稻壳生物炭对矿区重金属复合污染土壤中Cd、Zn形态转化的影响

李洪达; 李艳; 周薇; 吕家珑

文章摘要

李洪达,李艳,周薇,吕家珑.稻壳生物炭对矿区重金属复合污染土壤中Cd、Zn形态转化的影响[J].农业环境科学学报,2018,37(9):1856-1865.

稻壳生物炭对矿区重金属复合污染土壤中Cd、Zn形态转化的影响

Effects of rice-husk-derived biochar on the morphological transformation of Cd and Zn in mining area soils polluted by heavy metals

投稿时间：2018-01-30

DOI：10.11654/jaes.2018-0167

中文关键词: 稻壳生物炭重金属复合污染 Zn Cd 化学形态

英文关键词: rice-husk-derived biochar heavy metal contamination Zn Cd chemical form

基金项目:陕西省科技统筹创新工程计划项目（2016KTZDNY03-01）；陕西省水利科技项目（2016slkj-15）

作者	单位	E-mail
李洪达	西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西杨凌 712100
李艳	陕西省农业环境保护监测站, 西安 710003
周薇	西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西杨凌 712100
吕家珑	西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西杨凌 712100	ljlll@nwsuaf.edu.cn

摘要点击次数: 2134

全文下载次数: 2131

中文摘要:

明确稻壳生物炭的农业生态效应对合理利用其修复矿区重金属复合污染土壤具有重要意义。通过盆栽试验，研究了稻壳生物炭不同施用量（0、5、10、20、50、100 g·kg^-1）对重金属复合污染土壤pH、CEC和Cd、Zn赋存形态转化的影响。结果表明：与对照相比，稻壳生物炭的添加使土壤pH升高0.18~0.29个单位，CEC提高32.89%（5.68 cmol·kg^-1）；同时，重金属复合污染土壤中弱酸提取态Cd、Zn分别降低21.88%、19.63%，氧化态Cd、Zn分别降低24.12%、18.62%，可还原态Cd、Zn分别降低13.72%、8.97%；而使残渣态Cd、Zn分别升高115.56%、39.45%。综上所述，稻壳生物炭的添加提高了矿区重金属复合污染土壤的pH和CEC，促进了重金属复合污染土壤中Cd、Zn的弱酸提取态、可氧化态和可还原态向化学性质稳定的残渣态转化，降低了土壤重金属的有效性，实现了对重金属复合污染土壤的修复。

英文摘要:

Understanding the agroecological effects of rice-husk-derived biochar would provide a reference for its rational application in the remediation of heavy-metal-contaminated soil in mining areas. In the present study, a pot trial was carried out to study the effect of the addition of different concentrations of rice-husk-derived biochar (0, 5, 10, 20, 50, 100 g·kg^-1) on the pH and CEC levels and the morphological transformation of Cd and Zn in heavy-metal-polluted soil. The results indicated that the addition of rice-husk-derived biochar elevated the soil pH and CEC levels by 0.18~0.29 units and 32.89% (5.68 cmol·kg^-1), respectively. In addition, the weak-acid-extractable Cd and Zn were reduced by 21.88% and 19.63%, respectively, and the oxidation states of Cd and Zn were reduced by 24.12% and 18.62%, respectively. The reducible fractions of Cd and Zn decreased by 13.72% and 8.97%, respectively, but the residual fractions of Cd and Zn increased by 115.56% and 39.45%, respectively, compared to those of the control treatments. Overall, the application of rice-husk-derived biochar elevated the soil pH and CEC and promoted transformation of the weak-acid-extractable, oxidizable, and reducible fractions of Cd and Zn into chemically stable residual fractions, which could positively reduce the bioavailability of heavy metals in heavy-metal-polluted soil near mining areas.

HTML 查看全文查看/发表评论下载PDF阅读器