Distributions of rare earths and heavy metals in field-grown maize after application of rare earth-containing fertilizer
文献类型：期刊论文
| 作者 | Xu, XK; Zhu, WZ; Wang, ZJ; Witkamp, GJ |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2002 |
| 卷号 | 293期号:2015-01-03页码:97-105 |
| 关键词 | dose-dependent accumulation heavy metals maize rare earths rare earth-containing fertilizer |
| 英文摘要 | Rare earths are widely applied in Chinese agriculture to improve crop nutrition through the use of fertilizers, yet little is known of their accumulation in field-grown crops. We have studied the distribution of 16 rare earths (Sc, Y and 14 lanthanide elements) in field-grown maize and the concentration of heavy metals in the grains after application of rare earth-containing fertilizer. When maize entered the vigorous vegetation growth stage (e.g. early stem-elongation stage), rare earth-containing fertilizer was applied to the soil with irrigation water. At 10 days after application of the rare earths, significantly dose-dependent accumulative effects of individual rare earth concentrations in the roots and the plant tops of maize were observed, with the exception of Sc and Lu. At the level of 2 kg rare earths ha(-1), accumulative concentrations of most light rare earths (e.g. La, Ce, Pr and Nd) and Gd in the plant tops were much larger than those in the control. Concentrations of individual rare earths in a field-grown maize after application of rare earths decreased in the order of root much greater than leaf > stem > grain. During the maize growth period, selective accumulation of individual rare earths (e.g. La, Ce) in the roots seemed to be in dynamic equilibrium, and the distribution of these elements in the plant tops was variable. At a dosage of less than 10 kg rare earths ha(-1), no apparent accumulative concentrations of individual rare earths appeared in the maize grains. Under the experimental conditions, application of rare earth-containing fertilizer did not induce an increase in the concentrations of heavy metals in the grains. We conclude that the present dosage of rare earths (< 0.23 kg ha(-1) year(-1)) currently applied in China can hardly affect the safety of maize grains in arable soil, even over a long period. (C) 2002 Elsevier Science B.V. All rights reserved. |
| 研究领域[WOS] | Environmental Sciences & Ecology |
| WOS记录号 | WOS:000176589500007 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/23925]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Xu, XK,Zhu, WZ,Wang, ZJ,et al. Distributions of rare earths and heavy metals in field-grown maize after application of rare earth-containing fertilizer[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2002,293(2015-01-03):97-105. |
| APA | Xu, XK,Zhu, WZ,Wang, ZJ,&Witkamp, GJ.(2002).Distributions of rare earths and heavy metals in field-grown maize after application of rare earth-containing fertilizer.SCIENCE OF THE TOTAL ENVIRONMENT,293(2015-01-03),97-105. |
| MLA | Xu, XK,et al."Distributions of rare earths and heavy metals in field-grown maize after application of rare earth-containing fertilizer".SCIENCE OF THE TOTAL ENVIRONMENT 293.2015-01-03(2002):97-105. |
入库方式： OAI收割
来源：生态环境研究中心
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