Effects of water management on arsenic and cadmium speciation and accumulation in an upland rice cultivar

查看全文 作　　者：Pengjie [1]Hu;Younan [2]Ouyang;Longhua [1]Wu;Libo [1]Shen;Yongming [3]Luo;Peter [1]Christie

机构地区：[1]Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences;[2]Chinese National Rice Research Institute;[3]Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences

出　　处：《Journal of Environmental Sciences》索引2015年第27卷第1期,共7页

基　　金：supported by the National Natural Science Foundation of China (Nos. 41201300 and 41325003);the High Technology Research Development Program of the People's Republic of China (No. 2012AA06A204) 摘　　要：Pot and field experiments were conducted to investigate the effects of water regimes on the speciation and accumulation of arsenic(As) and cadmium(Cd) in Brazilian upland rice growing in soils polluted with both As and Cd. In the pot experiment constant and intermittent flooding treatments gave 3–16 times higher As concentrations in soil solution than did aerobic conditions but Cd showed the opposite trend. Compared to arsenate, there were more marked changes in the arsenite concentrations in the soil solution as water management shifted, and therefore arsenite concentrations dominated the As speciation and bioavailability in the soil. In the field experiment As concentrations in the rice grains increased from 0.14 to 0.21 mg/kg while Cd concentrations decreased from 0.21 to 0.02 mg/kg with increasing irrigation ranging from aerobic to constantly flooding conditions. Among the various water regimes the conventional irrigation treatment produced the highest rice grain yield of 6.29 tons/ha. The As speciation analysis reveals that the accumulation of dimethylarsinic acid(from 11.3% to 61.7%) made a greater contribution to the increase in total As in brown rice in the intermittent and constant flooding treatments compared to the intermittent-aerobic treatment. Thus, water management exerted opposite effects on Cd and As speciation and bioavailability in the soil and consequently on their accumulation in the upland rice. Special care is required when irrigation regime methods are employed to mitigate the accumulation of metal(loid)s in the grain of rice grown in soils polluted with both As and Cd. 关键词：水分管理巴西旱稻镉形态砷酸积累土壤污染浓度控制生物利用度

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Effects of water management on arsenic and cadmium speciation and accumulation in an upland rice cultivar

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