| 吴文成,陈显斌,刘晓文,宋清梅,李云标,蔡信德.有机及无机肥料修复重金属污染水稻土效果差异研究[J].农业环境科学学报,2015,34(10):1928-1935. |
| 有机及无机肥料修复重金属污染水稻土效果差异研究 |
| Effects of Organic and Inorganic Fertilizers on Heavy Metal Immobilization in Paddy Soil |
| 投稿时间：2015-05-05 |
| DOI：10.11654/jaes.2015.10.013 |
| 中文关键词: 钙镁磷肥 硅肥 有机肥 重金属修复 赋存形态 |
| 英文关键词: calcium magnesium phosphate fertilizer silicon fertilizer organic fertilizer heavy metal immobilization chemical form |
| 基金项目:国家环境保护公益科研专项(201109020);国家重金属污染治理专项——清远市电子废弃物拆解重金属污染治理项目(首期工程) |
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| 中文摘要: |
| 钙镁磷肥、有机肥与硅肥是良好的土壤重金属固化剂,也是常见的有机或无机肥料,非常适合修复重金属污染农田土壤.为筛选出最佳的固化剂及其添加量,对受污染农田的大面积修复提供理论依据与指引,通过室内实验,研究硅肥、钙镁磷肥和有机肥对重金属污染水稻土修复效果、修复后土壤pH值和重金属形态变化.结果表明,硅肥和钙镁磷肥能显著提高土壤pH值,分别添加16 g·kg-1和8 g·kg-1使土壤pH值上升2.65和2.74个单位,添加有机肥pH值上升幅度较小,添加8 g·kg-1仅使pH值上升0.83个单位;三种固化剂对Cd、Cu、Pb和Zn赋存形态造成明显影响,其中添加8 g·kg-1钙镁磷肥将可交换态Cd、Cu、Pb和Zn比例分别减少62.5%、69.0%、69.6%和73.0%,并将其转化为残渣态和有机结合态,修复效果优于硅肥及有机肥. |
| 英文摘要: |
| Calcium magnesium phosphate fertilizer(CMPF), organic fertilizer(OF) and silicon fertilizer(SF) are common fertilizers and are considered as good immobilizers of heavy metals as well. In this study, a laboratory experiment was conducted to evaluate their immobilization efficiencies of heavy metals in a contaminated paddy soil by measuring soil pH and heavy metal forms in treated soil, so as to screen out the best immobilizer and its suitable dose. Results show that SF and CMPF significantly increased soil pH. Specifically, the soil pH was increased by 2.65 and 2.74 units by 4 g·kg-1 soil of SF and 8 g·kg-1 of CMPF, respectively. Adding OF at 8 g·kg-1 increased pH by 0.83 units, showing a lower capacity than applying two others. Three fertilizers showed significant effects on chemical forms of Cd, Cu, Pb and Zn, especially the exchangeable fraction. Adding 8 g·kg-1 CMPF decreased exchangeable fraction by 62.5%, 69.0%, 69.6% and 73.0% for Cd, Cu, Pb, and Zn, respectively, being transformed into the operational defined residual and organic fractions. Overall, the remediation efficiency of CMPF was better than that of SF and OF. The application rate would be 8 g·kg-1 CMPF for contaminated soil. |
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