Abstract:

(College of Life Science and Technology, Harbin Normal University, Harbin 150025) Abstract: This article reported on water Pb2+ pollution of heavy metals in aqueous earthworm extent of stress caused. and adopted an acute toxicity method to measure the semi-lethal concentration (LC50) of Limnodilus claparedianus that were disposed in Pb2+ with different concentrations. The variation of L. claparedianus SOD activity toxic was tested by means of enzyme activity. The results showed that the semi-lethal concentration (LC50) of 48 hours was 9.488 μL/L. Pb2+ had a significant effect on L. hoffmeisteri SOD activity (P＜0.05). The SOD activity in the animal specimen increased when they were disposed in low concentration Pb2+ (2.000-8.653 μL/L). But SOD activity in the animal specimen decreased at different levels when concentrations of Pb2+ increased to 12.481 μL/L, a conclusion was achieved that Pb2+ could cause coercion to L. claparedianus and even cause death of animal individuals, and they could also lead to direct and indirect influence on aquatic ecosystems and the subspecies which were fed by L. claparedianus.