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| Effects of limestone, slaked lime and dolomite on cadmium concentration in the solution of paddy rice soils |
| Received:July 25, 2017 |
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| KeyWord:limestone;slaked lime;dolomite;soil;rice;soil solution;cadmium |
| Author Name | Affiliation | E-mail | | GUO Jing-xia | College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | FENG Lian-lian | College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZHANG Qi-jia | College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | LI Yun-yun | College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZENG Tao | College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | WANG Guo | College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China | 1400619353@qq.com |
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| Abstract: |
| In order to better understand the effects of limestone, slaked lime and dolomite on cadmium concentration in the solution of paddy rice soils, a pot experiment was performed using Cd contaminated soil, three amendments(limestone, slaked lime and dolomite), and two rice varieties, Taigeng 8 and Ⅱ-You 3301, aimed to study the dynamic change in water-soluble Cd, soil Eh, pH, TOC, Fe and Mn in soil solution during rice growing period, and the mechanism of the amendments to reduce Cd availability in the soils. The results showed that the solution pH significantly increased, whereas Cd, Fe, Mn and TOC in the solution, and the amount of Fe-plaques on root surface, the Cd in the Fe-plaques and the roots were significantly decreased by the amendments. The water-soluble Cd was significantly and positively correlated with the soil Eh, TOC, Fe and Mn in the solution, while negatively correlated with the solution pH, indicating that the amendments decreased Cd solubility by increasing the soil pH, thereby, inhibiting the reduction-dissolution of Fe/Mn oxides and reduced the soluble organic matter content in the soils. The amendments reduced Fe-plaques on rice roots, and the Cd content in the Fe-plaques, which also decreased Cd uptake by rice roots. The rice varieties were more important than the amendments and the growing time in affecting water-soluble Cd. Among the various factors(pH, Eh, TOC, Fe and Mn contents in soil solutions), water-soluble Fe was the most significant for water-soluble Cd(90 days transplanting). Our results indicated that the effects of the three amendments on Cd concentration in soil solution were similar with each other whereas those on Cd contents in rice roots varied with rice varieties. |
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