低氮胁迫下不同苦荞品种开花前土壤养分含量特征

为了揭示耐低氮苦荞品种在胁迫环境下的优势，以耐低氮的迪庆苦荞（DQ）和不耐低氮的黑丰1号（HF）为材料，采用盆栽试验研究了开花前低氮胁迫下不同苦荞品种种植后造成的土壤养分含量差异。结果表明:低氮处理下两品种差异显著，HF土壤的含水量、pH值以及全氮含量分别比DQ高33.78%，1.43%，50%，而DQ土壤的NO₃^--N含量、氨氧化酶活性显著高于HF 49.2%，97%。因此，迪庆苦荞可能通过吸收较多的水分、养分来适应低氮胁迫，并且通过提高氨氧化酶活性，加速硝化作用转化出更多的有效态氮供植物吸收利用。所以，对于未来贫瘠土壤上苦荞的种植应考量其耐瘠性的差异，选育耐瘠性强的品种来增加效益。

Characteristics of Soil Nutrient Contents in the Fields of Different Cultivated Varieties of Fagopyrum tataricum Before Flowering Under Low Nitrogen Stress

In order to reveal the advantages of low-nitrogen-resistant varieties of Fagopyrum tataricum under stress conditions, pot experiments were conducted to study the differences in soil nutrient contents of two varieties of Fagopyrum tataricum (DQ, low N resistance and HF, low N sensitive) under low N stress before flowering. The results showed that the two varieties were significantly different under low nitrogen treatment. The soil moisture, pH and total N content in the field of HF were 33.78%, 1.43% and 50% higher than those in the field of DQ, respectively; however, the NO₃^--N content and ammonium oxidase activity in the field of DQ were 49.2% and 97% higher than those in the field of HF. DQ may adapt to the nitrogen stress through the ways of absorbing more water, and convert more available N for plant absorption and utilization by increasing the ammonium oxidase activity. Therefore, the cultivation of Fagopyrum tataricum should consider the differences of varieties in order to increase efficiency on poor soil in the future.