[Objective] The study aimed to provided theoretical basis on grasping the change regularity of stomatal resistance of rice. [Method] In the clear day, based on experimental data of diurnal variation of leaf stomatal resistance in different growth periods of hsien rice (Ningjing 1 NO. ) and japonica rice (Liangyoupeijiu) , the diurnal variation regularity of rice canopy stomatal resistance in different growth stage were analyzed, the difference of stomatal resistance between hsien rice (Ningjing 1 NO. ) and japonica rice ( Liangyoupeijiu), and the influence of soil water stress on stomatal resistance were discussed. [Result] The diurnal variation regularity of stomatal resistance of hsien rice (Ningjing 1 NO. )and japonica rice (Liangyoupeijiu) were same in the same growth stage, the change approached equilibrium from 9:00 to 15 :00, but it increased after 15 :00; the leaf stomatal resistance was small in the jointing stage, but it reached the peak in the milk stage. The stomatal resistance of hsien rice higher than japonica rice by comparing the difference of stomatal resistance between hsien rice and japonica rice, and difference was observed in late growth stage. [Conclusion] The soil water content had greatly effects on the stomatal resistance and different rice variety also had different stomatal resistance. The stomatal resistance of rice leaf increased from upper layer to lower layer gradually in the whole growth stages and stomatal resistance of upper layer has acute diurnal change.%[目的]为掌握水稻叶片气孔阻力的变化规律提供理论依据.[方法]在晴天时,根据不同生育期内籼稻(宁粳一号)和粳稻(两优培九)叶片气孔阻力的日变化试验数据,分析了水稻冠层气孔阻力在不同生育期的日变化规律,探讨了品种间气孔阻力的差异和土壤水分胁迫对冠层气孔阻力的影响.[结果]在同一生育期内,籼稻(宁粳一号)和粳稻(两优培九)气孔阻力的日变化规律基本相似,在9:00～15:00变化平衡,15:00以后急剧增大;拔节期以前,9:00～15:00较小,生育期后期9:00-15:00明显增大.通过比较不同品种水稻气孔阻力可知,粳稻(宁粳一号)的气孔阻力明显高于籼稻(两优培丸),在生育后期差异明显.土壤水分对气孔阻力有较大影响,土壤水分含量的增加可以有效提高气孔开度,降低气孔叶片阻力;水稻植株叶片气孔阻力从上层到下层全天呈增大趋势.[结论]水稻叶片气孔阻力的大小与多种因素有关,包括不同生育期、品种、土壤水分、叶片冠层.
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