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《Journal of Anhui Agricultural Sciences》 2008-17
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Dynamic Process of the Morphological Transformation of Cadmium in Soil under Different Moisture Conditions

ZHANG Lei et al(Institute of Agricultural Ecology and Environmental Health,Qingdao Agricultural University,Qingdao,Shandong 266109)  
[Objective] This paper was to investigate the change rules of Cd morphology in soil with time under different water conditions.[Method] A simulated pot experiment was conducted in two water condition(field capacity moisture and saturated-paste regime).The analysis of Cd fractions in soil was by conducted sequential extraction.[Result] When entering into phaeozem,exchangeable Cd content(EX) decreased rapidly at initial stage,and then reached a balance gradually.Carbonate bound fraction Cd(CARB) increased marginally firstly and decreased afterwards,however it did not stabilize in incubation period.Iron manganese oxide bound fraction Cd(IMOB) increased rapidly in first 30 days of incubation,and then tended to be invariable.Residual Cd(RES) increased continuously with time.The reduction of CARB was faster in saturated-paste water regime than in field capacity moisture content regime.IMOB was higher in field capacity moisture content than in saturated-paste regime.[Conclusion] Soil moisture regime affected intensively bioavailability of Cd by altering the redistribution of metal in soil.Compared with field capacity moisture,Cd tended to be stable in saturated-paste regime.
【Fund】: 农业部农业结构调整重大研究专项(04-01-03B);; 青岛农业大学高层次人才启动基金(630638)
【CateGory Index】: X53
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