中文摘要：

通过15N标记方法研究氮素的吸收、分配、再分配与油菜早熟的内在关系。研究结果表明，早熟油菜品种中油116（ZY116）生育期比中晚熟油菜品种中双11号（ZS11）短9d，在营养生长期和生殖生长期分别短5d和4d。早熟品种ZY116在全生育期吸收的氮素比中晚熟品种ZS11更多的向籽粒中转移，而中晚熟品种ZS11则是花期吸收的氮素向角果皮中转移的更多，角果期氮素从角果皮转移到籽粒的更少，均达显著水平。早熟品种ZY116在营养生长阶段吸收的氮素在后期的分配速度明显快于ZS11，如ZY116苗期吸收的氮素从花期生长到角果期时再分配速度为3．22mg／d，从角果期生长到收获期时再分配速度为3．71mg／d，而ZS11分别为2．48mg／d和3．10mg／d。

英文摘要：

Abstract： Isotope 15N labeling method was used to study the intrinsic relationship between the precocious of rapeseed （Brassica napus L. ） and nitrogen nutrition including N absorption, distribution and redistribution. Compared to medium - late matured cultivar Zhongshuang 11 （ ZS11 ）, early matured Zhongyou 116 （ ZY116 ） was about 5 days and 4 days shorter in vegetative and reproductive stages respectively, and thus matured 9 days earlier than ZS11. Absorbed nitrogen in whole life of ZY116 transported more to grain than that of ZS11, and less to si- lique in flowering period, and more to grain in podding period. Their differences above reached significant levels. In the later period, redistribution speed of nitrogen absorbed in vegetative growth stage of ZY116 was significantly faster, with the redistribution speed of 3.22mg/d from flowering period to podding, and of 3.71mg/d from podding to harvesting, and the corresponding speeds of ZS11 were 2.48mg/d and 3.10mg/d respectively.