土壤有机质和螯合剂对龙葵富集重金属Cd的影响  

Influence of Soil Organic Matter and Chelating Agent on Enrichment Heavy Metal Cd of Solanum nigrum L.

作　　者：王坤[1] 宁国辉[1] 谢建治[1,2] 王文星 梁玉红 

机构地区：[1]河北农业大学资源与环境科学学院,河北保定071001 [2]河北省农田生态环境重点实验室,河北保定071001 [3]泊头市四营乡政府,河北沧州062151

出　　处：《水土保持学报》2014年第3期259-263,270,共6页Journal of Soil and Water Conservation

基　　金：河北省重金属污染农田土壤修复技术规范项目(hbdb2012-03)

摘　　要：采用盆栽实验研究外源添加土壤有机质和螯合剂对龙葵富集Cd含量、土壤中有效态Cd含量以及植株地上部生物量的影响。结果表明,不同有机质和螯合剂处理在相同Cd浓度下,地上、下部植株Cd含量和富集系数分别表现为有机质含量2%〉有机质含量4%〉有机质含量6%和EDTA〉EDDS〉对照,但植物地上部带走Cd量以6%有机质和EDTA处理为最高;土壤有效态Cd含量表现为2%〉4%〉6%,EDTA〉EDDS〉对照;地上部生物量以有机质6%和螯合剂对照处理为最高。随着Cd浓度的增大,相同有机质和螯合剂下,植物Cd含量、地上部带走Cd量和土壤有效态Cd含量均呈增大趋势,但富集系数逐渐降低,其中3种含量有机质土壤下地上部的Cd富集系数变化范围分别为0.43~84.44,0.42~78.74,0.41~76.06;不同螯合剂处理下地上部Cd富集系数的变化范围分别为0.46~90.83,0.57~113.70,0.54~113.28。当Cd添加浓度大于40mg/kg时,龙葵的生长开始受到抑制。A pot experiment was used to investigate the effect of exogenous adding soil organic matter and chelating agent（EDTA and EDDS） on accumulation of heavy metal Cd, soil available Cd content and aboveground biomass of Solanurn nigrurn. L. The results indicated that at the same concentration of Cd in different soil organic matter and chelating agent, the Cd content and enrichment coefficient of aboveground and underground part of Solanurn nigrum L. were organic matter 2 %〉4%〉 6 % and EDTA 〉EDDS contrast, respectively, however, the highest content of Cd in plant were 6 % organic matter and EDTA. Soil available Cd content were organic matter 2% 〉organic matter 4% 〉organic matter 6% and EDTA 〉EDDS 〉contrast, but aboveground dry biomass of 6 % and contrast of chelating agent treatments were the highest. At the same condition of soil organic matter and chelating agent, with the increase of Cd concentration, the Cd content in plant, aboveground part and soil available Cd increased, but enrichment coefficient was opposite. The Cd enrichment coefficient in 3 different kinds of soil organic matter were 0.43-84.44,0.42- 78.74,0.41 - 76.06 and chelating agent treatments were 0.46 - 90.83,0.57 - 113.70,0.54 - 113.28. It illustrated that the growth of Solanurn nigrurn L. was inhibited when the Cd concentration more than 40 mg/kg.

关 键 词：土壤有机质 EDTA EDDS 龙葵 CD 

分 类 号：X705[环境科学与工程—环境工程] S151.93[农业科学—土壤学]