| 组配改良剂对污染稻田中Pb、Cd、Cu和Zn钝化效果持续性比较 |
| 摘要点击 3043 全文点击 1452 投稿时间：2015-12-21 修订日期：2016-02-24 |
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| 中文关键词 稻田土壤 组配改良剂 重金属 持续性修复 水稻 |
| 英文关键词 paddy soil combined amendment heavy metal remediation persistence rice |
| 作者 | 单位 | E-mail | | 吴玉俊 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | 897736522@qq.com | | 周航 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 杨文弢 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 邹紫今 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 朱维 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 辜娇峰 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 彭佩钦 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 张平 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 曾敏 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 廖柏寒 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | liaobh1020@163.com |
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| 中文摘要 |
| 为研究组配改良剂碳酸钙+海泡石(LS)对稻田土壤重金属Pb、Cd、Cu、Zn钝化效果的持久性,通过一次性施用0、2、4、8 g·kg-1的LS,并分别于2012年(第一季)、2013年(第二季)和2014年(第三季)连续种植水稻,在湘南某矿区附近污染稻田进行了一个3 a的大田修复试验.结果表明:①LS能显著提高三季土壤pH值,且LS对土壤pH值提高效果为:第一季>第二季>第三季.②LS能显著降低三季水稻土壤中Pb、Cd、Zn的交换态含量,且第三季水稻土壤中Pb、Cd、Zn的交换态含量分别降低32.6%~97.7%、8.3%~71.4%和10.9%~83.5%,但对降低三季土壤中Cu的交换态含量无显著影响; LS降低三季土壤中Pb、Cd、Cu、Zn交换态含量的效果均为:Pb > Zn > Cd > Cu.③LS使第三季水稻糙米中Pb和Cd含量分别降低26.7%~66.7%、59.1%~80.3%,这种降低效果均随着改良剂LS添加量的增加而增大,但对糙米中Cu和Zn含量无明显影响.LS降低糙米中Pb、Cd、Cu、Zn含量的效果为:第一季,Pb > Cd > Cu > Zn;第二季,Pb > Cd > Cu > Zn;第三季,Cd > Pb > Zn > Cu.LS降低三季水稻糙米中重金属含量的整体效果为Pb > Cd > Cu > Zn.④随着时间的延长,LS对土壤中Pb和Cd具有更稳定的钝化效果.因此,LS对治理Pb和Cd污染的土壤具有良好的持久性. |
| 英文摘要 |
| A three-year in-situ experiment was conducted in a paddy soil near a mining area in southern Hunan in order to study the persistence of combined amendment of limestone+sepiolite (marked as LS) stabilizing Pb, Cd, Cu and Zn in polluted paddy soil. LS with ratios of 0, 2, 4, and 8 g·kg-1 was applied once to the paddy soil, and rice was subsequently planted for three consecutive years of 2012 (first season), 2013 (second season), and 2014 (third season). The experimental results indicated that:①LS significantly increased soil pH values for all three seasons, and the enhancement ranked as follows:first season > second season > third season. ② LS obviously decreased the exchangeable contents of soil Pb, Cd and Zn for all three seasons, and the decreasing magnitude of exchangeable contents of soil heavy metals was 32.6%-97.7% for Pb, 8.3%-71.4% for Cd, and 10.9%-83.5% for Zn, respectively, in the third season; however, there was no significant decrease for Cu. The effects of LS decreasing exchangeable contents of soil heavy metals in three seasons followed the order of Pb > Zn > Cd > Cu. ③ LS decreased contents of Pb and Cd in brown rice in the third season by 26.7%-66.7% and 59.1%-80.3%, respectively, and the reduction trend increased with increasing LS application. Cu and Zn contents in brown rice did not decrease effectively. The effect of LS reducing contents of Pb, Cd, Cu and Zn in brown rice followed the order of Pb > Cd > Cu > Zn for the first season and the second season, but Cd > Pb > Zn > Cu for the third season. For all three seasons, the total effect of LS reducing heavy metal contents in brown rice followed the order of Pb > Cd > Cu > Zn. ④ The effect of LS stabilizing soil Pb and Cd emerged gradually with time. Therefore, LS was suitable for remedying soil polluted with Pb and Cd for a relatively long time because of its persistence. |
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