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采用营养液培养法,研究了不同pH和供Zn条件下高浓度HCO3-(10 mmol L-1)对小麦幼苗生长,尤其是对锌营养的影响,结果表明:当营养液起始pH为6时,HCO3-在缺Zn时对小麦根系生长的抑制作用较为明显,而正常供Zn时的影响较小。当营养液起始pH为8时,不论缺Zn还是供Zn,添加HCO3-对根系和地上部均未表现出明显的抑制作用。HCO3-在酸性营养液中能极大促进小麦植株根系和地上部尤其是根系对Zn的吸收,而在碱性条件下则抑制小麦幼苗根系和地上部对Zn的吸收。此外,HCO3-能显著抑制Zn从根系向地上部分的转运,从而造成在根系中的大量积累。HCO3-加入营养液后会生成少量的CO32-,并使营养液pH维持在较高水平上。
The effect of high concentration of HCO3- (10 mmol L-1) on the growth of wheat seedlings, especially on the zinc nutrition was studied by nutrient solution culture. The results showed that when the initial pH of nutrient solution was 6 HCO3- inhibited the root growth of wheat in the absence of Zn, while the effect of Zn on the growth of wheat was less. When the initial pH of the nutrient solution was 8, no matter Zn or Zn was added, adding HCO3- did not show significant inhibition on roots and shoots. HCO3- in acidic nutrient solution can greatly promote the Zn uptake by roots and shoots, especially in the roots of wheat plants, whereas Zn inhibited the uptake of Zn by roots and shoots of wheat seedlings under alkaline conditions. In addition, HCO3- significantly inhibited Zn transport from the root to the shoot, resulting in a large accumulation in the root system. HCO3- added to the nutrient solution will generate a small amount of CO32-, and to maintain the nutritional liquid pH at a high level.