中文摘要：

本文通过交替隔沟灌溉（AFI）、固定隔沟灌溉（FFI）、常规沟灌（CFI）的大田小区棉花实验,研究不同沟灌方式对棉花各器官氮素吸收和氮肥利用的影响。结果表明：AFI与CFI相比,棉花生物量、全氮含量、氮素吸收率（NAR）、氮肥吸收比例（Ndff）、氮肥利用率（NUE）随生育期变化,各器官全氮含量,NAR、Ndff差异均不显著 棉花各器官的NUE,苗期差异均不明显,蕾期以后茎的NUE平均降低9.6%,叶平均降低18.1%,根和蕾铃差异不显著 FFI与CFI相比,苗期棉花生物量、全氮含量、NAR和Ndff各器官差异均不显著,蕾期以后生物量平均降低22.5%~35.5%,全氮含量下降23.9%~43.8%,NAR下降35.0%~63.5%,Ndff下降15.0%~39.7%,NUE下降34.4%~46.7%。可见FFI方式显著降低棉花氮素吸收和利用效率,AFI则变化不明显,因此沟灌棉花宜采用AFI方式,有利于大田棉花的水氮管理。

英文摘要：

The effects of furrow irrigation patterns of i.e.alternative furrow irrigation（AFI）,conventional furrow irrigation（CFI） and fixed furrow irrigation（FFI）,on cotton nitrogen assimilation and nitrogen use efficiency were studied using field plot experiment.The result showed that cotton biomass,cotton nitrogen content（N）,cotton nitrogen absorption rate（NAR）,percentage of N derived from fertilizer（Ndff） and nitrogen use efficiency（NUE） in the seeding stage in cotton parts had no significant difference under AFI with that under CFI.However,after buding stage,NUE of stem and leaf under AFI was 9.6% and 18.1% lower than that under CFI,respectively,but NUE of root,buds and bolls had no significant difference.Compared to CFI,N,NAR,Ndff had no significant difference in seedling stage under FFI,However,after buding stage,cotton biomass,N,Ndff,NAR,and NUE was reduced by 22.5%-35.5%,23.9%43.8%,15.0%-39.7%,35.0%-63.5%,and 34.4%-46.7%,respectively.Our experiment showed that FFI significant reduced the NAR and NUE,but AFI had no influence on them.Therefore,AFI was recommended under the experiment conditions.