摘要： 为了探讨不同形态氮肥在缓解镉对农作物毒害方面所发挥的作用,减少镉对人体健康产生的危害,以辽春10号小麦为材料,采用盆栽方法,模拟镉污染农田,设置了铵态氮(NH4+-N)和硝态氮(NO3--N)两种氮素形态,施氮量个水平,研究了不同施氮量下氮素形态对小麦体内含氮物质的影响.结果表明:镉胁迫下,铵态氮对小麦地上部干质量、地上部氮素积累量和小麦叶片叶绿素含量的促进作用高于硝态氮;而施氮量在10～300 kg/hm2范围内,硝态氮对小麦叶片可溶性蛋白含量和硝酸还原酶活性的促进作用高于铵态氮.

关键词: 镉, 铵态氮, 硝态氮, 施氮量, 小麦

Abstract: In order to study the effects of different forms of nitrogenous fertilizer in alleviating cadmium toxicity to crops,and to reduce the harm of cadmium on human health,the wheat of Liaochun 10 and potted plants were utilized to simulate the pollution of cadmium to farmland. The experiment involved two forms of nitrogen(NH4 + -N and NO3--N) and five levels of nitrogen quantity to research the effects of nitrogen forms in different nitrogen quantity on nitrogenous compounds of spring wheat. The results showed that shoot dry weight,shoot nitrogen accumulation and foliar chlorophylls in NH4 + -N supplied wheat were higher than that of NO3 --N supplied wheat under cadmium stress. At the same time,soluble protein content and NR activity in NO3 --N supplied wheat were higher than in NH4 + -N supplied wheat under the nitrogen quantity between 150 and 300 kg /ha.

Key words: Cadmium, NH4+-N, NO3－-N, Nitrogen levels, Wheat

中图分类号: 

• S12.01