土壤中铅锰复合污染对烟草生长及其吸收铅和锰的影响

Effects of Combined Mn and Pb Contamination on Growth and Pb and Mn Uptake of Tobacco

采用盆栽试验方法研究Pb与Mn复合污染对烟草生长及其吸收积累Pb、Mn的影响,以便弄清在Pb与Mn复合污染条件下烟草的生长情况。试验结果表明:Pb与Mn复合污染可影响烟草的生长发育,在土壤中Pb浓度(500mg/kg)不变的情况下,随着土壤中Mn浓度的提高,烟草株高、根长、根系和茎叶的干重不断减少,当土壤中Mn浓度达到2500mg/kg时,烟草的株高、根长和烟草的产量减少分别达到极显著水平(p<0.01)。Pb与Mn复合污染也影响烟草对Pb和Mn的吸收与积累,当土壤中Pb浓度不变时,随着土壤中Mn浓度的增加,烟草各部分中Pb含量和Mn含量都在不断的提高。此外,Mn可促进烟草对Pb的吸收与积累。

A pot experiment was carried out to investigate effects of the combined Mn and Pb contamination on growth and Pb and Mn uptake or accumulation of tobacco plants. Results showed that the combined Pb and Mn contamination hindered tobacco growth. When the Pb concentration in the soil was kept at the level of 500 mg/kg, the plant height, root length and root/shoot biomass of tobacco plants decreased, as the Mn concentrations in the soil increased. The biomass of plant height, root length and the output of tobacco decreased with the rise of Mn concentration in the soil and the fall became extremely significant (p < 0.01) when soil Mn reached 2500 mg/kg. Combined Mn and Pb contamination also affected Mn and Pb uptake and accumulation by tobacco. When soil Pb concentration was kept at 500 mg/kg, increasing Mn concentration in the soil, brought up the Mn and Pb concentrations in every part of the tobacco plants. Moreover, the addition of Mn promoted Pb uptake and accumulation in tobacco plants.