Pb and Cu in the wheat grains did not exceed the Chinese standard limits. The winter wheat yield and above-ground biomass increased before decreasing. With increasing sediment application, the amount of Pb taken up by the winter wheat from the soil generally increased, and the amount of Cu taken up by the winter wheat generally increased and then decreased. This research has important practical implications for the effective utilization of lake and wetland sediments.
