冻融频次与含水量对黑土中镉赋存形态的影响  

The influence of freeze/thaw cycles and water content on the form transformations of cadmium in black soils

作　　者：王洋[1] 刘景双[1] 王国平[1] 王金达[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所

出　　处：《中国环境科学》2007年第5期693-697,共5页China Environmental Science

基　　金：国家"973"项目(2004CB418507);中国科学院东北地理与农业生态研究所学科前沿领域项目(KZCX3-SW-NA3-14)

摘　　要：以24h为1个冻融交替周期,进行了Cd污染黑土不同冻融频次和含水量的实验.结果表明,交换态和有机结合态Cd含量均与冻融次数呈显著负相关(P<0.01),铁锰氧化物结合态和残渣态Cd含量均与冻融次数呈显著正相关(P<0.01),随着冻融次数的增加,有机结合态Cd既可向残渣态转化,也可向铁锰氧化物结合态转化.随着土壤含水量的增加,冻融作用可以促进交换态Cd含量降低;使铁锰氧化物结合态Cd含量增加;有机结合态Cd含量略有增加;但对残渣态Cd含量的影响不大.The test of Cd pollution black soil freezing/thawing at different frequency cycles and the different water content were carried out with 24h as one freeze/thaw period. The content of exchangeable form Cd and organic binding form Cd all presented marked relations （P〈0.01） with the freeze/thaw frequency. With the increasing of freeze/thaw frequency, the organic binding form Cd could transform to the residual form, and also could transform to the iron-manganese oxides binding form. With the increasing of soil water content, the increase of freeze/thaw frequency could promote the lowering of exchangeable form Cd content; causing the iron-manganese oxides binding form Cd content increase; affecting the organic binding form Cd content a little; and the influence on the residual form Cd content was not great.

关 键 词：重金属CD 冻融交替 形态转化 含水量 

分 类 号：X131.3[环境科学与工程—环境科学] S153[农业科学—土壤学]