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１９９４年利用￣（１４）Ｃ示踪技术研究了北京小麦不同生育时期光合产物的分配特点。试验结果表明：低密度条件下，多穗型品种群体光合产物向主茎的分配具明显优势，并随生育进程的延续优势越趋突出；光合产物向根系的输入受地上部营养器官生长状况的影响，呈起身期＞开花期＞拔节期；早期光合产物的分配、再分配强度和运转输出率表现为叶片＞叶鞘＞茎节，同主茎相比有效分蘖的物质再分配过程明显滞后，但后期转移迅速、彻底。
1994 ~ ~ (14) C tracer technology to study the Beijing wheat at different growth stages of photosynthate distribution characteristics. The results showed that under the condition of low density, the distribution of photosynthate to the main stem of multi-spike varieties had obvious advantages and became more prominent with the continuation of the growth process. The input of photosynthetic products to the roots was affected by the vegetative growth status The results showed that the distribution of early photosynthetic products, the redistribution intensity and the output rate of operation were leaf> leaf sheath> stem node, and the process of redistribution of effective tillers from the main stem was obviously lagging behind, however, Late transfer quickly and thoroughly.