中文摘要：

2007—2008年度以98个甘蓝型常规油菜品种（系）为材料,在不施氮肥（N0）和施纯氮150kghm–2（N1）2个处理下,通过测定成熟期不同器官干重、氮素含量,采用组内最小平方和动态聚类方法对供试品种的氮素籽粒生产效率（NUEg）聚类并分析其氮素积累与分配差异。结果表明,不同品种氮素籽粒生产效率差异较大,类型间差异极显著。不同类型品种随着氮素籽粒生产效率增加,产量增加。相关分析表明,氮素籽粒生产效率与成熟期氮素吸收总量之间相关不显著（rN0=–0.0245,rN1=–0.1131）,与成熟期茎秆氮素分配比例（rN0=–0.5941＊＊,rN1=–0.4141＊＊）和果壳氮素分配比例（rN0=–0.6007＊＊,rN1=–0.5374＊＊）呈极显著负相关,与籽粒氮素分配比例（rN0=0.7954＊＊,rN1=0.7239＊＊）呈极显著正相关;与成熟期总籽粒数呈极显著正相关（rN0=0.5945＊＊,rN1=0.5412＊＊）。氮素籽粒生产效率和氮素吸收总量对产量都有显著影响,油菜品种的选育应在一定氮素吸收总量基础上,促进后期氮素从营养器官向籽粒中输送,提高氮素籽粒生产效率,从而达到高产和高氮素利用效率的统一。

英文摘要：

In this study, 98 conventional rapeseed （Brassica napus L.） varieties were grown with N0 treatment （0 kg N ha-1） and N1 treatment （60 kg N ha-1） in 2007-2008. Dry matter weight and content of nitrogen were tested at maturing stage. The rapeseed varieties were classified into six types based on their nitrogen use efficiency for grain production （NUEg） by the MinSSw method. The results showed that differences of NUEg in the varieties used in this study were significant. As NUEg increased, yield increased. The correlation analysis showed that NUEg was not significantly correlated with total amount nitrogen accumulation （rN0= -0.0245, rN1= -0.1131）. NUEg had extremely significantly positive correlation with nitrogen distribution ratios in stems （rN0= -0.5941＊＊, rN1= -0.4141＊＊） and shells （rN0= -0.6007＊＊, rN1= -0.5374＊＊）, but extremely significantly negative correlation with the amount of nitrogen in seeds （rN0=0.7954＊＊, rN1=0.7239＊＊）. NUEg had extremely significantly positive correlation with total number of seeds also （rN0=0.5945＊＊, rN1=0.5412＊＊）. NUEg and total amount of nitrogen accumulation influenced yield significantly. Cultivar breeding should be based on a certain total amount of nitrogen accumulation, and promote nitrogen to transport from vegetative organs to seeds, so as to achieve high yield and high nitrogen efficiency in rapeseed production.