不同铜污染土壤上海州香薷生长及铜吸收动态

盆栽试验表明,生长期内海州香薷植物体内Cu含量呈现2个随着不同处理中Cu浓度的提高而斜率递增的阶段;海州香薷植株内Cu含量对外界Cu浓度的响应曲线以200mg/kg为转折点,当Cu浓度>200mg/kg时曲线斜率显著增加。在开花初期,Cu400处理污染土壤中Cu清除量达到最大值27.2mg/盆,其污染土壤重金属去除率仅为1.30%。而盛花期,各处理污染土壤中海州香薷植物内Cu含量均明显高于开花初期,Cu400处理污染土壤中Cu清除量达到最大值143mg/盆,其污染土壤重金属去除率达6.85%,与开花初期差异显著(p<0.05)。

Biomass and Copper Contents of Elsholtzia Splendens on Different Copper Contaminated Soils

Along with the increase of Cu concentrations in different treatments, the Cu content in Elsholtzia Splendens Nakai presented two types with different increasing rates during growth stage, and treatment of Cu 200 mg/kg in soil played as a turning point. Plant Cu concentration was positively correlated to soil Cu content when soil Cu concentration was not more than 200 mg/kg. At the early flowering stage, treatment of Cu 400 mg/kg had maximum Cu extraction of 27.2 mg per pot, but its Cu removing rate was only 1.30%. At the blossom stage, plant Cu contents in each treatment were much higher, compared with the early flowering stage. The maximum extraction of Cu reached to 143 mg per pot in the treatment of Cu 400 mg/kg, the removing rate was significantly higher than that at early flowering stage (p<0.05), with the value of 6.85%.