铅对14种本土草本植物根系生长及根系活力的影响

Effects of Pb on Root's Growth and Activity of 14 Native Herbaceous Plants

采用温室盆栽试验,研究了不同质量浓度铅对山西省14种本土草本植物根系生长及根系活力的影响。结果表明,藜、新麦草、红叶苋和紫花苜蓿为一类,属于铅高耐性植物,其根长、根系生物量、根系活力在各处理下均高于对照;紫苑、反枝苋和高丹草为一类,属于铅敏感植物,1 500mg/kg铅处理下,根长、根系生物量、根系活力均显著低于对照(P<0.05);其余7种植物对铅的耐性介于上述二类植物之间。这一结果将为铅污染土壤的生态恢复提供一定的理论依据。

A greenhouse pot experiment was conducted to study the effects of Pb on root＇s growth and activity of 14 native herbaceous plants in different Pb treatment（0,500,1 000,1 500 mg/kg）.The results showed that Chenopodium album,Psathyrostachys juncea,Amaranthus tricolor of ＇red leaf＇ and Medicago sativa are highly tolerant to Pb.Root length,root＇s biomass and activity are all higher than control.Aster tataricus,Amaranthus retroflexus and Sorghum bicolor×S are sensitive to Pb.Root length,root＇s biomass and activity are significantly lower than control in 1 500 mg/kg Pb treatment.Tolerance to Pb of other 7 plants are between the two kinds of plants.The result will provide theoretical basis of ecological restoration in Pb-polluted soil.