| 摘要: |
| 在田间试验条件下，研究了不同氮素营养水平时冬小麦对水分胁迫的适应机理和水分利用效果。结果表明，干旱条件下，施氮后，植物叶水势降低，气孔阻力增大，蒸腾速率减弱，抵御干旱的能力增强；净光合速率提高，干物质积累增加；最终使作物单叶水分利用效率和群体水分利用效率分别提高33. 3%～55. 7%和13%。 |
| 关键词: 氮素营养,冬小麦,水分胁迫,水分利用效率 |
| DOI： |
| 分类号:S143.1 |
| 基金项目:国家自然科学基金资助项目(49890330; 39770425) |
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| Effects of N fertilizer on the mechanism of adaptation to water stress and water use of winter wheat |
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| Abstract: |
| The mechanism of adaptation to water stress and water use efficiency of
winter wheat under different N nutrition was studied in the field. The results showed
that applying N fertilizer reduced the leaf water potential and increased the stomatal
resistance, and thus reduced the transpiration rate, therefore it was beneficial to drought
resistance. Owing to the increase of the photosynthetic rate, the accumulation of dry
matter was raised.As a result, the leaf water use efficiency and the colony water use
efficiency were increased by 33. 3%～55. 7% and 13% respectively with the increase of
N rate even in drier conditions. |
| Key words: N nutrition,winter wheat,water stress,water use efficiency |
