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为探明调亏灌溉下冬小麦根系分布与耗水的关系，在大田条件下，以ND09 1、济麦22、烟农15、石家庄8号和潍62036为材料，研究了起身期、拔节期、开花期、花后20 d和成熟期0～200 cm不同土层冬小麦耗水动态与根系总重、总长以及根干重密度（DRWD）和根长密度（RLD）垂直分布的关系。结果表明，石家庄8号和济麦22开花期根系总干重、根系总长度、80～120 cm土层DRWD和RLD值都显著大于其他品种，花后20 d至成熟期间80～140 cm土层水分消耗量也明显大于其他品种，最终千粒重和产量也显著高于其他品种。提高灌浆后期深层根量有利于增强小麦植株利用深层水分的能力，保证灌浆后期的水分供应，实现节水高产。

英文摘要:

This research was undertaken to found the relationship between root distribution of winter wheat and water consumption under regulated deficit irrigation conditions. In the field, using ND09 1, Jimai 22, Yannong 15, Shijiazhuang 8 and Wei 62036 as materials, the vertical dynamic water consumption and total root weight, total root length, the root length density (RLD) and dry root weight density (DRWD) were investigated at double ridge stage, jointing stage, flowering stage, 20 days after flowering(20 DAF) and maturity stage in 0～200 cm soil layers. The results indicated that the value (total root dry weight, total root length, DRWD and RLD of 80～120 cm soil layers) of Shijiazhuang8 and Jimai 22 were higher than that of other varieties at flowering stage, and the amount of their water consumption in 80～140 cm soil layers was also the highest of all from 20 DAF to maturity stage, and their final 1000 kernel weight and yield were higher than that of others as well. Increment of the root amount in deep soil could increase root ability to absorb water from deep soil layers, and thus meet the need of water supply in the late period of grainfilling.

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