摘要
选择东北地区典型土壤-棕壤作为供试土壤,在室内培养条件下,采用逐级提取法,通过逐步回归分析研究了冻融作用对镉在土壤中赋存形态的影响。结果表明:土壤中添加外源重金属镉后,不同形态镉的含量差异很大,在本试验条件下镉主要以交换态为主,其次为残渣态,有机结合态、铁锰氧化物结合态含量相对较低;在冻融作用下,水分和冻融频次对各形态镉含量的影响达到了极显著水平(P<0.01);利用逐步回归分析建立了水分和冻融频次对不同形态镉含量影响的最优回归方程。
Brown earth as experimental soil, the effect of freeze-thawing cycles on the forms fractionation of cadmium adding into the soil was studied by the method of chemical sequential extraction in indoor incubation experiment. It adopted stepwise regression analysis to process the data. The results showed that form transformation of cadmium occurred after adding cadmium into soil. Exchangeable cadmium was the main form, secondly was residual form, the content of organic-binding cadmium and Fe-Mn oxide-binding forms were relatively low. The effect of water and frequency on the contents of different forms reached a very significant level under freeze-thawing cycles（p〈0.01 ）. Optimal regression equations about the effect of water and frequency on different forms contents of cadmium were obtained by stepwise regression analysis.
出处
《土壤通报》
CAS
CSCD
北大核心
2008年第4期826-830,共5页
Chinese Journal of Soil Science
基金
国家973计划(2004CB418504)资助项目-东北老工业基地环境污染形成机理与生态修复研究
沈阳农业大学青年基金资助项目
关键词
镉
形态转化
冻融作用
土壤
Cadmium
Form transformation
Freeze-thawing Cycles
Soil
