中文摘要：

以黑农38等6个不同基因型大豆为材料，在鼓粒期对豆荚和叶片的面积在主茎上垂直分布、荚皮和叶片的叶绿素含量、光合速率等生理参数进行了研究。结果表明：高产春大豆在鼓粒期间荚面积为叶片面积的19．83％～35．44％，荚皮叶绿素含量为叶片的5．67％～8．20％，荚的真光合速率为叶片的13．32％～55．98％。黑农38的荚面积占叶面积百分比值、叶片的真光合速率均最高，分别为34．85％、26．4μmolCO2·m^-2·s^-1豆荚的真光合速率以吉育67最高，为8．48μmolCO2·m^-2·s^-1，石豆2号最低，为2．24μmolCO2·m^-2·s^-1荚的主要光合生理参数基因型之间的差异大。要进一步提高大豆产量，应发挥鼓粒期荚的光合潜力.

英文摘要：

Taking 6 high-yield soybean cultivars as material,the vertical distribution of pod and leaf area in stem,the physiological parameters of chlorophyll contents, photosynthetic rate （Pn） of pod and leaf in seed-filling period were investigated. Results indicated that the pnd-area accounted 19.83%-35.44% of the leaf-area,pod chlorophyll content and true photosynthetic rale aceonnted 5.67% -9.20% , and 13.32% -55.98 %. Heinong 38 had highest ratio of pod-area to leaf- area and leaf true photosynthetic rate,which was 34.85% and 26.4 μmolCO2·m^-2·s^-1 ,respeetively,For pod true photosynthetie rate, Jiyu 67 was highest of 8.48μmolCO2·m^-2·s^-1 , and Shidou 2 was the lowest of 2.24μmolCO2·m^-2·s^-1. The photosynthetic parameters of soybean pod varied greatly among genotypes, and pod photosynthetic traits in seed - filling period had great potential in improving soybean yield.