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Zinc and incubation time effect on cadmium chemical fractions in two types of calcareous soil

机译：两种钙质土壤中镉化学级分的锌和孵化时间效应

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摘要

This study was carried out to determine the impact of Zn on Cd fractions in two types of calcareous soil. Data indicate that, based on the soil texture, 64 to 70% of Cd was extracted in the water soluble and exchangeable (WsEx) and Fe-Mn oxide (Fe-MnOx) fractions. The proportion of Cd in WsEx and carbonate (Car) fractions in the sandy clay loam soil was higher than in the clay soil after 8 weeks. All the chemical fractions of Cd increased significantly with increasing Cd levels. As much as 50% of the added Cd was extracted in the WsEx fraction after 2 weeks. Adding Zn as Zn sulphate reduced the concentration of Cd in WsEx, Car and organic matter fractions, and increased the concentration of Cd in the Fe-MnOx and residual fractions. The presence of Zn reduced the concentration of Cd in those fractions that are easily released into the soil solution, from where they can be absorbed by plants.
机译：本研究进行了确定Zn对两种钙质土壤中CD分数的影响。 数据表明，基于土壤纹理，在水溶性和可易换的（WSEx）和Fe-MnOx（Fe-MNOX）级分中提取64至70％的Cd。 在8周后，桑迪壤土土壤中WeSX和碳酸盐（轿车）馏分的比例高于粘土土壤中。 CD的所有化学级分随着CD水平的增加而显着增加。 在2周后，在WESX分数中提取多达50％的添加CD。 添加Zn作为Zn硫酸盐降低了WeSex，汽车和有机物质级分中Cd的浓度，并增加了Fe-MNOX和残留级分中的Cd的浓度。 Zn的存在将容易释放到土壤溶液中的那些级分中的Cd的浓度降低，从植物中可以吸收它们。

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