Effects of mercury stress on physiological characteristics of forage grass in plateau
In order to reduce the damage of heavy metals to soil,the tolerance and the enrichment effect of heavy metal Hg2+on Elymus sibiricus and Poa crymophila under different mass concentrations were studied.In this study,pot experiments were conducted at room temperature,different concentrations of Hg2+(HgCl2,0,25,50,75 and 100 mg/L)and Hoagland aqueous solution were used to treat plant.The results showed that under different concentrations of heavy metal stress,Poa crymophila showed strong tolerance ability,while Elymus sibiricus showed weak tolerance.In addition,the enrichment ability of heavy metals in Poa crymophila was significantly higher than that in Elymus sibiricus,and the enrichment ability of heavy metals in intercropping Poa crymophila was higher than that in monoculture Poa crymophila.There was no significant difference in enrichment ability between monoculture Poa crymophila and inter-cropping Elymus sibiricus,but they all showed different degrees of enrichment ability.On the whole,Poa crymophila can be used as a preferred plant for remediation of heavy metal contaminated soil,especially intercropping Poa crymophila has the most significant en-richment effect on heavy metals,and can also improve the soil ecological environment.
heavy metal enrichmentPoa crymophilaElymus sibiricustolerancemonocropping and intercropping
万方数据
维普
