| 硅对土壤外源镉活性和玉米吸收镉的影响 |
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| 引用本文： | 杨超光,豆虎,梁永超,娄运生. 硅对土壤外源镉活性和玉米吸收镉的影响[J]. 中国农业科学, 2005, 38(1): 116-121 |
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| 作者姓名： | 杨超光 豆虎 梁永超 娄运生 |
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| 作者单位： | 1. 南京农业大学资源与环境科学学院,南京,210095
2. 南京农业大学资源与环境科学学院,南京,210095;农业部植物营养与养分循环重点实验室/中国农业科学院土壤肥料研究所,北京,100081 |
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| 基金项目： | 国家自然科学基金资助项目(30170536) |
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| 摘 要： | 通过土培试验，研究了外源硅对土壤镉形态组成的影响，以及与玉米吸镉量的关系。结果表明，经0.1和1.0 mmol·kg-1（以CdSO4·8/3H2O加入）镉处理的土壤加入2.0 g·kg-1 硅酸钠（以Na2SiO3·9H2O加入，pH调至6.0）后可显著减轻镉对玉米的毒害，降低玉米吸镉量。加硅处理显著降低土壤中的交换态和铁锰结合态镉量，但显著提高碳酸盐结合态和残渣态镉的量。硅降低镉对玉米毒害的机制之一是硅改变了根外土壤中镉的形态，降低了镉的活性和生物有效性。
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| 关 键 词： | 镉形态组成 镉毒害 玉米 硅 |
| 收稿时间： | 2004-03-15 |
Influence of Silicon on Cadmium Availability and Cadmium Uptake by Maize in Cadmium-contaminated Soil |
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| YANG Chao-guang,DOU Hu,LIANG Yong-chao,LOU Yun-shen. Influence of Silicon on Cadmium Availability and Cadmium Uptake by Maize in Cadmium-contaminated Soil[J]. Scientia Agricultura Sinica, 2005, 38(1): 116-121 |
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| Authors: | YANG Chao-guang DOU Hu LIANG Yong-chao LOU Yun-shen |
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| Affiliation: | YANG Chao-guang1,DOU Hu1,LIANG Yong-chao1,2,LOU Yun-shen1 |
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| Abstract: | Pot experiments were conducted to investigate the influence of silicon on soil cadmium fractionation and cadmium uptake by maize (Zea may L. Nongda 108). The results showed that Cd toxicity in maize treated with Cd at 0.1 or 1.0 mmol·kg-1 (added as CdSO4·8/3H2O) was significantly alleviated by addition of 2.0 g·kg-1 sodium metasilicate (NaSiO3·9H2O) due to the decreased Cd uptake by maize. The ameliorative effect of Si was due to lower exchangeable Cd and Fe/Mn oxide-bound Cd, and higher carbonate-bound and residual Cd in Si-treated Cd-contaminated soils compared with non-Si-treated ones. One of the possible mechanisms of Si-enhancement of resistance to Cd toxicity is that silicate alters the Cd forms in soil, resulting in reduction of Cd bio-availability. |
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| Keywords: | Cadmium fractionation Cadmium toxicity Maize Silicon |
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