| 不同水分条件对蜈蚣草修复砷污染土壤的影响 |
| 摘要点击 2084 全文点击 1159 投稿时间：2015-02-03 修订日期：2015-03-20 |
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| 中文关键词 蜈蚣草 砷 土壤含水量 植物修复 修复效率 |
| 英文关键词 Pteris vittata L. arsenic soil moisture phytoremediation remediation efficiency |
| 作者 | 单位 | E-mail | | 刘秋辛 | 中国科学院地理科学与资源研究所,环境损害与污染修复北京市重点实验室,北京 100101
中国科学院大学,北京 100049 | liuqx.13s@igsnrr.ac.cn | | 阎秀兰 | 中国科学院地理科学与资源研究所,环境损害与污染修复北京市重点实验室,北京 100101 | yanxl@igsnrr.ac.cn | | 廖晓勇 | 中国科学院地理科学与资源研究所,环境损害与污染修复北京市重点实验室,北京 100101 | | | 林龙勇 | 中国科学院地理科学与资源研究所,环境损害与污染修复北京市重点实验室,北京 100101 | | | 杨静 | 中国科学院地理科学与资源研究所,环境损害与污染修复北京市重点实验室,北京 100101 | |
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| 中文摘要 |
| 采用室内盆栽实验研究了不同土壤含水量(绝对含水量10%~60%)对蜈蚣草的生物量、砷富集及蜈蚣草和土壤中砷的形态的影响. 结果表明,土壤含水量35%~45%的范围内蜈蚣草的修复效率显著高于其他处理,可达到4.48%~5.00%. 在此水分区间内,植物细胞的质膜透性较小且植株的生物量较大. 蜈蚣草地上部和地下部的最大干重出现在45% 的含水量下,分别为2.95 g·plant-1和11.95 g·plant-1. 适宜的水分条件利于蜈蚣草吸收和累积土壤中的砷,35%的含水量下植株地上部和地下部的砷含量可分别达到307.3 mg·kg-1和218.6mg·kg-1,而总砷累积量在40%的含水量下达到峰值2.81mg·plant-1. 将土壤含水量控制为35%~45%,还可提高蜈蚣草地上部中As(Ⅴ)的还原效率,促进了蜈蚣草的砷解毒. 研究结果对于蜈蚣草大规模种植和工程应用中的水分管理措施具有重要的指导意义. |
| 英文摘要 |
| A pot experiment was carried out to study the effects of soil moisture on the growth and arsenic uptake of As-hyperaccumulator Pteris vittata L. The results showed that the remediation efficiency of As was the highest when the soil moisture was between 35%-45%. P. vittata grew best under 45% water content, and its aboveground and underground plant dry weights were 2.95 g·plant-1 and 11.95 g·plant-1, respectively; the arsenic concentration in aboveground and roots was the highest under 35% water content, and 40% content was the best for accumulation of arsenic in P. vittata. Moreover, controlling the soil moisture to 35%-45% enhanced the conversion of As(Ⅴ) to As(Ⅲ) in aboveground plant, and promoted arsenic detoxification in P. vittata. These above results showed that soil moisture played an important role in the absorption and transport of arsenic by P. vittata. The results of this study can provide important guidance for the large-scale planting of P. vittata and the moisture management measures in engineering application. |
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