应用~(14)C同位素示踪技术,研究耐密型玉米的光合速率和光合产物转运分配规律。结果表明,玉米光合速率在耐密型和普通型之间没有显著差异。在8～16时,光合作用强度较高,光合速率在50～70mgCO_2/dm~2·h,有午睡现象。在12～14时,叶质重增加明显,光合速率与叶质重呈正相关。穗位叶的光合物质,有80%输送给其它组织器官,其中果穗占50%～60%。掖单13比对照丹玉13平均增产18%。耐密型玉米能耐密植,增加了单位面积株穗数,从而获得高产。 The ~ (14) C isotope tracing technique was used to study the photosynthetic rate and translocation of photosynthate in confined corn. The results showed that there was no significant difference between photosynthetic rate and normal type in maize. From 8 to 16 hours, the photosynthesis intensity was higher and the photosynthetic rate was 50 ~ 70 mgCO 2 / dm ~ 2 · h, with a nap phenomenon. From 12 to 14 o’clock, leaf weight increased significantly, photosynthetic rate and leaf weight were positively correlated. Spike leaf photosynthetic substances, 80% delivered to other tissues and organs, of which ears accounted for 50% to 60%. Yeda 13 than the control Dan Yu 13 average yield of 18%. Density-tolerant corn can be densely populated, increasing the number of panicles per unit area to obtain high yield.