交替隔沟灌溉下玉米根长密度分布及水分利用

Distribution of Root Length Density and Water Use Efficiency of Maize with Alternative Furrow Irrigation

为了探明交替隔沟灌溉和常规沟灌条件下玉米根长密度的分布规律及水分利用效率(WUE),研究了2种沟灌方式下玉米根长密度的空间分布和水分利用情况。结果表明,玉米根长密度在根区水平向和垂向呈指数分布。交替隔沟灌溉促进了玉米根系的水平向伸展和下扎深度,常规沟灌在垄位的大密度根系分布集中在20～60cm。交替隔沟灌溉增大了根系下扎深度,有利于根系吸收深层土壤水分,在非充分供水条件下提高了作物的水分利用效率,交替隔沟灌溉水分利用效率较常规沟灌提高5%以上。

In order to verify the distribution of root length density and water use efficiency （WUE） of maize with the alternative furrow irrigation （AFI） and conventional furrow irrigation （CFI）, the spatial distribution of root length density and crop water utilization of maize with AFI and CFI were investigated. Results indicated that maize root length density presented exponential distribution in both horizontal and vertical directions. AFI increased the horizontal growth and vertical depth of maize roots. Maize roots in ridge zone under CFI were mainly distributed in soil layer of 20-60 cm. Compared with CFI, WUE of maize with AFI increased by 5%. Therefore, AFI could promote maize root water uptake from deep soil layer, and increase WUE of crops with deficit irrigation.