改良剂对红蛋植物修复污染土壤重金属铅和镉效果的影响

Effect of amendments on phytoremediation of Echinodorus Osiris in the soil contaminated by cadmium and lead

通过盆栽试验研究了在重度重金属混合污染土壤上,施用不同配比的石灰和泥炭(T1,泥炭0 g.kg-1土,石灰2 g·kg-1土;T2,泥炭30 g·kg-1土,石灰0 g·kg-1土;T3,泥炭50 g.kg-1土,石灰0g·kg-1土;T4,泥炭30 g.kg-1土,石灰2g·kg-1土;T5,泥炭50 g.kg-1土,石灰2g·kg-1土)对红蛋(Echinodorus osiris)生长及其去除污染土壤铅、镉量的影响,探讨了化学修复和植物提取修复技术相结合修复重金属污染土壤的可能性。研究结果表明,施用石灰显著提高了土壤pH,施用泥炭不显著;施用石灰和泥炭后土壤中交换态铅、镉含量较CK显著降低,红蛋地上部和地下部铅、镉含量较CK有不同程度降低,T4、T5处理降低不显著;T3、T4、T5处理显著地提高了红蛋的铅单株迁移量和年迁移量,年迁移量分别为CK的2.1倍、2.6倍和2.8倍;T1、T2、T3、T4、T5处理显著地提高了红蛋的镉单株迁移量和年迁移量,年迁移量分别为CK的1.8倍、2.9倍、2.9倍、2.8倍和2.9倍,其主要原因在于施用土壤改良剂改善了红蛋的生长,显著增加了地上部生物量。结合经济效益方面因素考虑,以施用泥炭30g·kg-1土和石灰2g·kg-1土的处理更适合推广运用。

In order to investigate the effect of applications of lime and peat on Echinodorus Osiris growth and removal of Pb and Cd in contaminated soil,5 treatments of different proportions of lime and peat（T1： 0 g·kg^-1 peat and 2 g·kg^-1 lime;T2： 30 g·kg^-1 peat and 0 g·kg-1 lime;T3： 50 g·kg^-1 peat and 0 g·kg-1 lime;T4： 30 g·kg-1 peat and 2 g·kg-1 lime;T5： 50 g·kg-1 peat and 2 g·kg-1 lime） were designed in this pot experiment.The results showed that T1 significantly increased soil pH,but T2 didn’t,T3 decreased exchange-able Pb and Cd in soil significantly,and decreased the contents of Pb and Cd in Echinodorus Osiris shoot and root,but T4,T5 did not significantly;T3,T4 and T5 significantly increased the Pb translocation of single Echinodorus Osiris plant and annual total Pb translocation.Pb annual total translocation of T3,T4,and T5 was 2.1,2.6.and 2.8 times as much of CK respectively.All treatments significantly increased the Cd translocation of single plant and annual total Cd translocation.Cd annual total translocation of T1,T2,T3,T4 and T5 was 1.8,2.9,2.9,2.8 and 2.9 times as much of CK respectively,that was due to the increase of aboveground biomass of Echinodorus Osiris by application of lime and peat.Based on an overall consideration of economic factors,the treatment of com-bine 30 g·kg^-1 peat with 2 g·kg^-1 lime is the best slection for phytoremediation of Echinodorus Osiris in Pb and Cd contaminated soil.