中文摘要：

为了给西藏高原地区冬小麦氮肥利用效率及生产力水平的提高提供理论支持,利用灰色关联度分析法,对不同施氮水平条件下冬小麦八个农艺性状与产量性状的关联度以及施氮水平与理想施氮量的关联度进行了研究。不同施氮水平条件下,冬小麦农艺性状与产量的关联度按大小排序为穗数〉穗粒数〉小穗数〉株高〉千粒重〉穗长〉生育期〉退化小穗数。西藏拉萨河谷地区冬小麦的最佳施氮水平分布范围大致在150-225 kg.hm^-2;培育大穗品种、提高单位面积成穗数、单穗穗粒数与小穗数则应成为冬小麦生产的主攻目标。

英文摘要：

Based on the application of the gray correlative analysis, the gray correlative degree between eight agronomy properties and yield of winter wheat, and the the gray correlative degree between 5 different levels of fertilized nitrogen quantity and the ideal nitrogen quantity fertilized ,were studied in order to give an academic support to increase the nitrogen use efficiency and the production of winter wheat in the Lhasa River valley in Tibet. Under the conditions of different level of fertilized nitrogen,the sort order of the agronomy properties for winter wheat according to the value of the correlative degree in turn was spike number per hm^2 ,grain number per spike,spikelet number per spike,plant height, weight per 1000 grains, spike length, growth period and invalid spikelet number per spike. The distributing range of the best quantity of fertilized nitrogen for winter wheat probably should be controlled among the quantifies from 150 and 225 kg · hm^-2. As a result, for winter wheat,the main task was to breed variety with bigger splke,and increase the spike number per hm^2 and spikelet number and grain number per spike.