氮肥对旱作小麦光合作用与环境关系的调节

土壤水分胁迫下，测定不同供氮小麦生理指标与环境因子的结果表明，25％的空气湿度是氮对作物调控的下限。在此值以上，增施氮肥可以提高光合速率适应高温和高湿的能力，扩大气孔导度受空气温度和湿度抑制的范围，提高叶片保水能力，从而增强小麦抗旱能力。

Regulation of Nitrogen Nutrition on the Relation Between Environment and Photosynthesis of Winter Wheat on Dry Land

To evaluate the effects of nitrogen supply on adaptation of wheat to soil water stress ,responses of net photosyn the tic rate (Pn) and stomatal conductance (Gs) to air temperature and humidity are reported here.2 5 %air humidity was the lower limit regulated Pn and Gs of wheat leaf by nitrogen .Above 2 5 %air humidity ,increasing nitrogensi gnificantly improved Pnunder the high air temperature and humidity ,and enlarged the range of Gssuppressed by air temperature and humidity .Drought resistance of wheat to soil water stress increased with nitrogen supply .