Effect of moisture regime on the redistribution of heavy metals in paddy soil

查看全文 作　　者：Shunan [1,2,3,4]Zheng;Mingkui [1]Zhang

机构地区：[1]Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, College of Environmental and Resource Sciences, Zhejiang University, IIangzhou 310029, China;[2]Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China;[3]Key Laboratory of Production Environment and Agro-product Safer Ministry of Agriculture, Tianjin 300191, China;[4]Tianjin Key Laboratory of Agro-environment and Agro-product Safety, Tianjin 300191, China

出　　处：《Journal of Environmental Sciences》索引2011年第23卷第3期,共10页

基　　金：supported by the National Basic Research Program (973) of China (No. 2005CB121104);the National Natural Science Foundation of China (No.41071145) 摘　　要：Sequential extraction procedure was applied to assess the dynamics of solid-phase transformation of added Cu,Pb,Cd,and Hg in a typical Chinese paddy soil incubated under three moisture regimes (75% field capacity,wetting-drying cycle,and flooding).The heavy metals spiked in the soil were time-dependently transferred from the easily extractable fraction (the exchangeable fraction) into less labile fractions (Fe-Mn oxide-and organic matter-bound fractions),and thus reduced lability of the metals.No significant changes were found for the carbonate-bound and residual fractions of the heavy metals in the soil during the whole incubation.Change rate of the mobility factor (MF),a proportion of weakly bound fractions (exchangeable and carbonate-bound) in the total metal of soil,reflected the transformation rate of metal speciation from the labile fractions toward stable fractions.It was found that soil moisture regime did not change the direction and pathways of transformation of metal speciation,but it significantly affected the transformation rate.In general,the paddy soil under flooding regime had higher metal reactivity compared with 75% field capacity and wetting-drying cycle regimes,resulting in the more complete movement of metals toward stable fractions.This might be related to the increased pH,precipitation of the metals with sulfides and higher concentration of amorphous Fe oxides under submerged condition. 关键词：土壤水分状况重金属水稻土再分配连续提取法田间持水量土壤HG 活性组分

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Effect of moisture regime on the redistribution of heavy metals in paddy soil

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