中文摘要：

通过对表面流人工湿地不同土壤层硝化反硝化强度的研究，探讨了表面流人工湿地脱氮过程中沿程硝化和反硝化作用的变化，以及不同C：N对系统反硝化强度的影响。研究结果表明，系统可同时进行硝化和反硝化作用，硝化强度具有较明显的分层现象，表层土壤高于深层土壤。系统中沿程硝化强度呈递减趋势，硝化强度反映了氨氮去除率的大小，其去除率为68％。反硝化强度研究结果表明：深层土壤的反硝化强度略高于表层土壤；沿程1／3至1／2段最大；5倍碳源时反硝化强度最高，3倍碳源次之，不加碳源最低；但系统的反硝化强度普遍较高，保持了良好的脱氮效果。

英文摘要：

Activities of nitrification and denitrification of different soil layers in a surface flow wetland were determined to monitor the progress of nitrification and denitrification and to illustrate the effect of C ： N ratio on denitrification. Nitrification and denitrification took place simultaneously in the wetland. Nitrification was most active in the upper layer （0- 10 cm below the surface） with activity declining gradually with depth. Denitrification was more active in the deeper layer （20-40 cm below） with the highest activity found in the 1/3 to 1/2 section of the wetland. Addition of a carbon source enhanced denitrification; the activity order was C ： N = 5 2〉 C ： N = 3 2〉 control without carbon supplementation. Employed for disposal of aerated domestic wastewater （COD= 131- 183 mg/L, TN = 48.05 - 52.47 mg/L and NH4^＋ -N= 8.71- 13.05 mg/L）, the wetland system accomplished stable treatment performance with 67%, 71% and 68% reductions in COD, TN and NH4^＋-N, respectively.