冻融作用对黑土重金属Zn形态转化的影响  

Effects of Freeze/thaw on the Fraction Transformations of Heavey Metal Zn in Black Soil

作　　者：王洋[1,2] 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,吉林长春130012 [2]中国科学院研究生院,北京100049

出　　处：《土壤通报》2008年第6期1436-1440,共5页Chinese Journal of Soil Science

基　　金：国家重点基础研究发展规划项目(2004CB4185007);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：通过对重金属Zn污染的黑土进行冻融频次和不同含水量的实验研究得到,随着冻融次数的增加,重金属Zn交换态含量,铁锰氧化物结合态含量和有机结合态含量均呈不同程度的降低趋势,残渣态含量明显增加,表明冻融作用可使土壤重金属Zn生物有效态含量降低。重金属Zn各赋存形态含量与土壤所经历的冻融次数之间呈二次多项式的函数关系,相关系数在0.948和0.988之间。随着土壤含水量的增加,冻融作用对重金属Zn交换态含量影响不大,铁锰氧化物结合态含量降低,有机结合态含量增加,而残渣态含量明显增加。The investigations of freeze/thaw cycles frequency and the water contents impacted on the fraction transformations of Zn in the black soil indicated that the fraction transformations of heavy metal Zn exchangeable fraction, organic matter binding fraction and iron-manganese oxides binding fraction decreased and the residual fraction increased obviously with the increasing frequency of freeze/thaw cycles. The functions between each heavy metal Zn fraction and the frequency of freeze/thaw cycles were quadratic functions, and the coefficients of all functions were between 0.948 and 0.988. With the increasing of water content in soil, the alterate of freeze/thaw could promote the decrease of the iron-manganese oxides binding fraction Zn, promote the increase of the organic matter binding fraction Zn and the residual fraction Zn obviously, and affect the exchangeable fraction Zn.

关 键 词：重金属ZN 形态转化 冻融交替 含水量 农田黑土 

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