节水灌溉条件下夏玉米气孔导度与光合速度的关系

The Relationship Between Stomatal Conductance and Photosynthetic Rate in Summer Maize in Water-Saving lrrigation

以夏玉米为材料，在人工测试坑控制的３个灌水量下，进行气孔导度与光合速度关系的研究：在高中低３个灌水量下各生育期光合速率Ｐ。差异最大的为抽雌──吐丝期，而灌浆期差异最小，Ｐｍ与气孔导度Ｃｓ具有很好的平行关系，同时对不同光照Ｐ与Ｐｍ、Ｃｓ和胞间ＣＯ２Ｃｉ，进行了分析，探讨了气孔对光合速率的调节机制。

With summer maize as the material, the relationship between stomatalcoilductance and Dhotosvnthetic rate in stimmer maize was studied in artificial measuringpits under the controlled three irrigation water levels, The results indicated that tinderthe three irrigation water levels(high,medium and low) Pn difference in each growth anddevelopment stage was the maximum in the silk advancing stage while Pn difference wasthe minimum in the filling stage. Photosynthetic rate and stomatal conductance werefouiid to be in good parallel relationship;meawhile,the relatioiiship between P and Pn,Csin inner cellular gas and CO2 and Ci was analysed. Also, this paper discusses the stom-atal mechanism to regtilate photosynthetic rate.