【摘要】 田间系统观测表明，春大麦不同叶位叶片的最高光合速率、平均光合速率、光合持续时间和叶面积大小均有差别，基部叶片的较低。单株总叶面积和单株总光合速率在生育期间均呈单峰曲线，挑旗－抽穗期最高。单株平均光合速率在生育期间变化相对平稳，挑旗－－抽穗期相对高些。单株总光合速率、单株日增重与单株叶面积关系较大。单株干重与单株总光合速率相关性较大。产量与经济系数有很大关系。更多还原

【Abstract】 The study was conducted systematically under field conditions with two cultivars of sp ring barley. The main results are as follows: There were differences in net photosynthetic rate(NPR), mean NPR, green area duration and leaf area of leaves in different leaf position. Over the whole growing season, mean NPR per plant assumed a parabolic curve, reached maximum from flag leaf expanding to head sprouting. The total NPR per plant and dry matter production were closely related to the leaf area per plant. under our experimental conditions, the yield was closely related to harvest index.更多还原