中文摘要：

研究以芦苇杆、树枝及芦苇杆＋树枝这三组植物秸秆作为碳源,分别补充于人工湿地基质表层（0-5cm）和中层（30-35cm）对脱氮效果的影响.试验结果表明,在进水条件下,补充植物秸秆能将人工湿地系统的TN去除率从44%提高到53%-66%,秸秆材料种类对脱氮效果影响不显著;对于三组植物秸秆材料,补充在中层均能较表层更好地提高脱氮效果,而且具有更强的抵抗进水氮负荷冲击能力.沿程氮形态分析表明：补充植物秸秆后,可以解除由于有机碳源不足产生的硝氮、亚硝氮积累,提高总氮的去除效率;而秸秆补充于中层,由于未干扰进水氨氮的硝化过程,增加底物硝氮、亚硝氮的反硝化反应,从而较之补充于表层有更好的脱氮效果.

英文摘要：

Effect of the carbon sources of three plant straws-reed,branch and reed＋branch supplement in constructed wetland.The straws filling surface layer （0-5cm） and middle layer （30-35cm） on nitrogen removal was studied.Experimental result shows that,supplement constructed wetland with plant straw under the condition of experimental influent could enhance system TN removal rate from 44%to 53%-66%,and the type difference of plant straws has no significant effect on nitrogen removal.Supplement of these three plant straws in middle layer can reach better nitrogen removal efficiency and have stronger ability to resist the impact of influent nitrogen loading.Nitrogen form variation with distance indicates that,supplement of plant straw can clear nitrate nitrogen and nitrite nitrogen accumulation induced by lack of organic carbon,thus improves nitrogen removal efficiency.The plant straw supplement in middle layer,because of not interfering with the process of nitrification of influent ammonia nitrogen can produce more denitrification substrates-nitrate nitrogen and nitrite nitrogen,having better nitrogen removal efficiency than supplement in surface layer.