供氮对旱作小麦环境适应性的影响

Effects of Nitrogen Supply on Wheat Adaptation to Environment in Dry Land

微区试验结果表明,土壤水胁迫下,增施氮肥可显著提高同一温、湿度下的水分利用率,提高叶片光合对高温的抵抗能力,扩大光合适应的湿度范围。供氮量为90kg/hm2时,可使小麦保持较高的光合速率和水分利用率。

To evaluate the effects of nitrogen supply on wheat adaptation to environment with soil water stress, responses of net photosynthetic rate and water use efficiency under different air temperature and humidity are reported here. Increasing nitrogen application significantly improved the water use efficiency under the same air temperature and humidity. Elevated nitrogen supply increased the ability of wheat to high air temperature and humidity. Net photosynthetic rate and water use efficiency of the nitrogen level 90 kg/hm2 were higher than other levels. 