氮素形态对甜菜抗氮胁迫能力的效应研究

试验采用土培和液培相结合的方法，对不同基因型甜菜的抗氮胁迫能力进行了研究，结果表明：1）甜菜对氮胁迫具有多样性，不同基因型甜菜的抗氮胁迫能力具有较大差异（为2－6倍）；2）甜菜的抗氮胁迫能力受外界供给氮素的形态影响较大，参试的6个品种（系）中，对NH4－N胁迫抗性强的，对NH4－N加NO3－N混合营养液胁迫的抗性也强；3）氮素的供给形态左右甜菜的吸收氮特性，但不同基因型的甜菜对3种氮源的反应不一；4）甜菜的抗氮胁迫指数与叶面积、叶绿素含量和全氮量呈显著正相关。

Studies on effect of N applying form on sugarbeet resistance to N stress

By the using of soil pot and liquid culture，the resistance to N stress in different sugarbeet genotypes was studied and the results showed that： 1） sugarbeet has a versatile reactions to N stress，the difference of resistance to N stress ranged from 2～6 times；2） N applying form had a great effect on sugarbeet resistance to N stress，for the 6 varieties （lines） which were used in this study，that had a higher resistance to NH4-N stress，also showed a higher resistance to NO3-N+NH4-N mixed nutrient；3） N applying form regulated N uptake character in sugarbeet，but the reactions of different genotypes showed alarge difference to NO3-N，NH4-N and NO3-N+ NH4-N stress；4） The index of sugarbeet resistance to N stress had a significant positive correlation with leaf area，chlorophyll and total N content.