EDDS对Cd、Pb污染下荻生长、重金属积累及修复土壤能力的影响  

Effects of EDDS on Growth,Heavy Metals Accumulation of Miscanthus sacchaiflorus and Its Remediation Capability to Contaminated Soils under Cd,Pb Pollution

作　　者：郑黎明[1,2,3] 张杰[1,2,3] 杨红飞[1,2,3] 袁静[1,2,3] 

机构地区：[1]安徽师范大学生命科学学院,安徽芜湖241000 [2]安徽重要生物资源保护与利用研究重点实验室,安徽芜湖241000 [3]安徽省皖江城市带退化生态系统的恢复与重建协同创新中心,安徽芜湖241000

出　　处：《河南农业科学》2017年第8期61-66,共6页Journal of Henan Agricultural Sciences

基　　金：安徽省自然科学基金项目(1508085QC68);安徽省高校自然科学研究重点项目(KJ2015A127);安徽师范大学创新基金项目(2012CXJJ06)

摘　　要：为初步探明荻与EDDS联合修复重金属污染土壤的可行性,采用盆栽试验,以轻微Cd、Pb污染土壤为培养基质,研究不同添加量[0(对照)、1、3、5 mmol/kg]的乙二胺二琥珀酸(EDDS)对荻生长,Cd、Pb积累及污染土壤修复能力的影响。结果表明:在Cd、Pb污染下,添加EDDS处理荻的光合色素含量、株高和干质量与对照相比总体上均无显著差异,总体上光合色素以5 mmol/kg EDDS处理较好,株高和干质量以3 mmol/kg EDDS处理较好。在Cd污染下,随着EDDS添加量增加,荻地上部、根部Cd含量和富集系数均呈现出先增加后降低的趋势,且均在1 mmol/kg EDDS处理时达到峰值,分别较对照显著提高72.8%、15.4%和73.6%、15.4%,3 mmol/kg EDDS处理次之;Cd转运系数持续增加,且添加EDDS处理均显著高于对照;植株的Cd总积累量呈先增加后减小的趋势,在3 mmol/kg处理时达峰值,较对照显著提高44.2%;添加EDDS处理的Cd转运量系数均高于对照,以5 mmol/kg处理最高;荻对Cd污染土壤的修复效率以3 mmol/kg EDDS处理最高,较对照显著提高44.2%。在Pb污染下,地上部Pb含量和富集系数以5 mmol/kg EDDS处理较大,但与对照无显著差异;根部Pb含量和富集系数在5 mmol/kg EDDS处理时最大,分别较对照显著提高37.5%和35.3%;随着EDDS添加量增加,地上部、根部及总的Pb积累量均表现出先降低后增加的变化趋势,以5 mmol/kg EDDS处理最高,分别较对照提高9.4%、56.7%、46.6%,但差异不显著;荻对Pb污染土壤的修复效率也随着EDDS添加量增加表现出先降低后增加的变化趋势,在5 mmol/kg EDDS处理时最大,较对照提高45.2%,差异不显著。综合分析,在Cd污染下,以3 mmol/kg EDDS处理荻对Cd的富集、积累及土壤修复效果最好;在Pb污染下,以5 mmol/kg EDDS处理荻对Pb积累及土壤修复效果较好,但是效果不是很明显,故EDDS与荻联用修复轻微Cd污染土壤的潜力较大。The effects of different EDDS concentrations [0（ control） ,1 ,3 ,5 mmol/kg] on growth , heavy metals accumulation of Miscanthus sacchariflorus and its remediation capability to contaminated soils were studied under slight Cd,Pb contamination, so as to ascertain the potential of EDDS for the phytoremedi-ation of heavy metals contaminated soils combined with Miscanthus sacchariflorus. The results indicated that on the whole,there were no significant differences between the control and EDDS treatments in photo-synthetic pigments contents, plant heights and dry biomasses under Cd,Pb stress; photosynthetic pigments contents of 5 mmol/kg EDDS treatment was relatively higher,plant heights and dry biomasses of 3 mmol/kg EDDS treatment were relatively higher. Under Cd stress, with the increase of EDDS concentrations, Cd concentration and bioconcentration factor of aboveground, underground parts increased at first and then decreased,reached the maximum values at 1 mmol/kg EDDS, which were 72. 8 % , 15.4 % and 1 3 . 6 % , 15.4% higher than the control, respectively, 3 mmol/kg EDDS was the second; Cd translocation factors increased all the time,all EDDS treatments were significantly higher than the control; total Cd accumula-tion increased at first and then decreased, the maximum appeared at 3 mmol/kg EDDS,which was 44. 2 % higher than the control ; translocation amount factors of different EDDS treatments were significantly higher than the control,and the maximum appeared at 5 mmol/kg EDDS; remediation efficiency of Cd contami-nated soils met the maximum at 3 mmol/kg EDDS,which was 44. 2 % higher than the control. Under Pb stress, the Pb concentrations and bioconcentration factors of aboveground part met the relatively higher value at 5 mmol/ kg, but there was no significant difference compared with control ; Pb concentrations and bioconcentration factors of underground part reached the peak value at 5 mmol/ kg, which were 37. 5 % and 35.3% higher than the control ; aboveground,

关 键 词：荻 镉 铅 乙二胺二琥珀酸 重金属积累 土壤修复 

分 类 号：X53[环境科学与工程—环境工程]