| 镉污染土壤生物质炭修复的化学稳定机制 |
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| 引用本文： | 杨亚鸽,崔立强,严金龙,丁成.镉污染土壤生物质炭修复的化学稳定机制[J].安徽农业科学,2013,41(5):2044-2046,2057. |
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| 作者姓名： | 杨亚鸽 崔立强 严金龙 丁成 |
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| 作者单位： | 盐城工学院环境科学与工程学院,江苏盐城224051;江苏大学环境学院,江苏镇江212013;盐城工学院环境科学与工程学院,江苏盐城,224051 |
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| 基金项目： | 江苏省六大人才高峰项目，盐城工学院人才引进项目 |
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| 摘 要： | 以不同生物质炭添加量修复稻田土壤为研究对象,采取三步连续提取法对3年来土壤中镉元素的形态分布特征及其变异规律进行了系统分析。结合土壤理化性质,探讨了镉污染稻田生物质炭修复的化学稳定机制。结果表明,在生物质炭修复2、3年后,与对照相比土壤pH分别提高了0.16～0.65单位和0.26～0.60单位;土壤有机质分别提高了26.2%～50.4%和29.2%～51.2%;镉的赋存形态由有效态向潜在有效态或无效态转变,酸溶态分别降低了5.9%～37.6%和21.7%～27.3%;40 t/hm2处理强度土壤镉的氧化态和残渣态分别升高了126.7%和64.2%,显著降低镉污染的生物可利用性和生态毒性。该研究结果能够为深入探讨生物质炭修复机制提供理论依据,并且为生物质炭在重金属污染土壤中的农业应用提供技术支撑。
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| 关 键 词： | 生物质炭 镉 BCR 水稻土 修复 |
Chemical Mechanism in Amendment of Cadmium Contaminated Paddy Soils by Biochar |
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| Institution: | YANG Ya-ge et al(School of Environmental Science and Engineering,Jiangsu University,Yancheng,Jiangsu 224051) |
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| Abstract: | The cadmium contaminated paddy soils amended with different amount of biochar were used as the research subject,and the distribution and variation of the speciation of cadmium were studied by BCR method.The chemical stability mechanism was also discussed.Results showed that the soil pH was increased by 0.16%-0.65% and 0.26%-0.60% units in the year of 2011 and 2012,respectively.Soil organic matter(SOC) has significantly increased by 26.2%-50.4%(2011),29.2%-51.2%(2012).After biochar was applied,acid dissolved state of cadmium was decreased by 5.9%-37.6%and 21.7%-27.3%and reduction state by 14.8%-35.2%(2011) and 6.3%-26.1%(2012),but oxidation and residual state were increased by 126.7%(2011) and 64.2%(2012) with 40 t/hm2 biochar application.From the results,we found that the state of Cd transformed from bioavailability to residual state with biochar application,so we hoped that this paper provided a theoretical and technical support for biochar amendment the Cd contaminated soil. |
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| Keywords: | Biochar Cd BCR Paddy soil Amendment |
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