【摘要】 为探讨不同形态氮素营养对干旱条件下水稻P吸收与分配的影响,采用室内营养液培养及聚乙二醇(PEG6000)模拟水分胁迫处理的方法,在分蘖期设置3种供氮形态(NH4+-N、NO3--N以及NO3--N和NH4+-N相同浓度下等体积混合)和两种水分条件(非水分胁迫及水分胁迫)的耦合处理进行研究。结果表明1)在水分胁迫条件下,水稻植株及各部位含P量均是全NH4+-N营养明显高于全NO3--N营养;同时,在分蘖期,全NO3--N营养水稻植株含P量明显低于非水分胁迫条件下的相应处理,但水分胁迫对全NH4+-N以及NO3--N和NH4+-N混合营养水稻含P量影响不大;2)在两种水分条件下,全NH4+-N以及NO3--N和NH4+-N混合营养均相对降低了水稻对吸收进入体内的P向叶片和根系的运输比例;而全NO3--N营养则只相对降低了水稻体内的P向叶片的运输比例。此外,由分蘖初期到中期,在水分胁迫条件下,全NH4+-N营养水稻积累的P素增加比例最高。更多还原

【Abstract】 By using the method of nutrient solution culture and simulated water stress with PEG6000, the effects of different nitrogen forms （NO₃--N, NH₄+-N and the mixture of NO₃--N and NH₄+-N） and water statuses （non-water stress and water stress conditions） on P distribution in the different parts of rice plants at the seedling-tillering stage were studied. Under water stress, P content in the different parts of NH₄+-N supplied rice plants was higher than that of the other two nitrogen forms supplied ones, meanwhile, P content in NO₃--N supplied rice plants under non-water stress was higher than that under water stress, whereas water stress had no significant effect on P content in the rice plants supplied with NH₄+-N and the mixture of NO₃--N and NH₄+-N. Regardless of water conditions, from the early tillering stage to the middle tillering stage, the ratio of P distributed to leaves and roots supplied with NH₄+-N singly and the mixture of NO₃--N and NH₄+-N was reduced, while NO₃--N nutrition only reduced the rate of P distributed to leaves at this stage. Furthermore, the increased rate of P accumulated in rice plants was higher under NH₄+-N supplied plus water stress than other treatments in this period.更多还原