中文摘要：

对新疆旱寒区不同种植密度下冬油菜干物质积累、光合生理及产量进行研究。结果表明,冬油菜群体干物质积累呈现Logistic曲线变化,干物质积累速率呈单峰曲线变化,群体干物质积累随密度增加而增加。种植密度影响冬油菜光合特性及干物质积累,并最终影响产量。种植密度为30×10^4-60×10^4株/hm^2时,随种植密度的增加,冬油菜的光合生理指标提高,进而增加油菜产量,但种植密度高于60×10^4株/hm^2时,随种植密度增加其产量呈逐渐降低的趋势。

英文摘要：

The winter rapeseed dry-matter accumulation,photosynthetic and yield with different plant densities in dry and cold areas of Xinjiang were studied.The results showed the process of the winter rapeseed dry-matter accumulation could be simulated with Logistic curve.Speed of dry-matter accumulation showed a single peak curve.With the increase of density the dry-matter accumulation decreased.Plant density had certain influence on photosynthetic characteristics,dry-matter accumulation and yield of winter rapeseed.Under planting density of 30×10^4-60×10^4 plant/hm^2,the photosynthetic indexes and yield of winter rapeseed increased with the increasing density.But when the planting density was up to 60×10^4 plant/hm^2,the yield reduced with the increased planting density.