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研究论文

ABSORPTION AND THE EFFECT OF CLEANTING UP OF RAMIE (B.nivea (L).Gaud) ON SOIL CADMIUM

摘要：通过4年微区定位试验,研究了苎麻对土壤Cd的吸收及其净化效应。结果发现,苎麻地上部分年生物产量(Y_B)与土壤Cd含量(S_C)的关系可用对数函数模型LogY_B=3.3874-0.0753(LogS_C)²描述；地上部分Cd积累量(T_A)与土壤Cd含量和生物产量关系函数为T_A=2.9974-0.0556S_C+0.0001S_C·Y_B;在上述两个模型的基础上,求导出苎麻净化土壤Cd的时间(T)需求预测模型为T=5495.57+31.62S_Ci-470.96T_Ai-1-1.675S_Ci·T_Ai-1.预测分析表明,利用苎麻吸收作用,使土壤Cd含量每降低1mg/kg需要21-91年,因此,生物改良措施的实际可行性值得商榷。

Abstract：A 4 year microplot locating experiment was made to study the absorption and effect of cleaning up of ramie plants (B.nivea (L).Graud) on soil Cd. Results showed that the relationship between biomass of the upper ground part of ramie (Y_B) and Cd content of the soil could be described by the logarithmic model of LogY_B=3.3874-0.0753（LogS_C）², and the relationship among the amount of Cd accumulation by the upper ground part of ramie(T) and the content of soil Cd and biomass of the upper ground part of ramie was fitted exactly by the model of T_A=2.9974-0.0556S_C+0.0001S_C·Y_B. Based on these two models, a forecast model of the time(T) needed for cleaning up soil Cd by ramie plants was conducted: T=5495.57+31.62S_Ci-470.96T_Ai-1-1.675S_Ci·T_Ai-1recasting result showed that 21—91 years would be needed for reducting each 1 mg/kg of soil Cd by the absorpting of ramie plants. It is obvious that the feasibility of biological measure for cleaning up soil Cd is open to question.