冬小麦分蘖期复水对根、冠生长及其相互关系的影响

以冬小麦品种北农6号为材料,通过温室管栽试验,研究了苗期中度和童度缺水条件下分蘖期复水对冬小麦株高、叶面积、根、冠干物质积累、叶面积比、根冠比、产量、耗水量和水分利用效率等指标的影响.结果表明,苗期受旱程度不同的冬小麦分蘖期恢复供水后,其株高、单株叶面积、生物量及产量等都超过中度和重度缺水对照,表现出明显的激发生长效应.同时,各复水处理与对照相比,分配到冠部的干物质比饲均增加,R/S下降.在不同土壤水分条件下,冬小麦的水分利用效率随耗水量的增加而降低,中度水分亏块后分蘖期充分供水的处理,可以在少减产的情况下节约大量用水,从而达到提高水分利用效率的目的.

Effects of rewatering during tillering stage after previous water stress on winter wheat root and shoot growth and their relations

The effect of rewatering during the tillering stage on the plant height,leaf area,root and shoot dry matter accumulation,leaf area rate,R/S,biomass and grain yields,water consumption,water use efficiency(WUE) of winter wheat threated by moderate or serious drought at seeding period,were studied using wheat cultivars Beinong 6 as materials with tube planting experiment.The results indicated that the plant height,leaf areas,biomass and grain yields of wheat rewatered during the tillering stage after previous water stress can exceed the moderate and serious water deficit controls,and showed a obvious excitation growth effects.Meanwhile,the proportion of dry matter distributed to the shoot increased and the R/S decreased in rewatered treatments compared with the controls.Under different water conditions,the WUE of winter wheat were decreased with the increase of water consumption.The treatment underwent moderate water stress during the seeding stage could save a great deal of water in the case of a little reduction in grain yield.Thus,rewatering during the tillering stage had a remarkable effect on promoting growth and reducing water consuming in winter wheat.