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首页> 外文期刊>The Science of the Total Environment >Loss characteristics of Cd in soil aggregates under simulated rainfall conditions
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Loss characteristics of Cd in soil aggregates under simulated rainfall conditions

机译：模拟降雨条件下土壤团聚体中镉的损失特征

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摘要

Soil particles exert a significant influence on the migration of heavy metals in soil and water environments. In this study, a simulated rainfall experiment was conducted to investigate the loss characteristics of cadmium (Cd) from a red soil surface. Two rainfall intensities (50 and 100 mm h(-1)) were considered and the distribution of Cd in different fractions (1, 1-0.25, 0.25-0.05 and 0.05 mm) of aggregates lost from the soil was examined. The result showed that in the artificially polluted soil, the Cd content in different aggregates decreased with particle size, with the lowest Cd content in the 0.05 mm fraction aggregates. In the rainfall experiment, the runoff rate generally increased with the rainfall duration, while the sediment yield rate first increased and then remained stable. The loss rates of various fractions of aggregates in the sediment generally followed the order of (0.05) mm 1-0.25 mm 0.25-0.05 mm (1) mm. The proportions of the 0.05 mm-fraction aggregates were the highest in the loss sediment throughout the entire rainfall process. The lost Cd was transported mainly in the sediment-bound form, while only a very small portion of Cd was lost in the water phase of runoff. High rainfall intensity led to greater Cd loss in runoff. In the lost sediment, the concentration of Cd was higher in the macroaggregates. The phenomenon of Cd enrichment in the fine particles was not observed. Although the concentration of Cd in the 0.05 mm fraction was the lowest, the contribution of this fraction to the total Cd content in the sediments was the highest. (c) 2018 Elsevier B.V. All rights reserved.
机译：土壤颗粒对土壤和水环境中的重金属迁移具有重大影响。在这项研究中，进行了模拟降雨实验，以研究红壤表面镉（Cd）的损失特征。考虑了两种降雨强度（50和100 mm h（-1）），并研究了Cd在土壤中损失的不同聚集体（> 1、1-0.25、0.25-0.05和<0.05 mm）中的分布。结果表明，在人工污染的土壤中，不同团聚体中的Cd含量随着粒径的增加而降低，在<0.05 mm的部分团聚体中Cd含量最低。在降雨实验中，径流率通常随降雨持续时间而增加，而沉积物产水率先增加然后保持稳定。沉积物中各部分骨料的损失率通常遵循（<0.05）mm> 1-0.25 mm> 0.25-0.05 mm>（> 1）mm的顺序。在整个降雨过程中，<0.05 mm的分数聚集体的比例在损失的沉积物中最高。损失的镉主要以沉积物结合的形式运输，而在径流水相中仅损失了很少的镉。高降雨强度导致径流中镉的损失更大。在丢失的沉积物中，大型团聚体中的Cd浓度较高。没有观察到细颗粒中Cd富集的现象。尽管<0.05 mm馏分中的Cd浓度最低，但该馏分对沉积物中总Cd含量的贡献最大。 （c）2018 Elsevier B.V.保留所有权利。

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