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| 钝化材料的老化对水稻土中Cd钝化稳定性的影响 |
| Effects of the aging of immobilization materials on the stability of immobilization remediation of Cdcontaminated paddy soil |
| 投稿时间：2020-04-26 |
| DOI：10.13254/j.jare.2020.0218 |
| 中文关键词: 天然海泡石，生物质炭，水稻土，老化，Cd形态 |
| 英文关键词: sepiolite, biochar, paddy soil, aging, Cd fractions |
| 基金项目:国家自然科学基金项目（41877403） |
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| 摘要点击次数: 2207 |
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| 中文摘要: |
| 为揭示钝化材料的老化对土壤镉（Cd）钝化稳定性的影响，选择河池、湘潭、韶关三类酸性水稻土，开展了温室条件下为期308 d的土壤培养试验，每类水稻土均设置1个对照和天然海泡石、生物质炭2个钝化材料处理，研究施用钝化材料后，水稻土中土壤Cd形态变化，以及土壤Cd与铁（Fe）、锰（Mn）、铜（Cu）和锌（Zn）形态变化的相关性。结果表明：施加天然海泡石后，河池、湘潭、韶关的土壤中酸提取态Cd含量在308 d土壤培养期间总体呈先减少后增加趋势；其中河池土壤酸提取态Cd占总Cd比例在0~28 d减少9.0个百分点，在28~308 d增加13.8个百分点；湘潭土壤酸提取态Cd占比在0~7 d减少3.2个百分点，7~308 d增加2.0个百分点；韶关土壤酸提取态Cd占比在0~7 d减少4.4个百分点，在7~308 d增加3.5个百分点。施加生物质炭后，河池、湘潭、韶关的土壤中酸提取态Cd含量在308 d土壤培养期间总体也呈先减少后增加趋势，在0~7 d，三个试验地土壤酸提取态Cd占总Cd比例减少5.5~8.1个百分点，在7~308 d增加3.4~6.6个百分点。与施加天然海泡石相比，施加生物质炭后，河池水稻土中Cd与Fe、Mn赋存形态之间的相关性强。研究表明，施加天然海泡石或生物质炭后，Cd污染程度在安全利用类范围的水稻土（河池、湘潭和韶关水稻土）中Cd均存在再活化、再释放现象，天然海泡石和生物质炭的老化显著影响河池、湘潭和韶关水稻土中Cd的形态分布。 |
| 英文摘要: |
| Three types of acidic paddy soils from Hechi, Xiangtan, and Shaoguan were selected, and a 308 day soil cultivation experiment was performed in a greenhouse to reveal the effects of the aging of immobilization materials on the stability of soil cadmium(Cd) immobilization. Each experiment site was equipped with a control treatment and two treatments with sepiolite and biochar. The experiment was performed to study the changes in soil Cd fractions in the paddy soils of Hechi, Xiangtan, and Shaoguan and the Pearson correlation between the forms of soil Cd, iron(Fe), manganese(Mn), copper(Cu), and zinc(Zn). Results showed that after the application of sepiolite, the content of acid-extractable Cd in the Hechi, Xiangtan, and Shaoguan soils showed downward and upward trends in the early and late stages of soil cultivation, respectively. Specifically, the ratio of acid-extracted Cd to total Cd in the Hechi soil decreased by 9.0 percentage points from 0 to 28 days and increased by 13.8 percentage points from 28 to 308 days. Similarly, the percentage of acid-extracted Cd in the Xiangtan and Shaoguan soils decreased by 3.2 percentage points and 4.4 percentage points from 0 to 7 days, respectively, and increased by 2.0 percentage points and 3.5 percentage points from 7 to 308 days, respectively. The content of acid-extracted Cd in the Hechi, Xiangtan, and Shaoguan soils increased and then decreased similar to that of soil treated with biochar. In 0~7 days, the ratio of soil acid-extracted Cd to total Cd at the three test sites decreased by 5.5~8.1 percentage points and increased by 3.4~6.6 percentage points in 7~308 days. Additionally, compared with the application of sepiolite, the application of biochar was strongly correlated with of Cd, Fe, Mn morphology in the soil. The conclusions were the following:after the application of sepiolite or biochar, Cd in the paddy soils of Hechi, Xiangtan, and Shaoguan was gradually reactivated and re-released; the aging of sepiolite and biochar significantly affected the morphological changes of Cd in the paddy soils of Hechi, Xiangtan, and Shaoguan. |
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