【摘要】 为给镉污染稻区水稻合理灌溉提供理论与技术参考,通过盆栽试验研究了不同生育阶段间歇灌溉对双季稻产量构成与镉累积的影响。结果表明:(1)2季水稻总产以全生育期淹水灌溉处理最高,其次是全生育期间歇灌溉与齐穗至灌浆中期间歇灌溉处理,孕穗至齐穗期间歇灌溉处理产量显著降低;全生育期淹水灌溉处理有利于提高结实率,而全生育期间歇灌溉与分蘖至孕穗间歇灌溉处理有利于提高有效穗数。(2)灌水方式显著影响水稻各器官成熟期镉含量,其中全生育期间歇灌溉有显著提高效果,而全生育期淹水灌溉有降低效应。孕穗至齐穗、齐穗至灌浆中期间歇灌溉处理早、晚稻籽粒镉含量显著低于其他生育阶段间歇灌溉处理。(3)地上部镉累积量以全生育期淹水灌溉处理最低,全生育期间歇灌溉处理最高;各间歇灌溉处理中,孕穗至齐穗、齐穗至灌浆中期间歇灌溉处理地上部镉累积量相对较低。综上所述,为确保双季稻产量、降低稻米镉含量,镉污染稻区最佳灌溉方式为全生育期淹水灌溉,在水资源较紧张的情况下,齐穗至灌浆中期可采取间歇灌溉方式。更多还原

【Abstract】 To provide the theoretical and technical references for rational irrigation of rice in cadmium(Cd) polluted rice area, effects of intermittent irrigation at different growth stages on yield component and Cd accumulation of double-cropping rice were studied by pot experiment. The results showed that:(1) The total yield of double-cropping rice in the treatment of flooded irrigation in whole growth duration(FWD) was the highest, and that of treatment of intermittent irrigation in whole growth duration(IWD) and intermittent irrigation at full heading to mid-filling stage(IHM) followed, and that of treatment of intermittent irrigation at booting to full heading stage(IBH) decreased significantly. FWD was beneficial to increase the seed setting rate, while IWD and treatment of intermittent irrigation at tillering to booting stage(ITB) was beneficial to increase effective panicles number.(2) Irrigation modes significantly affected the Cd content in all rice organs at maturity stage, in which IWD had a significant improvement effect, while FWD had a decrease effect. Cd content in grains of early and late rice treated with IBH and IHM was significantly lower than that of treatment of intermittent irrigation at others stages.(3) As for the Cd accumulation of aboveground of rice in the whole growth duration, FWD was the lowest, and IWD was the highest. In all treatments of intermittent irrigation, Cd accumulation in aboveground of rice was relatively lower in treatments of IBH and IHM. In conclusion, in order to ensure the yield of double-cropping rice and reduce the Cd content in rice grains, FWD was the best irrigation mode in Cd polluted rice area, while IHM was the optimal irrigation mode under condition of water resource shortage.更多还原