摘要： 用玻璃管观测法研究了四个春小麦品种在不同施氮肥水平下和在无灌溉条件下的根系生长动态。用固定样方法调查了地上部分的生长发育动态。于成熟期测定了地上、地下生物量，分析了不同施肥、土壤水分对小麦生长的影响。结果表明，高施肥量可促进地上部分生物量增加，但使地下部分生物量减少；无灌溉条件下春小麦地下地上生物量比值高于灌溉条件下的春小麦。

关键词: 春小麦, 根系, 生物量

Abstract: Root growth dynamics of four spring wheat varieties in different nitrogen levels and under no-irrigated conditions were observed by using minirhizotron technique.The growth dynamics of above-ground parts investigated by the method of fixed sample.Below- and above-ground biomass in ripening stage was also measured.After 54 days of seedling emergence the root amounts reached maximum level.Root biomass of plants fertilized with 37.5g/m² of pure nitrogen was less than that of the plants fertilized with 22.5g/m² of nitrogen.Otherwise, the state of the above-ground biomass was opposite.The specific value of the below- and above-ground biomass of the plants under no-irrigated condition was greater than that under irrigated condition.

Key words: Spring wheat, Root system, Growth dynamics, Biomass