土壤质地和碳氮比对龙葵富集重金属Cd的影响  

Influence of Soil Textures and Carbon Nitrogen Ratio on Enrichment Heavy Metal Cd of Solanum nigrum L.

作　　者：王坤[1] 王小敏 赵勇[3] 林志[1] 谢建治 

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]河北农业大学农学院,河北保定071001

出　　处：《水土保持学报》2014年第2期199-203,220,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(hbdb2012-03)

摘　　要：在盆栽种植龙葵条件下，研究土壤质地、碳氮比和外源投加Cd对龙葵地上、下部富集重金属Cd、土壤有效态Cd含量和地上部生物量的影响。结果表明，相同Cd投加浓度时，不同质地和碳氮比处理，植株地上、地下部Cd含量、富集系数均为砂土〉粘土〉壤土和25；1〉35：1〉15：1，但植株地上部带走Cd量以壤土和碳氮比25：1为最高；土壤有效态Cd含量为砂土〉壤土〉粘土，碳氮比处理25：1〉35：1〉15：1；地上部生物量以壤土和碳氮比15：1为最高。同一质地和碳氮比下，随着外源添加Cd含量增加，植株地上、地下部Cd含量、植株地上部Cd含量除粘土、砂土先增后降外，其他处理均呈增加趋势，且土壤有效态Cd含量也随之增大，但富集系数随之减小，Cd投加量大于20～40mg／kg时对龙葵生长产生一定的抑制作用。Under the condition of potted of Solanum nigrum L. , to study the soil textures and carbon nitro- gen ratios at exogenous adding the gradients of Cd that the influence of on the ground and the lower, concen- tration of heavy metal Cd, soil available Cd content and aboveground biomass to plant. The results of pot ex- periments showed when it was in the same Cd additive concentration, different soil textures and carbon nitro- gen ratios, the overground and underground part of Cd content in dry biomass, concentration coefficients re- spectively manifested sandy〉clay〉loam soil and 25 ： 1〉35 〉 1〉15 〉 1, but the highest content of Cd in plant were loam and 25 〉 1 of carbon and nitrogen ratio. Soil effective state of Cd content were clay〉loam〉 sandy soils, 25 〉 1〉35 ： 1〉15 ： 1, respectively, aboveground dry biomass of loam and carbon nitrogen ratio of 15 ＂ 1 were the highest. At the same situation of soil textures and carbon nitrogen ratios, with the added exogenous Cd content increased, except for clay and sandy soil, other treatments increased at first and de- creased afterwards, that the overground and underground part of Cd content in plant and soil effective state of Cd content raised as well, but enrichment coefficient decreased, which illustrated that when it was in the dosage of Cd greater than 20〉40 mg/kg, it had influence quantity for the growth of Solanum nigrum L.

关 键 词：土壤质地 碳氮比 龙葵 CD 

分 类 号：X53[环境科学与工程—环境工程] S152.3[农业科学—土壤学]