控制性根系分区交替灌溉对冬小麦水分与养分利用的影响

以移栽小麦为试验材料，采用盆栽的方法研究了3种不同灌水方式：全面积均匀灌水(对照)、控制1/2区域交替灌水(CRDI)和控制固定1/2区域灌水对冬小麦水分与养分利用的影响。研究结果表明：在同一灌水方式中土壤含水率下限小的冬小麦根冠比大，且根系总的干重也大；CRDI对根系生长有显著促进作用，使根均匀分布在土壤中，且根长密度较对照大；对于CRDI，当控制土壤含水率下限由65％θ_F变化为55％θ_F时，耗水量下降了35％，节水效果明显；土壤含水率较高，有利于冬小麦根系对土壤中离子态养分的吸收；土壤含水率下限相同时，3种不同的灌水方式中，土壤中H₂PO^-₄和NH⁺₄-N离子浓度均呈现出递减的趋势，而NO^-₃-N离子浓度却呈现出明显的递增趋势，在同一土壤含水率下，CRDI对养分离子的吸收优于其它两种灌水方式。

Impacts of the controlled roots-divided alternative irrigation on water and nutrient use of winter wheat

Impacts of three-irrigation methods, i.e., all soil area irrigation (CK), the controlled roots-divided alternative irrigation (CRDI) and fixed half of root area irrigation on water and nutrient use of winter wheat were studied with the potted method. Results showed that there were a big root-canopy ratio and dry weight when the lower limit of controlled soil water content decreased at the same irrigation treatment. There were an obvious improving role for winter wheat root system growth with CRDI irrigation, representation of well-distributed root in soil and a large root density. When the lower limit of soil moisture changed from 65% field capacity to 55% field capacity, water consumption dropped by 35%, which showed an remarkable water-saving effect. Analysis of the nutrient uptake of winter wheat with different irrigation methods showes that the high soil water content benefits nutrient absorption by winter wheat. At the same lower limit of soil water content, there were decrease trends of soil H₂PO^-₄ and NH⁺₄-N concentration within growth period and soil profile under different irrigation methods, but NO^-₃-N concentration was in increase trend, The nutrient uptake of winter wheat with CRDI was more than those by other irrigation methods at the same soil water content.