水氮耦合对盐碱地柳枝稷生物质产量、品质及水肥利用的影响

在宁夏银北盐碱地区,以'Cave-in-rock'柳枝稷为材料,采用随机区组试验设计,研究了水氮耦合对柳枝稷生物质产量、品质及水肥利用效率的影响,利用模糊相似优先比法分析了不同水氮处理下柳枝稷产量、品质及水肥利用效率的变化特征.结果表明,在盐碱地条件下,充足的灌水和适量的氮肥投入是柳枝稷高产和水肥高效利用的保证.在相同...

Effects of water-nitrogen coupling on biomass yield,quality and water and fertilizer utilization of switchgrass in saline-alkali soil

The effects of water-nitrogen coupling on biomass yield,quality and water and fertilizer use efficiency of switchgrass are studied by randomized block experiment using‘Cave-in-rock’switchgrass in the saline-alkali area of Yinbei,Ningxia.The changes characteristics of biomass yield,quality and water and fertilizer use efficiency of switchgrass under different water and nitrogen treatments are studied by using the method of Fuzzy similar priority ratio.The results show that under the conditions of saline-alkali soil,adequate irrigation and appropriate nitrogen fertilizer input are the guarantee for high yield and efficient utilization of water and fertilizer for switchgrass.Under the same irrigation conditions,medium nitrogen treatment significantly increases the yield,cellulose,hemicellulose content,water use efficiency,nitrogen agronomic efficiency and nitrogen use efficiency of switchgrass.Under the same nitrogen application rate,with the increase of irrigation,the yield of switchgrass increases,and the contents of cellulose,hemicellulose and ash decreases first and then increases.Medium nitrogen treatment can maintain low ash under different water conditions,and can obtain the highest yield,nitrogen agronomic efficiency,nitrogen use efficiency and water use efficiency under sufficient water conditions.Nitrogen treatment in high water(3000 m3·hm^-2,N 120 kg·hm^-2)is beneficial to high yield,high quality and the high efficiency of water and fertilizer utilization,and it is the optimum water and nitrogen management measure for the biomass production of switchgrass in Yinbei saline-alkali region of Ningxia.