Abstract: In the hydroponic study, zinc-efficient rice genotype IR36 and zinc-ineff icient rice genotype IR26 were employed to investigate the effects of bicarbon ate and high pH on zinc and other nutrients (P, K, Ca, Mg, Fe, Cu, Mn) adsorptio n in rice. As compared with the control, high pH inhibited adsorption, translo cation and accumulation of zinc and other nutrients in both rice genotypes. Howe ver, bicarbonate had little effect on zinc-efficient genotype whereas bicarbona te also decreased zinc and other nutrients adsorption in zinc-inefficient rice genotype. These results implied that increasing rice tolerance to bicarbonate is one of the most important strategies to improve rice adaptation to zinc-defici t in calcareous soil.

Key words: rice, zinc, hydrogen ion exponent, bicarbonate, nutri ent adsorption

摘要： 以IR36（锌高效水稻基因型）和IR26（锌低效水稻基因型）为材料研究了HCO3-（10 mmol/L）和高pH （8.0）对不同锌效率水稻基因型锌以及其他元素（P， K， Ca， Mg， Fe， Cu， Mn）的吸收、运转和积累的影响。与对照相比，高pH对两种基因型水稻锌以及其他元素的吸收、运转和积累都起到了一定的抑制作用；而HCO3-处理条件下，IR26对锌以及其他营养元素的吸收受到明显抑制，IR36则表现出较强的适应性，植株吸收和利用锌等其他元素的能力得到维持，甚至提高。这一研究结果表明，提高水稻对高浓度HCO3-的抗性是在石灰性土壤中提高水稻耐缺锌的重要手段之一。

关键词: 水稻, 锌, 酸碱度, 碳酸氢盐, 养分吸收