紫色土锌镉复合污染效应与机理研究

Study on Mechanisms and Effects of Cd-Zn Compound Pollution in Purple Soil

采用盆栽试验结合野外调查，研究紫色土锌镉复合污染对莴笋、蕃茄、甘兰、小麦等的作物效应与原因。结果表明，锌镉复合污染加剧锌的毒害作用，但缓解镉毒性，其原因在于：低浓度镉促进锌吸收、高浓度锌抑制镉吸收。土壤锌镉复合对二价离子的竞争效应也影响其生态效应。

Pot experiments and fields investigation were conducted to study crops(wheat,lettuce,tomato and cabbage) effects and mechanisms under Cd-Zn compound pollution in purple soil.Results showed:Zinc toxicity was enhanced by cadimum under compound pollution,wherever cadmium toxicity was alleviated by zinc.Those are owing to competition between bivalent elements in plants,in which Zn uptake was promoted by low contents of soil cadmium,and Cd uptake was depressed by high contents of soil zinc.