用土柱栽培法研究了不同土层厚度条件下旱地小麦花后根系干重及产量变化 ,结果表明 :土层厚有利于旱地小麦根系生长 ,根系分布于表层的比例少 ;土层愈薄 ,籽粒产量中来自开花前贮藏器官物质运转的量所占的比例就愈高 ,产量愈低。由于处理 3(1 60 cm)与处理 4(对照 ,2 0 0 cm)差异不显著 ,处理 1 (80 cm)、2 (1 2 0 cm)与处理 4(对照 )差异显著 ,因此可以认为旱地小麦获得高产的土层厚度下限指标应在 1 60 cm左右 ,并可据此制定管理方案 ,以获得高产高效 The soil dry weight and yield of dryland wheat after anthesis were studied by soil column culture. The results showed that the thick soil layer was conducive to the growth of wheat root system in dryland and the root distribution was less in the surface layer. The thinner the soil layer, The higher the proportion of yield from the storage of pre-antiseptic storage organ material, the lower the yield. There was significant difference between treatment 1 (80 cm), 2 (120 cm) and treatment 4 (control) because treatment 3 (1 60 cm) and treatment 4 (control 2 0 0 cm) did not differ significantly, The lower limit of soil thickness for high-yielding wheat should be about 160 cm, and a management plan can be formulated to achieve high yield and high efficiency