| .模拟酸雨对空心菜-土壤系统中六价铬迁移转化的影响[J].农业环境科学学报,2013,32(3):. |
| 模拟酸雨对空心菜-土壤系统中六价铬迁移转化的影响 |
| Effects of Simulated Acid Rain on the Migration and Transformation of Hexavalent Chromium in a Water Spinach-soil System |
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| DOI：10.11654/jaes.2013.03.014 |
| 中文关键词: 模拟酸雨 铬 空心菜 迁移转化 |
| 英文关键词: simulated acid rain hexavalent chromium water spinach migration and transformation |
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| 摘要点击次数: 2508 |
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| 中文摘要: |
| 通过盆栽试验，研究了模拟酸雨条件下六价铬在土壤和空心菜之间的分布、迁移和转化规律。结果发现，酸雨处理显著提高了空心菜体内铬的含量，其中空心菜地下部的铬含量显著高于其地上部；空心菜在100 mg·kg-1的铬处理下仍然可以正常生长，但当土壤中的铬达到200 mg·kg-1时，空心菜生长数天后即全部死亡；添加到土壤中的六价铬97.0%以上已经转化成其他形态而留在土壤中，能被植物吸收而迁移的铬量很少，但是酸雨处理促进了铬向植物的迁移，其迁移量是无酸雨时的2.6~5倍；酸雨条件下的空心菜对铬的富集能力提高了，其地上部和地下部对铬的富集系数分别是无酸雨条件下的2.2和4.6倍。该研究结果表明，酸雨增加了作物尤其是根部吸收铬的风险，会进一步加重铬污染地区的农产品安全问题。 |
| 英文摘要: |
| A pot experiment was conducted to study the effects of acid rain on the distribution, migration and transformation of hexavalent chromium in a water spinach（Ipomoea aquatica） soil system. Results showed that the amount of total chromium in water spinach treated with simulated acid rain was significantly higher than those without acid rain. The content of chromium in the underground part of water spinach was significantly higher than it in the aboveground part in treatments with simulated acid rain. While water spinach could survive and grow normally in soil with 100 mg·kg-1 chromium, they couldn’t survive in soil with chromium up to 200 mg·kg-1. Valences of more than 97.0% added hexavalent chromium was changed. The majority portion of the chromium was remained in soil. Only very small portion was absorbed by water spinach. The simulated acid rain could significantly enhance the absorption rate of chromium by water spinach. The amount of absorbed chromium in treatments with acid rain was 2.6 to 5 times as those in the treatments without acid rain. The chromium enrichment coefficients were 2.2 and 4.6 for the aboveground part and the underground part of water spinach respectively by comparing the treatments with and without acid rain. The research result shows that acid rain increases the risk of crop grown in soil contaminated by chromium especially through the absorption of chromium by root system. Hence, agricultural food safety problem in chromium polluted area will be enhanced by acid rain. |
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