Tolerance And Enrichment Of Paspalum Notatum,Eragrostis Curvula And Vetiveria Zizanioides In Cu-Zn Single Contaminated Soil

In this study,Paspalum notatum,Eragrostis curvula and Vetiveria zizanioiaes were used to test potted plants in the greenhouse of Jiangxi Institute of Red Soil.The experiment was divided into Paspalum notatum,Eragrostis curvula and Vetiveria zizanioiaes on the tolerance and enrichment of Cu and Zn single pollution soil.In the study of the tolerance and enrichment of Paspalum notatum,Eragrostis curvula and Vetiveria zizanioiaes under Cu single pollution soil,the concentration of Cu²⁺ added to the soil was set at 0,50 mg/kg,150 mg/kg,300 mg/kg,450 mg/kg on April 8,2016 and 25 mg/kg,75 mg/kg,100 mg/kg on May 13,2016.In the study of the tolerance and enrichment of Paspalum notatum,Eragrostis curvula and Vetiveria zizanioiaes under Zn single pollution soil,the concentration of Zn²⁺ added to the soil was set at 0,100mg/kg,300mg/kg,500mg/kg,700mg/kg.By studying of the tolerance feature of Cu²⁺,Zn²⁺?trauma symptoms,plant height,biomass,chlorophyll content and relative conductivity?and the enrichment capacity(Cu²⁺,Zn²⁺content,translocation factor,cumulant of Cu²⁺,Zn²⁺ and bioaccumulation factor)in Paspalum notatum,Eragrostis curvula and Vetiveria zizanioiaes.The main findings are as follows:?1?The plants transplanted on April 8,2016,under the single stress of Cu²⁺ were the best in the control group,and the growth of Cu²⁺ was 25mg/kg on May 13,2016 the best.The growth rate of Zn²⁺ was 100mg/kg and the concentration of Zn²⁺ was 100mg/kg and300mg/kg,and the growth rate of Zn²⁺ was 100mg/kg.?2?Eragrostis curvula,which was transplanted on April 8,2016,was the highest in the control group.The Vetiveria zizanioiaes was the highest with the addition of Cu²⁺ at50mg/kg and moved on May 13,2016 Planted Eragrostis curvula with Cu²⁺ added to the highest 75mg/kg group,Vetiveria zizanioiaes to Cu²⁺ added amount of 25mg/kg as the highest.The amount of Zn²⁺ was 100mg/kg under the single stress of Zn²⁺,and the highest amount of Zn²⁺ was 500mg/kg,which was not significantly different from that of the control group?P <0.05?.?3?The biomass of Cu²⁺ under single stress was the highest in the control group on April 8,2016.The plant was transplanted on May 13,2016,with the addition of Cu²⁺ as25mg/kg maximum.Under the single stress of Zn²⁺,the biomass was the largest in the control group,and the root / shoot ratio was less than 1.?4?The plants transplanted by chlorophyll in Cu²⁺ under single stress on April 8,2016 were the highest with the addition of Cu²⁺ at 50mg/kg,and the plants transplanted on May13,2016 were 25mg/kg maximum.Under the single stress of Zn²⁺,Paspalum notatum andVetiveria zizanioiaes were the highest with the addition of Zn²⁺ 500mg/kg,and Eragrostis curvula was the highest at 100mg/kg.?5?The plants with the relative conductivity of Cu²⁺ under the single stress of April 2,2016 were the highest with the addition of Cu²⁺ at 450mg/kg,and the plants transplanted on May 13,2016 were 100mg/kg is the largest.Under Zn²⁺ single stress,500mg/kg was the highest.?6?The Cu²⁺ content in the aerial part of Cu²⁺ and Zn²⁺ was less than that of the underground Cu²⁺,and the transfer coefficient was less than 1.?7?The Zn²⁺ content in Cu²⁺ and Zn²⁺ singleton was higher than that in the underground part under Cu²⁺ and Zn²⁺ single stress.The Zn²⁺ content was more than 1under Cu²⁺ single stress.Under Zn²⁺ single stress,the content of Zn²⁺ was lower than that of underground,except for Paspalum notatum in the control group was greater than 1,other plants were less than 1 in other treatments.?8?The Cu²⁺ and Zn²⁺ accumulation of Paspalum notatum,Eragrostis curvula and Vetiveria zizanioiaes had different effects on the accumulation of Cu²⁺ or Zn²⁺ under Cu²⁺and Zn²⁺ single stress.The accumulation of Cu²⁺ or Zn²⁺ was higher than that of the underground part.?9?The enrichment coefficient of Cu²⁺ or Zn²⁺ in Cu²⁺ or Zn²⁺ under Cu²⁺ single stress was the highest at 150 mg/kg of Cu²⁺ in Pasalum notatum transplanted on April 8,2016.Eragrostis curvula was added at 50 mg/kg Cu²⁺ The maximal,Vetiveria zizanioiaes was the largest in the control group;Paspalum notatum transplanted on May 13,2016 was the largest at the concentration of Cu²⁺ at 75 mg/kg,and Eragrostis curvula and Vetiveria zizanioiaes were the most concentrated at Cu²⁺ at 25 mg/kg.The enrichment coefficient of Cu²⁺ and Zn²⁺ in Cu²⁺ and Zn²⁺ groups was affected by Zn²⁺ single stress.The enrichment coefficient of Cu²⁺ and Zn²⁺ was basically lower than that of underground part.In summary,Paspalum notatum,Eragrostis curvula and Vetiveria zizanioiaes are not hyperaccumulators of Cu²⁺ or Zn²⁺.However,when Cu²⁺ or Zn²⁺ is the main pollutant in soil,the content of Cu²⁺ in the soil is 0 187.65mg/kg or the total Zn²⁺ content is 0 ⁵83.53mg/kg can be given priority to plant Paspalum notatum,or Paspalum notatum and Vetiveria zizanioiaes mixed cultivation.