用￣（１４）Ｃ示踪方法对鄂棉１４、鄂棉１６及鄂荆１号三个棉花品种叶片的光合速率及（１４）￣Ｃ－光合作用产物的分配进行了比较研究，结果是：苗期、蕾期鄂荆１号光合能力最强，鄂棉１４次之，鄂棉１６最弱，铃期鄂棉１６与鄂荆１号的光合能力相接近；铃期￣（１４）Ｃ－光合产物分配到生殖器官的量，鄂荆１号占总输出的３４．０７％，鄂棉１６占３２．５３％，鄂棉１４占２５．５１％；鄂棉１４营养生长转入生殖生长较鄂棉１６及鄂荆１号迟。 The photosynthetic rate and the distribution of (14) C-photosynthetic products in three cotton cultivars of Emeian 14, Emeian 16 and Jingjing 1 were compared by using (14) C tracer method. The results were as follows: The photosynthetic capacity of the seedlings at the seedling stage and the bud stage of Jing-1 was the strongest, that of the E-cotton was 14 times, that of the E-cotton 16 was the weakest, and that of the E-cotton 16 was similar to that of the Jing- Photosynthesis products assigned to the amount of reproductive organs, the total output of Hubei Jing 1 No. 34.07%, E cotton 32 accounted for 32.53%, E cotton 14 accounted for 25.51%; E Mian 14 vegetative growth into reproductive growth than Emeian 16 and Jing-1 late.