不同pH和供Zn条件下HCO_3^-对冬小麦幼苗生长和锌营养的影响  

Effect of Bicarbonate on Zinc Nutrition of Winter Wheat under Different pH and Zinc Supply

作　　者：孙刚[1] 田霄鸿[1] 曹翠玲[2] 刘迎春[1] 李生秀[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学生命科学学院,陕西杨凌712100

出　　处：《土壤通报》2006年第4期716-719,共4页Chinese Journal of Soil Science

基　　金：国家自然科学基金重点项目(30230230);国家重点基础研究发展规划资助项目(G1999011707)资助

摘　　要：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。A solution cultivation experiment with winter wheat seedlings was conducted to study the effect of high HCO3^- concentration （10 mmol L^-1） on wheat growth and zinc uptake at different pH and two Zn supply levels. The results showed that at initial pH 6, HCO3^- could obviously inhibit the growth of roots at Zn deficiency, whereas there was nearly no influence on growth at normal zinc supply. At initial pH of 8, the inhibition of HCO3^- was unobvious to the growth of roots and shoots of the wheat with or without zinc supply, HCO3^- increased dramatically zinc uptake in roots and shoots of the wheat in the acid nutrient solution, especially in the roots, however, HC0f restricted zinc uptake of roots and shoots of the wheat in the alkaline solutions. In addition, HC03 significantly inhibited transport of zinc from the roots to shoots, and thus Zn was mainly accumulated in the roots.. The addition of HCO3^- led to production of small amount of CO3^2- , and maintained the high level to the pH of the nutrient solution.

关 键 词：碳酸氢根 冬小麦 锌营养 营养液培养 

分 类 号：S512.11[农业科学—作物学]