东北半干旱区不同肥力条件下大豆叶片光合速率、气孔阻力的变化

Change of Photosynthesis Rate and Resistance in Soybean Canopy at Diferent Nutritional Levels in Soybean Leaves in Semi-arid Areas of Northeast

根据田间试验资料,分析了3种肥力水平:低肥、中肥、高肥条件下大豆光合速率Pn、气孔阻力Rs在初花期和盛花期的日变化。结果表明,初花和盛花期大豆叶片光合速率、Rs的日变化趋势基本一致,盛花期的Pn明显高于初花期,无论在初花还是盛花期,中肥条件的叶片Pn最大,高肥次之,低肥最低;叶片气孔阻力以中等肥力最低,低肥最高,和光合速率变化趋势非常符合。

Based on the measurement in the field,this paper analyses the different of photosynthesis rate and stomatal resistance at three nutritional levels：low fertilizer,middle fertilizer,high fertilizer at different time of a day in flower period. The result shows,the regularity of phosynthesis rate and stomatal resistance is almost same. The phosynthesis rate in latter flower period is higher than the initial period. In any flower period, the highest Pn is the middle fertilizer,the lowest Pn is the low fertilizer, the lowest R, is the middle fertilizer,the highest Rs is the low fertilizer. The change of resistance is similar to the photosynthesis rate.