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采用溶液培养法研究不同价态Sb对水稻根生长以及P和Sb交互作用对水稻根系吸收P、Sb的影响.试验结果表明,Sb(Ⅲ)和Sb(Ⅴ)对水稻根生长均有抑制作用,且随着溶液中Sb浓度的提高抑制效应越明显.水稻根系对Sb(Ⅲ)和Sb(Ⅴ)的吸收均可以用Freundich模型较好地模拟.水稻根系对不同价态Sb的吸收有明显差异.当溶液中Sb浓度为10μmol.l-1时,水稻根系对Sb(Ⅴ)的吸收比Sb(Ⅲ)减少70.9%,而Sb浓度为100μmol.l-1时,水稻根系对这两个价态的Sb吸收差异不大.P对水稻根系吸收Sb(Ⅲ)或Sb(Ⅴ)均没有影响.Sb(Ⅲ)可影响水稻根系对P的吸收,但是Sb(Ⅴ)对水稻根系吸收P影响不大.
The effects of different valences of Sb on root growth and P and Sb uptake by rice roots were studied by solution culture method.The results showed that both Sb (Ⅲ) and Sb (Ⅴ) had inhibitory effects on root growth of rice , And the inhibitory effect became more obvious with the increase of Sb concentration in solution.The absorption of Sb (Ⅲ) and Sb (Ⅴ) in rice roots could be well simulated by Freundich model.The absorption of different valences of Sb in rice roots was obvious .When the concentration of Sb in the solution was 10 μmol·L-1, the root absorption rate of Sb (Ⅴ) in rice decreased by 70.9% compared with that of Sb (Ⅲ) However, Sb (Ⅴ) had no effect on the absorption of Sb (Ⅲ) or Sb (Ⅴ) in rice roots. Sb (Ⅲ) could affect the absorption of P in rice roots, Has little effect.