Effects of pH, Fe, and Cd on the uptake of Fe2+ and Cd2+ by rice

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• 作者：Danqing Liu (1) (2)
  Chunhua Zhang (3)
  Xue Chen (1)
  Yazhou Yang (1)
  Shu Wang (1)
  Yujiao Li (1)
  Hao Hu (1)
  Ying Ge (1) (2)
  Wangda Cheng (4)
  
• 关键词：Iron ; Cadmium ; Accumulation ; Rice ; Rhizosphere
• 刊名：Environmental Science and Pollution Research
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：20
• 期：12
• 页码：8947-8954
• 全文大小：
• 作者单位：Danqing Liu (1) (2)
  Chunhua Zhang (3)
  Xue Chen (1)
  Yazhou Yang (1)
  Shu Wang (1)
  Yujiao Li (1)
  Hao Hu (1)
  Ying Ge (1) (2)
  Wangda Cheng (4)
  
  1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
  2. State Key Laboratory of Soil and Sustainable Agriculture, Nanjing Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
  3. Demonstration Laboratory of Elements and Life Science Research, Laboratory Centre of Life Science, Nanjing Agricultural University, Nanjing, 210095, China
  4. Jiaxing Academy of Agricultural Sciences, Jiaxing, 314016, People? Republic of China
  
• ISSN：1614-7499

文摘

The rhizosphere plays an important role in altering cadmium (Cd) solubility in paddy soils and Cd accumulation in rice. However, more studies are needed to elucidate the mechanism controlling rice Cd solubility and bioavailability under different rhizosphere conditions to explain the discrepancy of previous studies. A rice culture with nutrient solution and vermiculite was conducted to assess the effects of pH, Eh, and iron (Fe) concentration on Cd, Fe fractions on the vermiculite/root surface and their uptake by rice. The solution pH was set from 4.5 to 7.5, with additions of Fe (30 and 50?mg?L?1) and Cd (0.5 and 0.9?mg?L?1). At pH?5.5, the Eh in the rice rhizosphere was higher whereas transpiration, Cd2+, and Fe2+ adsorption on the vermiculite/root surface and accumulation in rice were lower than the other pH treatments. Cadmium addition had no impact on pH and Eh in rice rhizosphere while Fe addition decreased pH and increased Eh significantly. Compared with control, Fe addition resulted in the decrease of rhizosphere Cd, Fe solubility and bioavailability. Higher redox potential in the rice rhizosphere resulted in the decline of transpiration, Cd, and Fe accumulation in the rice tissues, suggesting that the transfer of two elements from soil to rice was depressed when the rhizosphere was more oxidized.