汞胁迫对高原牧草生理特征的影响

Effects of mercury stress on physiological characteristics of forage grass in plateau

通过研究不同质量浓度下重金属Hg^(2+)对高原牧草老芒麦和冷地早熟禾胁迫的耐受性,并结合植物修复技术实现重金属的回收,旨在减轻重金属对土壤的破坏。研究采用室温盆栽法,利用不同质量浓度Hg^(2+)(HgCl_(2),0、25、50、75和100 mg/L)和Hoagland水溶液共同处理。研究表明,在不同质量浓度Hg^(2+)胁迫下,冷地早熟禾表现出极强的耐受性,而老芒麦耐受性较弱;此外,冷地早熟禾对重金属的富集能力显著高于老芒麦,且套作冷地早熟禾对重金属的富集能力要高于单作冷地早熟禾。单作冷地早熟禾与套作老芒麦之间的富集能力差异不显著,但均表现出不同程度的富集能力。综合来看,冷地早熟禾可作为重金属污染土壤修复的优选植物,尤其是套作冷地早熟禾对重金属的富集效果最为显著,同时还能改善土壤生态环境。

In order to reduce the damage of heavy metals to soil,the tolerance and the enrichment effect of heavy metal Hg^(2+)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 Hg^(2+)(HgCl_(2),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 intercropping 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 enrichment effect on heavy metals,and can also improve the soil ecological environment.