镉污水灌溉下芦蒿生长及镉富集特性研究  

Growth of Seleng wormwood & Cd accumulated effect in the Cd-contained sewage-irrigated soil

作　　者：蒋培[1] 宗良纲[1] 沈莉萍[1] 刘卫星[1] 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095

出　　处：《安全与环境学报》2009年第4期1-4,共4页Journal of Safety and Environment

摘　　要：通过生物盆栽试验,研究了不同浓度Cd污水灌溉对芦蒿生长及Cd富集特性的影响。结果表明,芦蒿具有很强的Cd抗性。在Cd污水浇灌下,供试土壤中累积的Cd处理量分别为0.3 mg/kg、1.0mg/kg、5.0 mg/kg、10.0 mg/kg、15.0 mg/kg、20.0 mg/kg、25.0 mg/kg、30.0mg/kg、35、0和40.0 mg/kg(分别记为C1、C2、C3、C4、C5、C6、C7、C8、C9和C10),各处理芦蒿的干物重和根系活力均高于对照;叶绿素a和叶绿素b的质量比大体呈现低Cd(0.3～20.0 mg/kg)处理下增加,高Cd(>20.0 mg/kg)处理下减少的规律;C1(0.3 mg/kg)和C2(1.0 mg/kg)两个处理的类胡萝卜素质量比比对照高,Cd处理水平超过1.0 mg/kg后类胡萝卜素质量比都比对照低,且随着Cd处理量的增加呈现逐渐降低趋势;芦蒿根、茎、叶均有较强的Cd富集性,不同器官Cd质量比从大到小为根、茎、叶,土壤Cd处理量在0.3—40.0 mg/kg内时,根茎叶中Cd累积量随着土壤Cd处理量的提高而增加,且二者呈极显著(p<0.01)正相关关系。在低Cd处理水平下芦蒿地上部分的富集系数大于1,芦蒿如此高的富集系数作为蔬菜来种植是不安全的,控制芦蒿的质量安全是一项具有重大现实意义的工作。The present paper is concerned about the authors＇ investigation over the effects of Cd at different concentrations on the growth of Seleng wormwood and its accumulated characteristic features by way of a pot cultivation to simulated Cd-contaminated sewage irrigation. The concentrations of the sewage prepared by CdCl2·2.5H2O （AR） were 0.00 mg/L, 0.12 mg/L, 0.40 mg/L, 2.00 mg/L, 4.00 mg/L, 6.00 mg/L, 8.00 mg/L, 10.00 mg/L, 12.00 mg/L, 14.00 mg/L and 16.00 mg/L, respectively. The kind of sewage, as a typical case for land irrigation in growing Seleng wormwood during its growing stage. When test was done as a result of Seleng wormwood planting, the concentrations of Cd accumulation in the soil were found to be 0.0 mg/kg, 0.3 mg/kg, 1.0 mg/kg, 5.0 mg/kg, 10.0 mg/kg, 20.0 mg/kg, 25.0 mg/kg, 30.0 mg/kg, 35.0 mg/kg and 40.0 mg/kg, and in turn labeled as CK, C1, C2, C3, C4, C5, C6, C7, C8, C9 and C10. The results of our experiments show that the Seleng wormwood planted in this way is highly resistant to Cd, both in terms of the dry weight and in terms of the root activity in all of the treatments with higher content than CK, and increased Cd content in the soil. In addition, it was found that the content of chlorophyll-a and that of chlorophyll-b tend to be similar, that it would increase when being treated at lower content of Cd （0.3 -20.0 mg/kg） whereas reduce when being treated at higher content of Cd （ 〉 20.0 mg/kg）. Meanwhile, the root, stem and the leaf of Seleng wormwood had strong accumulated reaction to Cd, which can be ordered as follows： root〉 stem 〉 leaf, that is to say, the content of Cd in the root, stem and leaf tend to be higher when the Cd content in the soil rose. Their correlation can be found significant at the level of 0.01, with the coefficients of correlation （r） being 0.905, 0.925, 0.939 and 0.957, respectively. Both the bioaccumulation ability of Cd from soil and the migration ability of Cd in Seleng wormwood proves to be stronger when treated at a lower content of Cd

关 键 词：食品科学 芦蒿 CD 积累特性 模拟污水灌溉 

分 类 号：X53[环境科学与工程—环境工程]