草业学报2016，Vol.25Issue(3)：164-171,8.DOI:10.11686/cyxb2015232
交替灌溉对紫花苜蓿生物量分配与水分利用效率的影响
Effects of alternate furrow irrigation on the biomass allocation and water use efficien-cy of alfalfa
摘要
Abstract
Alternate furrow irrigation has been widely applied to crop production in order to optimize the harves-ting of seeds and fruits.A field experiment was conducted to determine the effects of alternate furrow irrigation on alfalfa above-ground yield and its components,root biomass,root to shoot ratio and water use efficiency. The experiment aimed to establish whether alternate furrow irrigation can apply to alfalfa whose harvest target is vegetative mass.The results showed that alternate furrow irrigation significantly improved the water use ef-ficiency of alfalfa.Moreover,there was no significant effect on above-ground biomass because branches per plant increased while leaf numbers per plant decreased.Alternate furrow irrigation increased root biomass at 0-20 cm and 0-60 cm soil levels,but decreased root biomass at 20-60 cm.Alternate furrow irrigation also increased root to shoot ratio,therefore improving alfalfa’s drought resistance under water stress.These results prove that alternate furrow irrigation not only improves water use efficiency but also maintains the yields of al-falfa.It does so by improving plant drought resistance by encouraging root system development and increasing the number of branches per plant.The results thus indicate that alternate furrow irrigation can be applied to the management of alfalfa production.关键词
交替灌溉/紫花苜蓿/水分利用效率/产量构成Key words
alternative furrow irrigation/alfalfa/water use efficiency/yield components引用本文复制引用
张静,王倩,肖玉,庞晓攀,贾婷婷,宋锐,刘慧霞..交替灌溉对紫花苜蓿生物量分配与水分利用效率的影响[J].草业学报,2016,25(3):164-171,8.基金项目
甘肃省科技重大专项项目（2013GS05907），兰州大学中央高校基本科研业务费（lzujbky-2014-m01），公益性行业（农业）科研专项经费（201403048-3）和西北民族大学创新团队计划项目经费资助。 （）
