丛枝菌根对重金属污染土壤中玉米生长及养分吸收的影响

摘要

为揭示在被重金属Pb、Zn、Cd复合污染的土壤中添加菌根对玉米生物量及营养元素吸收的影响,进行了盆栽试验.结果表明:①接种菌根Glomus mosseae、Glomus intraradices的玉米,地上部生物量受菌根的影响不显著,但根部的生物量分别增长了13.16%和34.21%;根部侵染率达24.14%和25.41%.②接种菌根Glomus mosseae的玉米,其地上部及根部磷浓度与对照组相比提高不显著;而接种菌根Glomus intraradices的玉米,其地上部及根部磷浓度与对照组相比分别增长了16.66%和10.70%;接种菌根Glomus intraradices的玉米,根部吸收的磷有向地上部集中的趋势.③接种菌根Glomus mosseae、Glomus intraradices的玉米,与对照组相比,地上部锰浓度增长不显著,根部锰浓度分别大幅增长了44.93%和53.04%;地上部铁浓度小幅下降,根部铁浓度分别增长为4.15%和37.80%,说明菌根Glomus intraradices能够促进玉米根部吸收Fe;地上部钙浓度分别增长了36.97%和18.50%,根部钙浓度仅小幅增长,根部吸收的钙明显向地上部集中.%In order to reveal the effects of adding mycorrhizal in soil compound contaminated by Pb,Zn and Cd on the bi-omass and nutritions absorption of maize,a pot experiment was carried out. The results show that inoculation Glomus mosseae and Glomus intraradices the effect of maize shoots biomass was not significant,but the maize roots biomass was increased by 13. 16% and 34. 21% respectively. Mycorrhizal infection rates of maize root was increased by 24. 14% and 25. 41% through the treatment of Glomus mosseae and Glomus intraradices. The P concentration of maize shoots and roots was not significantly increased by Glomus mosseae compared with the control groups,but P concentration of maize shoots and roots were increased by 16. 66% and 10. 70% respectively,and the phosphorus of maize roots was moved to the shoots by Glomus intraradices. Com-pared with the control groups,the concentration of Mn in maize shoots were not significantly increased,but concentration of Mn in maize roots were significantly increased by 44. 93% and 53. 04% respectively. Concentration of Fe in maize shoots were slightly decreased,and concentration of Fe in maize roots were increased by 4. 15% and 37. 80% respectively,this shows that the Glomus intraradices could promote Fe absorptions by roots of maize. The concentration of Ca in maize shoots were increased by 36. 97% and 18. 50% respectively through the treatment of the two mycorrhizals,but there were not significant effect in maize roots,and this shows that the calcium in maize roots was significantly moved to the maize shoots.