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作 者 ：邹春琴;李春俭;张福锁;毛达如

期 刊 ：植物营养与肥料学报 1996年 2卷 3期 页码：219-225

关键词：氮素形态；缺铁；微量元素；玉米；

摘 要 ：用营养液培养方法研究了铁和两种形态氮素对玉米植株吸收铁、锰、铜、锌等微量元素及其在体内分布的影响。结果表明:与硝态氮(NO₃^--N)相比,铵态氮(NH₄⁺-N)显著提高了玉米对铁的吸收,降低了对锰、铜及锌的吸收。供铁也明显提高了植株地上部铁的吸收总量,降低了锰及锌的吸收量,尤其是在供应No₃^--N时这种作用更为明显。在缺铁条件下,NH₄⁺-N处理的玉米新叶中铁的含量明显高于NO₃^--N处理;而新叶、老叶、茎中锰、锌、铜含量以及根中锰、锌含量都明显低于NO₃^--N处理。但使用NH₄⁺-N时,根中铜的含量较高。在供铁条件下,NH₄⁺-N处理的玉米植株四个不同器官中锰和锌的含量显著低于NO₃^--N处理的植株,而铜的含量正好相反。在缺铁条件下,玉米新叶中活性锰、活性锌的含量显著高于供铁处理;与NO₃^--N相比,NH₄⁺-N的供应也显著降低了玉米新叶中活性锰以及活性锌的含量。

Abstract:The effects of Fe and two forms of nitrogen on uptake and distribution of microelements in corn plants was studied in nutrient solution under controlled conditions. The results demonstrated that Fe supply improved Fe content in young leaves obviuosly and decreased Mn, Zn content in young leaves no matter what kind of nitrogen was supplied. At the same time, different forms of nitrogen could also influence the contents of Fe, Mn, Cu, Zn in plants. Compared to NO₃^--N, NH₄⁺-N supply could improve Fe content in young leaves and decrease Mn, Zn, Cu content under Fe-deficient condition. Though there was lower Fe content in the roots of NH₄⁺-N fed plants comparing to NO₃^--N supply, there was higher Fe content in young leaves. Moreover, Fe and NH₄⁺-N supply decreased the contents of active Mn and Zn in young leaves of corn plants. The influence of iron and nitrogen supply on contents and distribution of Fe, Mn. Zn and Cu in old leaves, stem and roots was also discussed.

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