化控措施强化龙葵修复高镉污染土壤的能力研究  

Effects of chemical control on Solanum nigrum L. remediation to cadmium ( Cd) from seriously-polluted soil

作　　者：于彩莲[1] 刘波[1] 杨莹[1] 秦迎春[2] 

机构地区：[1]哈尔滨理工大学化学与环境工程学院,黑龙江省绿色化工技术重点实验室 [2]东北农业大学资源与环境学院

出　　处：《北京林业大学学报》2013年第5期133-138,共6页Journal of Beijing Forestry University

基　　金：国家自然科学基金项目(20272011);黑龙江省重点科技攻关计划项目(GB06A401)

摘　　要：为了强化龙葵修复高镉污染土壤的能力,研究化控措施对超积累植物龙葵修复镉污染土壤能力的影响。在含量为100 mg/kg的镉污染土壤上,采用盆栽试验方法,通过浸种和叶面喷施相结合的处理方式,研究了质量浓度为5、10、20、40 mg/L的二烷氨基乙醇羧酸酯(DA-6)对龙葵各器官吸收和富集镉状况的影响。结果表明:各组处理均能够促进龙葵对镉的吸收和累积,其中20 mg/L时作用最显著,提高了苗期和成熟期的根、茎、叶和果实质量,同时也增加了镉浓度,使得成熟期根、茎、叶的镉提取量增加了46.33%、28.93%和41.28%(P<0.05);5和10 mg/L DA-6也对茎部质量的增加和成熟期各器官镉提取量作用显著,而40 mg/L DA-6仅对叶部质量和镉提取量起到了一定作用;因此DA-6应用在提高龙葵修复效率的最适宜的浸种和叶面喷施的质量浓度应为20 mg/L。Solanum nigrum L. is known to be one of the hyper-accumulators of cadmium （Cd）, a contaminant, from seriously-polluted soil. In order to enhance the plant＇ s capacity of remediation to cadmium, the chemical control of diethyl aminoethyl hexanoate （DA-6） was tested for the accumulation effects of S. nigrum on Cd from soil. In this study, the soil with a rate of Cd, 100 mg/kg, was prepared for the outdoor pot culture of S. nigrum, and four concentrations of DA-6 （5, 10, 20 and 40 mg/L） were used as different treatments for both soaking of seed and foliage spray. The results showed that Cd absorption and accumulation from soil were increased with DA-6, especially in the 20 mg/L treatment, at this level, not only the dry weights of root, stem, leaf and fruit were improved, but also the Cd concentrations were increased in various organs of seedling and matured plants. The increased extraction rates of Cd were 46.33% in roots, 28.93% in stems, and 41.28% in leaves, respectively compared with the control without any DA-6. In 5 and 10 mg/L treatments, the Cd extractions from different organs were also significantly higher, but only the dry weight of matured stem increased significantly. Finally, at 40 mg/L, Cd extraction and dry weight were improved only in the leaves. Therefore, our data recommend DA-6 at 20 mg/L to treat the seeds and leaves of S. nigrum for the remediation to Cd in its polluted soil.

关 键 词：镉 龙葵 化控措施 DA-6 

分 类 号：X53[环境科学与工程—环境工程]