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采用土柱栽培法研究了不同盐分和氮肥水平对菠菜水分与氮素利用效率的影响。结果表明,300 kg ha-1氮水平下,菠菜增产16.6%,水分利用效率(Water Use Efficiency,WUE)提高9.6%;其中以0.87 dS m-1处理的WUE最大,为25.8 kg m-3,盐分和氮肥的交互影响使WUE提高1.55 kg m-3。同时3,00 kg ha-1氮水平比100 kg ha-1氮水平的氮素利用效率(Nitrogen UseEfficiency,NUE)平均降低40%。盐分增加,NUE降低。高盐高氮处理的氮肥回收率(Nitrogen Fertilizer Recovery Efficiency,NRE)和农业氮利用效率(Agronomic Nitrogen Use Efficiency,NAE)最低,土壤残留氮量最高,对环境造成的潜在危害最大。
Soil column cultivation was used to study the effects of different salt and nitrogen levels on water use efficiency and nitrogen use efficiency of spinach. The results showed that spinach increased yield by 16.6% and water use efficiency (WUE) by 9.6% at 300 kg ha-1 nitrogen level, of which, the maximum WUE at 0.87 dS m-1 was 25.8 kg m-3, The interaction of salt and nitrogen fertilizer increased WUE by 1.55 kg m-3. Nitrogen Use Efficiency (NUE) of 3,00 kg ha-1 nitrogen level was reduced by 40% on average compared with 100 kg ha-1 nitrogen level. Salt increased, NUE decreased. Nitrogen Fertilizer Recovery Efficiency (NRE) and Agronomic Nitrogen Use Efficiency (NAE) were the highest in high-salt and high-nitrogen treatments, with the highest residual nitrogen content and the highest potential harm to the environment.