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采用砂培培养方法,比较研究两种水分条件和3种供氮形态处理对苗期玉米根、茎鞘、叶生物量干重及其氮、磷、钾含量及分配的影响。结果表明,非淹涝胁迫条件下铵硝态氮混合处理(AN)玉米生物量干重及氮、磷、钾累积量最高;淹涝胁迫条件下铵硝态氮混合处理(ANF)的叶片、总生物量以及硝态氮处理(NF)的根系、叶片和总生物量干重明显降低。淹涝胁迫降低3种氮形态处理叶片氮累积量,明显降低铵硝态氮混合处理和硝态氮处理植株氮、钾累积量,降低磷在铵硝态氮混合处理茎鞘、叶中的分配比例、磷在硝态氮处理根、叶中的分配比例以及钾在铵硝态氮混合处理茎鞘、叶中的分配比例。淹涝胁迫下铵态氮处理(AF)叶片含氮量、植株含钾量呈降低趋势;非淹涝胁迫下铵态氮处理(A)具有相对较高的植株氮、磷含量,且淹涝胁迫对氮、磷、钾在植株不同部位分配的影响相对较低。因此,本试验供应铵态氮苗期玉米具有相对较强的耐淹涝胁迫能力。
Sand culture method was used to compare the effects of two water conditions and three nitrogen forms on the biomass dry weight, nitrogen, phosphorus, potassium content and distribution of maize roots, stem sheaths and leaves at seedling stage. The results showed that under the condition of submerged waterlogging, the dry weight of corn biomass and the accumulation of nitrogen, phosphorus and potassium were the highest under the condition of ammonium nitrate and nitrate mixed treatment (AN) The total biomass and dry matter weight of roots, leaves and total biomass of nitrate treatment (NF) decreased significantly. Under submergence stress, the nitrogen accumulation in three forms of nitrogen decreased, and the N and K accumulation in ammonium nitrate nitrate treatment and nitrate accumulation decreased obviously, and the distribution of phosphorus in the stem, sheath and leaf of ammonium mixed nitrate treatment decreased significantly Proportion, distribution ratio of phosphorus in root and leaf of nitrate nitrogen, and distribution ratio of potassium in stem, sheath and leaf of ammonium nitrate nitrate mixed treatment. Under submergence stress, the content of nitrogen and the content of potassium in the leaves decreased with the increase of ammonium nitrogen content (A) and the submergence Stress affected nitrogen, phosphorus and potassium distribution in different parts of the plant relatively low. Therefore, the experimental supply of ammonium nitrogen seedling stage maize has a relatively strong resistance to submergence and flood stress.