高产冬小麦水分利用效率及其组分特征分析

依据8年田间和盆栽试验，分析了冬小麦基因型、密度和供水对水分利用效率(WUE)的影响。结果表明:当供水量变化范围较大时，总耗水(ET)和WUE呈显著线性负相关，ET对WUE的负效应明显大于产量(GY)对WUE的正效应。GY和ET有正相关趋势。当供水量变化范围较小时，GY和WUE呈显著线性正相关。蒸散效率(ETE)和收获指数(HI )都和WUE有正

A Study on Water Use Efficiency and Its Components in High-Yielding Winter Wheat

Based on 8 years' pot and field experiments, water use efficiency (WUE) of winter wheat was evaluated on genotypes, planting densities, and water supply. The results showed that when water supply amount varied in a larger range, negative linear correlation existed between total water use(ET)and WUE. The negative effect of ET on WUE was greater than the positive effect of grain yield (GY). No significant correlation was found between GY and WUE. On the other hand, when the change of water supply amount was less, the positive correlation between GY and WUE was significant. Evapotranspiration efficiency(ETE) and harvest index (HI) were positively correlated with WUE, but Contribution of ETE to WUE was greater than that of HI. No correlation between ETE and HI was revealed. Planting density had a small effect on WUE. Genotypic variation existed in WUE and its components. The genotypes with high WUE had high yielding ability. The high WUE and high yield could be realized via selecting genotype, optimum planting density and suitable amount and time of water supply.