【摘要】 在成都平原绵竹地区选取两种污染程度和酸碱性程度不同的土壤,采用盆栽试验研究了两种螯合剂（柠檬酸和EDTA）对龙葵（Solanum nigrum L.）修复Cd污染土壤和改变土壤pH的影响。结果表明:随着柠檬酸浓度的增加,Cd含量为1.29 mg·kg^-1的高污染土壤（MZT-01）上的植株的生物量均有下降趋势;Cd含量为0.89 mg·kg^-1的低污染土壤（MZT-02）上的植株的生物量则有明显的上升趋势,并在5 mmol·kg^-1时达到最大。在柠檬酸为5 mmol·kg^-1时,龙葵在两种土壤中Cd胁迫下的含量、吸收总量和富集系数均达到最大,植物修复效果最好;浓度为1 mmol·kg^-1的EDTA对龙葵产生了毒害作用,吸收效果低于对照组。螯合剂对中性土壤pH影响较大,pH值从6.35降到5.57,而对酸性土壤基本没有影响。更多还原

【Abstract】 Selected two kinds of soil about different cadmium pollution and different pH in Chengdu Plain Mianzhu Area. A pot culture ex-periment was designed to study the effects of two kinds of chelator（citric acid and EDTA）on Solanum nigrum L. remediation of cadmium polluted soil and the changes of soil pH. The results showed that with the increase of the concentration of the citric acid, the biomass of Solanum nigrum L. in high pollution soil（MZT-01）,whose Cd content was 1.29 mg·kg^-1,was declined; while the biomass in low pollution soil（MZT-02）, whose Cd content was 0.89 mg·kg^-1, was significantly risen and reached a maximum when the citric acid was 5 mmol·kg^-1.When the citric acid was 5 mmol·kg^-1, under the stress of Cd in two kinds of soil, the content, the absorptive amount and enrichment factors of Solanum nigrum L. could rise to the maximum, and the phytoremediation effect was the best. EDTA poisoned Solanum nigrum L. and the absorption effect was lower than the control group when EDTA was 1 mmol·kg^-1. Chelator had a greater influence on pH of the neutral soil,pH from 6.35 to 5.57, but almost had no influence on pH of the acid soil.更多还原