Comparison of a rhizosphere-based method with other one-step extraction methods for assessing the bioavailability of soil metals to wheat
文献类型：期刊论文
| 作者 | Feng, MH; Shan, XQ; Zhang, SZ; Wen, B |
| 刊名 | CHEMOSPHERE
 |
| 出版日期 | 2005 |
| 卷号 | 59期号:7页码:939-949 |
| 关键词 | rhizosphere low-molecular-weight organic acids bioavailability heavy metals in soil wheat |
| 英文摘要 | There is no method recognized as a universal approach for evaluation of bioavailability of heavy metals in soil. Based on the simulation of the rhizosphere soil conditions and integration of the combined effects of root-soil interactions as a whole, a rhizosphere-based method has been proposed. Wet fresh rhizosphere soil was extracted by low-molecular-weight organic acids (LMWOAs) to fractionate metal fractions of soil pools, which were then correlated with the metal contents of wheat roots and shoots. The rhizosphere-based method was compared with other one-step extraction methods using DTPA, EDTA, CaCl2, and NaNO3 as extractants and the first step of the Community Bureau of Reference (BCR) method. Simple correlation and stepwise multiple regression analysis were used for the comparison. Simple correlation indicated that the extractable Cu, Zn, Cr, and Cd of soils by the rhizosphere-based method were significantly correlated with the metal contents of wheat roots. For DTPA, BCR1 and EDTA methods there was a relatively poor correlation between the extractable Cu, Zn and Cd of soil and metal contents of wheat roots. Stepwise multiple regression analysis revealed that the equation of the rhizosphere-based method was the simplest one, and no soil properties variables needed to be added. In contrast, the equations of other one-step extraction methods were more complicated, and soil properties variables needed to be entered. The most distinct feature of the rhizosphere-based method was that the recommended method was suitable for acidic, neutral and near alkaline soils. However, the DTPA and EDTA extraction methods were suitable for calcareous soils only-or-only for acidic soils. The CaCl2, and NaNO3 extraction methods were only Suitable for exchangeable metals. In short, the rhizosphere-based method was the most robust approach for evaluation of bioavailability of heavy metals in soils to wheat. (c) 2004 Elsevier Ltd. All rights reserved. |
| 学科主题 | Environmental Sciences & Ecology |
| 研究领域[WOS] | Environmental Sciences & Ecology |
| WOS记录号 | WOS:000229388600004 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/23155]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Feng, MH,Shan, XQ,Zhang, SZ,et al. Comparison of a rhizosphere-based method with other one-step extraction methods for assessing the bioavailability of soil metals to wheat[J]. CHEMOSPHERE,2005,59(7):939-949. |
| APA | Feng, MH,Shan, XQ,Zhang, SZ,&Wen, B.(2005).Comparison of a rhizosphere-based method with other one-step extraction methods for assessing the bioavailability of soil metals to wheat.CHEMOSPHERE,59(7),939-949. |
| MLA | Feng, MH,et al."Comparison of a rhizosphere-based method with other one-step extraction methods for assessing the bioavailability of soil metals to wheat".CHEMOSPHERE 59.7(2005):939-949. |
入库方式： OAI收割
来源：生态环境研究中心
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