Effects Of CO₂Fertilization And Inoculation With AM Fungi On Phytoremediation Of Soil DEHP Pollution

Soil is important to human. However, soil suffers more and morepollution with the economic development. Remediation of polluted soil hasreceived increasing attention in past years. Phytoremediation attracts more andmore attention due to its low cost, little secondary pollution and so on.But lowremediation rate of phytoremediation limits its further application. Therefore,it is neceassry to study how to effectively improve remediation rate ofphytoremediation.In present study, C3plant （green bean） and C4plant （corn） were used toinvestigate effects of CO₂fertilization or/and inoculation with AM fungi onphytoremediation of soil DEHP pollution. Change of plant physiology, DEHPdegradation in rhizosphere and plant uptake to DEHP were determined. Thisstudy will elucidate affect mechanism of CO₂fertilization or/and inoculationwith AM fungi on phytoremediation of soil DHEP pollution, disscuss thepossibility that both measure enhance phytoremediation, and provide referencefor improving remediation rate of phytoremediation.The main results are as follows:（1） Inoculation with AM fungi significantly increased abovegroundbiomass of two plants, decreased the activity of SOD and POD, increased theconcentration of chlorophyll. Apart from20mg/kg DEHP, inoculation withAM fungi also changed the microbial community structure in rhizosphere,increased the activity of phosphatase in rhizosphere, increased plant uptake toDEHP, and reduced the residual DEHP concentration in rhizosphere. Thisindicated that inoculation with AM fungi could increase DEHP degradation insoil.（2） CO₂fertilization increased aboveground biomass of two plants,decreased the activity of SOD and POD, increased the concentration ofchlorophyll, indicating that CO₂fertilization can improve the plant growth.CO₂fertilization also changed the microbial community structure inrhizosphere, increased the activity of phosphatase in rhizosphere, increasedplant uptake to DEHP, and decreased the residual DEHP concentration inrhizosphere. This indicated that CO₂fertilization could accleratephytoremediation of soil DEHP pollution, particular so for C3plant, buteffects on C4plant need further study.（3） Both CO₂fertilization and inoculation with AM fungi increasedplant growth more than single treatment, increased the concentration ofchlorophyll, decreased the activity of SOD and POD. Both CO₂fertilizationand inoculation with AM fungi also increased the activity of phosphatase in rhizosphere, changed the microbial community structure in rhizosphere,increased plant uptake to DEHP, and reduced the residual DEHPconcentration in rhizosphere. This indicated that both CO₂fertilization andinoculation with AM fungi had greater effect on phytoremediation than singletreatment, and could be considered as measure to accelerate thephytoremediation of soil pollution.