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| Effects of Different Acidification Methods on Forms and Bioavailability of Cu in Soils |
| Received:June 17, 2014 |
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| KeyWord:soil acidification;copper;forms;bioavailability |
| Author Name | Affiliation | E-mail | | SONG Wen-en | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | GUO Xue-yan | The Middle School Attached to Northern Jiaotong University, Beijing 100081, China | | | CHEN Shi-bao | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | chenshibao@caas.cn | | LI Na | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | |
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| Abstract: |
| The influence of soil acidification on forms and bioavailability of heavy metals in soils has not been understood well. In this study, two types of Cu polluted soils collected from Daye, Hubei(yellow brown soil) and Shouguang, Shandong(alluvial soil) were used to examine the changes of forms and availability of soil Cu under three different acidification treatments, i.e. direct acidification--sulfuric acid(T1), fertilizer acidification--ammonium sulfate(T2) and simulated acid rain(T3). Acidification treatments decreased the biomass of Brassica oleracea L., but increased the shoot Cu concentrations(P<0.05). In alluvial soil, the maximum concentration of the shoot Cu was 1.43 times as much as the minimum, and 1.50 times in yellow brown soil. Soil exchangeable Cu increased significantly with increasing acidification. Compared with the control, 0.1 mol·L-1 MgCl2-exchangeable Cu was up to 10.7%, an increment of 451.5%, in the alluvial soil; while it was up to 12.07%, an increase of 418% in the yellow brown soil. Significant positive correlation was observed between soil exchangeable Cu and the shoot Cu of Brassica oleracea L. with correlation coefficient above 0.80. However, soil exchangeable Cu had a significant negative linear correlation with soil pH [lg(EXC)=-alg(pH)+b], with the slope of -0.314~-0.352.The increase of soil Cu bioavailability by soil acidification followed the order:T3>T2>T1, showing that the bioavailability of heavy metals would be greater in soils acidified by acid rain than in those by fertilizers and industrial wastewater. |
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