摘要
用土培试验的方法,比较研究了可生物降解螯合剂EDDS和难生物降解螯合剂EDTA对耐Cu植物海州香薷地上部积累土壤Cu、Pb、Zn和Cd的影响。结果表明,施加5mmol·kg-1EDTA和EDDS可增加海州香薷地上部的Cu、Pb、Zn和Cd的含量和积累量。其中,EDDS比EDTA具有更强的溶解土壤Cu、Zn和增加植物吸收积累Cu、Zn的能力。但对土壤Pb、Cd的溶解及Pb、Cd在植物地上部积累的促进作用,EDTA大于EDDS。
Chemically enhanced phyto-extraction has been proposed as an effective approach to removing heavy metals from contaminated soil through use of high biomass plants. A pot studywas conducted to investigate the potential of Elsholtzia haichowensis in phytotemediation of contaminated soils with the application of non-degradable （EDTA） and biodegradable chelate ：（EDDS）. The results showed that the treatments with EDDS to soil contaminated with Cu and Zn significantly increased the dry mass yields of shoots in the Elsholtzia haichowensis, it was found that EDDS was more effective than EDTA at increasingthe concentrations and total uptake amounts of Cu and Zn in the shoots of Elsholtzia haichowensis. The application of 5 mmol· kg^-1 EDDS to soil significantly increased the concentrations and total uptake amounts of Cu in shootsl with maximum levels of 1 322 mg·kg^-1 Dw and 855μg, respectiveiy, which were 90 and 44 fold higher than that in the corresponding control plants to which chelate had not been applied. The concentrations and total uptake amounts of Zn in shoots were also higher in the plants treated with EDDS than in those treated with EDTA. For Pb and Cd, EDDS was less effective than EDTA. The results of metal extraction with chelates Showed that EDDS was more effective than EDTA at.solubilizing soil Cu and Zn, but for Pb and Cd, that the EDDS was less effective than EDTA.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2006年第1期113-118,共6页
Journal of Agro-Environment Science
基金
江苏省科技厅社会发展计划(Q200347)
教育部高校青年教师奖励计划资助
