摘要： 用盆栽对冬小麦不同生育阶段进行不同程度水分调亏试验结果表明：拔节-孕穗期、抽穗-杨花期和灌浆-成熟3个阶段内土壤相对含水量（RW）上限为40%、50%、0%的水分亏缺均对作物的根冠发育产生了影响，拔节-孕穗期RW40%的水分亏缺处理使株高降低很多，低于不施肥的ck1，复水后也无法恢复。不同生育期的干旱均引起根冠干重的下降，根长则不同，水分亏缺有时会使根长增加，要看具体亏缺程度而定。根系不如冠部对干旱敏感，干旱促进营养物质向根的分配，减少了向冠部的运输，导致根冠比增大，另外，随生育期的推移，干旱对根冠比的影响减小。

关键词: 冬小麦, 生育期, 水分调亏, 根冠比(R/C)

Abstract: Results of pot experiments showed that different water deficit degrees during dif ferent development stages of winter wheat had effect s on its roots and crown obviously. At stage of jointing to booting, when soil relative water content was 40% , reaching to the upper limit of water deficit , the plant heig ht decreased obviously and became shorter than that of no fertilizer treatment ck1, and it could not return to normal after supplying water. All droughts in different stages could make dry weight of roots and crown decreased, but not root length. Root length increased under certain water deficit , which depended on def icit degree. Roots were not as sensitive as crown to water deficit. Drought increased distribution ratio of nutritive matters in roots and prevented them from transporting to crown, which resulted in the increase of R/ C. In addit ion, as growth stage went on the effect of drought on R/ C became slighter.

Key words: Winter wheat, Development stage, Water def icit , R/ C

中图分类号: 

• S51.1+1