【摘要】 采用温室盆栽试验,研究了不同浓度铅(0、500、1000、1500mg.kg-1)对14种山西省路域优势草本植物生长的影响及其铅吸收积累特征.结果表明:在14种草本植物中,随着铅浓度的增大,反枝苋和高丹草表现出明显的中毒症状,其他12种植物的株高和生物量与对照相比均无显著降低,表现出对铅污染具有一定的耐受性;藜和新麦草植株的地上部铅含量最低,各浓度铅处理下平均值分别为12.70和11.33mg.kg-1,地上部与根的铅含量比(S/R)最低,分别为0.12和0.10,表明二者为低积累植物,可用于铅污染土壤的植被恢复;红叶苋和绿叶苋植株地上部的铅迁移量最高,1500mg.kg-1铅处理下每百株铅迁移总量分别为53.37和45.29mg,可作为修复铅污染土壤的先锋植物.更多还原

【Abstract】 A greenhouse pot experiment was conducted to study the effects of different concentration(0,500,1000,1500 mg·kg-1) lead(Pb) on the growth and Pb absorption and accumulation of 14 roadside dominant herbaceous plants in Shanxi Province.With increasing Pb concentration in the pot,Amaranthus retroflexus and Sorghum bicolor×S.sudanese appeared obviously toxic symptoms,while the other 12 test plants had higher Pb tolerance,with no significant decrease in their plant height and biomass,compared with control.Chenopodium album and Psathyrostachys juncea had the lowest Pb content(averaged 12.70 and 11.33 mg Pb·kg-1,respectively) in their aboveground part and the lowest Pb ratio(0.12 and 0.10,respectively) of aboveground part /root,being the potential low Pb-accumulation plants and able to be used for the vegetation restoration of Pb-polluted soil.Red leaf A.tricolor and green leaf A.tricolor in treatment 1500 mg Pb ·kg-1 had the highest Pb accumulation(53.37 and 45.29 mg Pb per 100 plants,respectively) in their aboveground parts,being able to be chosen as the pioneer plants for the remediation of Pb-polluted soil.更多还原