用营养液培养方法研究了在不同供铁条件下不同形态N和韧皮部烫伤对玉米苗期韧皮部Fe运输的影响。结果表明,韧皮部烫伤提高了玉米根系Fe的再利用,降低了初生叶中Fe的再利用,尤其在缺Fe条件下这种作用更明显,提高和降低的幅度更大。韧皮部烫伤还降低了伤流总量,增加了Fe的浓度。在供应铵态N的条件下,Fe的韧皮部运输比供应硝态N条件下有显著增加,Fe的再利用明显提高。 The effects of different forms of N and phloem scald on the Fe transport in the phloem of maize seedling were studied by nutrient solution culture method. The results showed that phloem scald increased the reutilization of Fe in maize roots and reduced the reutilization of Fe in primary leaves, especially in the absence of Fe, which was more obvious and increased and decreased more. Phloem scald also reduces the total amount of wounds, increasing the concentration of Fe. Under the condition of supplying ammonium N, the phloem transport of Fe significantly increased compared with the supply of nitrate N, and the reuse of Fe was obviously improved.