| 摘要: |
| 【目的】研究水与氮肥耦合对柳枝稷产量及品质的影响，探求水肥调控机理，为建立柳枝稷稳产管理体系提供科学依据。【方法】以施氮量和土壤含水量为考察因子，采用2因子5水平通用旋转正交组合设计，测定各处理下柳枝稷产量及纤维素、半纤维素、木质素和可溶性糖含量，构建柳枝稷产量与2个因子间的回归方程，并通过方差分析研究水与氮肥耦合对柳枝稷产量及品质的影响。【结果】水与氮肥耦合对柳枝稷产量和品质均产生了不同程度的影响。对产量而言，水与氮肥之间存在明显的协同效应，对产量有显著的影响（P<0.05）。土壤含水量由8%提高到32%时，产量达最大值所需氮肥量由1.174 g/盆增加到2.764 g/盆。在土壤含水量为20%或施氮量为 1.152 g/盆时，产量趋于稳定。对柳枝稷品质而言，纤维素含量与木质素含量均随着土壤含水量增大呈下降趋势；随着施氮量的增加，木质素含量不断降低，施氮量为2.232 g/盆时，柳枝稷木质素含量最低为36.957 mg/g，仅为0.072 g/盆施氮量的2/3。半纤维素含量在不同水与氮肥处理下差异不显著（P>0.05），纤维素、木质素和可溶性糖含量均受到施氮量和土壤含水量的显著影响（P<0.05），但是两者的交互作用只对木质素含量影响显著（P<0.05）。【结论】水与氮肥对柳枝稷产量存在明显的协同效应，其木质素含量随着氮肥和土壤含水量的增加呈下降趋势，故提高氮肥施用量和土壤含水量对柳枝稷作为能源作物生产较为有利。 |
| 关键词: 柳枝稷 水与氮肥耦合 产量 品质 |
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| 基金项目:国际科技合作项目“牧草植物生物能开发的实施挑战和报酬评估”(2009BADA7B04)；科技部“973”子项目“耐盐碱能源草筛选与新品种选育”（2009BADA7B04） |
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| Effects of water and nitrogen fertilizer coupling on biomass yield and quality of switchgrass |
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DU Jin-hong,HAYIXIA·Ye-er-sai-yi-ti,LIU Yuan,et al
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| Abstract: |
| 【Objective】The experiment studied effects of water and nitrogen fertilizer coupling on biomass yields and quality of switchgrass and explore the regulation mechanism of water and nitrogen fertilizer treatments,so as to establish proper management system for switchgrass production.【Method】The experiment were designed to incorporate nitrogen and soil water content at five levels using general rotary orthogonal combination design matrix.Yield and quality indexes including contents of cellulose,hemicellulose,and lignin and soluble sugar were measured.Then regression models between switchgrass yield and the two factors and variance analysis were conducted to test the effects of water and nitrogen fertilizer coupling on switchgrass.【Result】Effects of water and fertilizer interaction on switchgrass yield and quality were observed.The interaction of water and nitrogen fertilizer has significant synergistic effect on switchgrass yield（P<0.05).When soil water content increased from 8% to 32%,the amount of nitrogen applied leading to the maximum yield increased from 1.174 g/pot to 2.764 g/pot.When the soil water content increased to 20% and nitrogen application raised to 1.152 g/pot,the yield stabilized.The contents of cellulose and lignin decreased with the increase of soil moisture content.With the increase of nitrogen,the lignin content declined with the lowest content of 36.957 mg/g when nitrogen content was 2.232 g/pot,which was 2/3 of the lignin content when nitrogen content was 0.072 g/pot.Hemicellulose content was not significantly changed under different treatments (P>0.05) while contents of cellulose,lignin and soluble sugar were significantly affected by nitrogen and soil water content (P<0.05).However,the interaction of nitrogen and soil water only affected the lignin content significantly (P<0.05).【Conclusion】Water and nitrogen had significant synergistic effects on switchgrass yield.Increase of nitrogen and soil water content decreased the content of lignin.Thus,increasing nitrogen fertilizer and soil water content was beneficial to the production of switchgrass for energy purpose. |
| Key words: switchgrass water and nitrogen fertilizer coupling yield quality |
