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• 研究报告 • 上一篇    下一篇

硒镉处理对萝卜硒镉吸收的影响及其交互作用

铁梅1,刘阳1,李华为2,陈忠林1,张莹1,李宝瑞1,韩杰1,薛爽1**   

  1. 1辽宁大学环境学院, 沈阳 110036; 2沈阳师范大学化学与生命科学学院, 沈阳 110034)
  • 出版日期:2014-06-10 发布日期:2014-06-10

Uptake of Se and Cd in radish and their effects on growth.

TIE Mei1, LIU Yang1, LI Hua-wei2, CHEN Zhong-lin1, ZHANG Ying1, LI Bao-rui1, HAN Jie1, XUE Shuang1**   

  1. (1 College of Environment, Liaoning University, Shenyang 110036, China; 2 College of Environmental and Life Sciences, Shenyang Normal University, Shenyang 110034, China)
  • Online:2014-06-10 Published:2014-06-10

摘要: 采用盆栽试验的方法,研究不同含量的硒、镉单一和复合作用对萝卜生长及其对硒、镉吸收的影响。结果表明:适量的硒(2.5~5.0 mg·kg-1)可以促进萝卜的生长,表现为萝卜发芽率提高43%、叶片SPAD值提高22%、生物量增加50%;镉单一污染时,镉显著抑制萝卜的生长(P<0.05);土壤中硒的浓度低于1.5 mg·kg-1时对镉含量<5.0 mg·kg-1具有拮抗作用,同时可以促进萝卜的生长;萝卜中硒的浓度随着土壤中硒的添加量的增加而增加,对硒的富集效果明显,且地下部分对硒的吸收能力大于地上部分;土壤中硒浓度<5.0 mg·kg-1时,5.0 mg·kg-1镉的存在不影响萝卜对硒的吸收;当土壤中硒的浓度为5.0~10.0 mg·kg-1时,镉的存在虽然影响萝卜对硒的吸收,但萝卜中硒的含量仍处于稳定积累状态;而当土壤中硒浓度≥10.0 mg·kg-1时,镉的存在会抑制萝卜对硒的吸收,且这种作用表现为地上部分强于地下部分;硒能显著降低萝卜对镉的吸收,且这种作用表现为地下部分强于地上部分。因此,在轻度镉污染的土壤中种植富硒萝卜,既能生产营养安全的富硒食品,又可实现污染农田的再利用。

关键词: 生物结皮, 全氮, 模拟放牧, 微生物生物量氮, 速效氮

Abstract: The effects of single and compound action of different levels of selenium and cadmium on the radish growth and the absorption of selenium and cadmium were investigated using a pot experiment. The results showed that a moderate amount of selenium (2.5-5.0 mg·kg-1) promoted the growth of radish (43%), representing increases in the germination percentage, the SPAD value of leaf (22%), and biomass of radish (50%). The single pollution of cadmium significantly inhibited the growth of radish (P<0.05). Selenium with a content in the soil below 1.5 mg·kg-1 had an antagonistic action on the effect of cadmium less than 5.0 mg·kg-1, and promoted the growth of radish. The selenium content in radish increased with the increase in level of selenium in the soil and the enrichment of selenium in radish was obvious. The selenium absorption in the underground parts of radish was greater than in the aboveground parts. When the selenium content in the soil was below 5.0 mg·kg-1, the presence of cadmium with the content of 5.0 mg·kg-1 did not affect the selenium absorption of radish. Although the presence of cadmium affected the selenium absorption of radish when the selenium content in the soil ranged from 5.0 to 10.0 mg·kg-1, the selenium content in radish was still in a steady accumulation. When the selenium content in the soil was above 10.0 mg·kg-1, the presence of cadmium inhibited the selenium absorption of radish, which was more obvious for the aboveground parts than for the underground parts. Selenium significantly reduced the cadmium absorption of radish, which was more obvious for the underground parts than for the aboveground parts. Hence planting seleniumrich radish in soil with light cadmium pollution could not only produce safe, nutritious and selenium-rich food, but also realize the reuse of polluted croplands.

Key words: available nitrogen, biological soil crusts, simulated grazing, total nitrogen, microbial biomass nitrogen