文章摘要
邹富桢,龙新宪,余光伟,黄莉敏,赵仁欣.混合改良剂钝化修复酸性多金属污染土壤的效应——基于重金属形态和植物有效性的评价[J].农业环境科学学报,2017,36(9):1787-1795.
混合改良剂钝化修复酸性多金属污染土壤的效应——基于重金属形态和植物有效性的评价
In-situ remediation of a multi-metal contaminated acid soil using organic-inorganic mixed amendments——Evaluation by heavy metal fractions and phytoavailability
投稿时间:2016-12-27  
DOI:10.11654/jaes.2016-1660
中文关键词: 酸性多金属污染土壤  混合改良剂  植物有效性  沸石  石灰石  磷肥  有机肥
英文关键词: multi-metal contaminated soil  mixed amendments  bioavailability  zeolite  limestone  phosphate fertilizers  organic matter
基金项目:广东省科技计划项目(2012A030700004)
作者单位E-mail
邹富桢 华南农业大学资源环境学院, 广州 510642
广东东篱环境股份有限公司, 广州 510335 
 
龙新宪 华南农业大学资源环境学院, 广州 510642 longxx@scau.edu.cn 
余光伟 华南农业大学资源环境学院, 广州 510642  
黄莉敏 华南农业大学资源环境学院, 广州 510642  
赵仁欣 华南农业大学资源环境学院, 广州 510642  
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中文摘要:
      通过盆栽试验研究了4种由不同剂量的沸石、石灰石、无机磷、有机肥(猪粪或蘑菇渣)组配的混合改良剂对广东省韶关市大宝山周边酸性多金属污染土壤的改良效果。结果表明,4种有机-无机混合改良剂处理后,土壤pH值增加了0.52~1.76个单位,土壤中Pb、Cu、Zn的有效态含量分别比对照土壤降低70.92%~99.29%、69.47%~98.45%、67.22%~99.17%,而且土壤pH值和重金属Pb、Cu、Zn的有效态含量呈显著负相关性。在对照土壤上,菜心和油麦菜的种子发芽和生长显著受到抑制,植株地上部Pb、Cu、Zn含量均高于食品卫生标准。土壤经混合改良剂处理后,菜心和油麦菜生长健康,株高和地上部的生物量显著增加,地上部Pb、Cu、Zn含量显著降低。重金属的化学形态分析结果显示,改良后土壤中的Pb、Cu、Zn可交换态含量明显降低,铁锰氧化物结合态含量提高。因此,4种有机-无机混合改良剂通过提高土壤pH值和促进土壤中Pb、Cu、Zn由可交换态向铁锰氧化物结合态转换,从而达到钝化修复该酸性多金属污染土壤的效果。
英文摘要:
      In this study, a pot experiment was conducted to study the effects of mixed soil amendments containing zeolite, limestone, phosphate rock, and farmyard manure on soil pH and the phytoavailibility of Cu, Zn, and Pb in multi-metal contaminated acid soil collected from the Shangba Village of Shaoguang City in Guangdong Province, China. The results showed that four types of mixed amendments significantly increased soil pH(0.52~1.76) and reduced the bioavailable Zn, Cu, and Pb concentrations in the soil by 70.92%~99.29%, 69.47%~98.45%, and 67.22%~99.17%, respectively. Moreover, there were significant negative correlations between soil pH and bioavailable Cu, Zn, and Pb contents. In the control group(CK), seed germination and growth of Brassica campestris L. and Lactuca sativa L. were all largely inhibited and shoot Zn, Cu, and Pb concentrations were higher than the National Standards for Food Hygiene. However, all the plants were healthy and shoot Pb, Cu, and Zn concentrations significantly decreased in amended soil. Moreover, the heavy metal speciation analysis results showed that the Pb, Cu, and Zn exchangeable concentrations also decreased, while the Fe-Mn oxide-bound concentrations increased in amended soil. Therefore, the application of mixed amendments increased the soil pH and promoted the transformation of heavy metals from the exchangeable fraction to the Fe-Mn oxide-bound fraction, and thus, reduced the bioavailability of heavy metals. The mixed amendments can be used for in-situ remediation of heavy metal-polluted soil in the future.
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