| 闫家普,丁效东,崔良,张磊.不同改良剂及其组合对土壤镉形态和理化性质的影响[J].农业环境科学学报,2018,37(9):1842-1849. |
| 不同改良剂及其组合对土壤镉形态和理化性质的影响 |
| Effects of several modifiers and their combined application on cadmium forms and physicochemical properties of soil |
| 投稿时间：2018-02-03 |
| DOI：10.11654/jaes.2018-0187 |
| 中文关键词: 聚丙烯酰胺(PAM) 镉 生物炭 石灰 生物有效性 |
| 英文关键词: polyacrylamide (PAM) cadmium biochar lime bioavailability |
| 基金项目:国家自然科学基金项目（41101094，41101472） |
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| 摘要点击次数: 2098 |
| 全文下载次数: 2299 |
| 中文摘要: |
| 生物炭和石灰作为土壤钝化剂施用能够有效地降低土壤中重金属的生物有效性，而聚丙烯酰胺（PAM）在改善土壤理化性质方面效果显著。本研究在模拟镉（Cd）污染土壤中单独施加不同改良剂以及其不同组合，比较不同处理对土壤理化性质、Cd的有效性及形态变化的影响。结果表明，石灰、生物炭可以有效钝化土壤中的重金属，土壤有效Cd含量比对照组分别降低了43.69%~57.00%、8.42%~11.83%；石灰与生物炭的组合效果在复配处理中最为显著，使土壤有效Cd的含量降低45.38%~62.22%；但是石灰会使土壤pH增加29.05%~50.90%，对土壤理化性质有一定的负面影响。PAM虽没有显著影响Cd的有效态及形态变化，但却提高了土壤团粒体含量。三者共施能够使土壤中有效态Cd含量降低46.13%~62.48%，并改善土壤结构；从形态分布来看，则明显减弱了弱酸提取态和可还原态Cd比例，难利用态Cd比例显著增加。本研究结果表明，PAM+生物炭+石灰三者共同施用可以在不对土壤性质造成较大负面影响的前提下，有效降低土壤中可利用态Cd含量，这对于重金属污染土壤的钝化修复具有一定的参考价值。 |
| 英文摘要: |
| Lime and biochar application, which are two kinds of amendments, are effective for reducing the bioavailability of heavy metals in soil, and polyacrylamide (PAM) application could improve the soil physical and chemical properties. In this study, amendments of Cd-contaminated soil using these three substances and their mixture treatment were done to investigate the effects on the physical and chemical properties of soil, and the bioavailability and chemical fractions of Cd. The results showed that the application of lime and biochar could promote immobilization of Cd in soil, and that the available Cd content was reduced by 43.69%~57% and 8.42%~11.83%, respectively. The combined effect of lime and biochar application was the most significant, which reduced the soil available Cd contents by 45.38% and 62.22%. However, adding lime had a certain negative effect on the physical and chemical properties of soil; it increased soil pH by 29.05%~50.90%. Although the addition of PAM could not change the chemical fractions of Cd significantly, it increased the content of soil aggregates. The content of available Cd in soils was decreased by 46.13%~62.48% when the three factor combination treatments (PAM+biochar+ lime) were conducted. Furthermore, the weak acid-extractable fractions and reducible fractions of Cd were significantly decreased, whereas the proportions of unavailable Cd were increased. The present results implied that the combination treatment (PAM+lime+biochar) could reduce the bioavailability of Cd in soil without negative impact on soil properties effectively, without negative impacts on soil properties. It would provide a reference value for immobilization and remediation of heavy metals in soil. |
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