| 施氮量对柳枝稷生物质产量和水肥利用特性的影响 |
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| 引用本文： | 刘吉利,吴 娜.施氮量对柳枝稷生物质产量和水肥利用特性的影响[J].西北农业学报,2014,23(7):166-171. |
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| 作者姓名： | 刘吉利 吴 娜 |
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| 作者单位： | （1.宁夏大学 新技术应用研究开发中心,银川 750021; 2.宁夏大学 农学院,银川 750021） |
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| 基金项目： | 宁夏大学科学研究基金（NDZR10-64）；国家自然科学基金（31101103）。 |
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| 摘 要： | 在黄土高原半干旱地区,以能源作物柳枝稷为材料,通过田间试验,研究不同施氮量(0、60、120和240kg/hm2)对柳枝稷生物质生产和水氮利用效率的影响。结果表明:施氮显著提高柳枝稷生物质产量,当施氮量为120kg/hm2时柳枝稷生物质产量最高;施氮显著增加柳枝稷耗水量,在一定程度上降低土壤含水量,但显著提高水分利用效率;施氮显著提高柳枝稷生物质中氮质量分数和吸氮量,但施氮量超过120kg/hm2后,继续增加施氮量则不能显著增加植株对氮素的吸收积累;柳枝稷氮肥利用效率随氮肥用量增加而降低。可见,施氮量60~120kg/hm2既能保证柳枝稷较高的生物质产量,又能保证较高的水分利用效率和氮肥利用效率。
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| 关 键 词： | 柳枝稷 产量 氮肥 水分利用效率 氮素利用效率 |
Effect of Nitrogen Rate on Biomass Yield, Water and Fertilizer Utilization Characteristics of Switchgrass |
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| LIU Jili and WU Na.Effect of Nitrogen Rate on Biomass Yield, Water and Fertilizer Utilization Characteristics of Switchgrass[J].Acta Agriculturae Boreali-occidentalis Sinica,2014,23(7):166-171. |
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| Authors: | LIU Jili and WU Na |
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| Abstract: | The field trials were conducted to investigate the influence of nitrogen application rate on biomass production and water and nitrogen use efficiency of energy crop switchgrass in semi-arid areas of the Loess Plateau. The treatments included four nitrogen fertilizer rates, respectively: N0 (0 kg/hm), N60 (60 kg/hm), N120 (120 kg/hm) and N240 (240 kg/hm). The results showed that nitrogen application significantly improved the biomass yield of switchgrass, and the highest biomass yield were observed in N application treatment of 120 kg/hm. Nitrogen application significantly increased switchgrass evapotranspiration, and reduced soil moisture to some extent, but significantly improved water use efficiency. Within the range of 0-120 kg/hm N fertilizer level, nitrogen concentration and N uptake of switchgrass plant significantly increased, but no significant increase in nitrogen absorption and accumulation were found with more N application. Nitrogen use efficiency of switchgrass reduced with the increase of nitrogen application rate. Under the experimental condition, the nitrogen application rate between 60 kg/hm and 120 kg/hm could maintain higher biomass yield, higher water use efficiency and higher nitrogen use efficiency. |
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| Keywords: | Switchgrass Biomass yield Nitrogen fertilizer Water use efficiency Nitrogen use efficiency |
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