Accumulation of cadmium and copper by female Oxya chinensis(Orthopera: Acridoidea) in soil-plant-insect system

One purpose of this research is to present accumulation of cadmium(Cd) and copper(Cu) by female Oxya chinensis(Orthopera: Acridoidea) in a simulated s oil-plant-insect ecosystem treated with Cd. Fourth-instar nymphs of O. chinensis had been fed on wheat(Triticum aestivum) seedlings contaminated with Cd and Cu for one month. In the ecosystem, the Cd concentration in wheat seedlings rose gr eatly with the increasing of Cd in the soil, but the Cu concentration in wheat s eedlings was not found elevated. There was a highly significant difference(P<0. 05) in Cd concentrations of wheat seedlings and not any significant difference(P >0.05) in Cu concentrations of wheat seedlings. The Cd and Cu concentration in different body part-head, thorax, abdomen, and hind femur, varied under differen t Cd concentrations in soil. There were significant differences(P<0.05) in the four parts of Cd and Cu accumulations with all treatments. The order of Cd accum ulation was thorax>abdomen>head>hind femur and the Cu was abdomen>thorax>he ad>hind femur. The results indicated that Cd and Cu were accumulated from the s oil to grasshoppers through the plant; that is to say, Cd and Cu in environment could be transported to animal or human via food chain.