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潜流型人工湿地硝化和反硝化作用强度研究
引用本文:黄娟,王世和,鄢璐,刘洋,王峰.潜流型人工湿地硝化和反硝化作用强度研究[J].环境科学,2007,28(9):1965-1969.
作者姓名:黄娟  王世和  鄢璐  刘洋  王峰
作者单位:东南大学市政工程系,南京,210096
基金项目:国家自然科学基金项目(50278016)
摘    要:对芦苇、美人蕉、空白潜流型人工湿地中硝化、反硝化作用强度进行了对比研究. 结果表明, 潜流型湿地硝化作用强度受温度影响显著, 且与总氮、氨氮去除率显著相关. 各湿地硝化、反硝化作用强度的空间分布具有明显分层现象, 湿地表层高于深层. 芦苇湿地表层硝化作用强度呈中间高、两端低的变化趋势; 深层则沿程递减; 反硝化作用强度沿程变化不明显. 垂直流湿地平均硝化作用强度高于水平流湿地; 有植物湿地高于空白湿地; 芦苇湿地高于美人蕉湿地. 植物根系分泌物直接影响硝化作用强度, 根际硝化作用强度由根面至非根区递减. 潜流湿地具有较强的反硝化潜力, 反硝化作用强度明显高于硝化作用强度.

关 键 词:潜流  人工湿地  硝化/反硝化作用强度
文章编号:0250-3301(2007)09-1965-05
收稿时间:2006/9/26 0:00:00
修稿时间:2006-09-262006-12-05

Intensity of Nitrification and Denitrification in Subsurface-flow Constructed Wetlands
HUANG Juan,WANG Shi-he,YAN Lu,LIU Yang and WANG Feng.Intensity of Nitrification and Denitrification in Subsurface-flow Constructed Wetlands[J].Chinese Journal of Environmental Science,2007,28(9):1965-1969.
Authors:HUANG Juan  WANG Shi-he  YAN Lu  LIU Yang and WANG Feng
Institution:Department of Municipal Engineering, Southeast University, Nanjing 210096, China
Abstract:To reveal the nitrogen purification mechanism in subsurface-flow constructed wetlands, nitrification and denitrification intensities were studied in reed, canna and unplanted wetlands respectively. The results show that nitrification intensity in subsurface-flow wetlands is remarkably influenced by temperature and closely correlative with total and ammonia nitrogen removal efficiency. It appears in upright direction that nitrification and denitrification intensities in upper layer are higher than that in the lower. For the reed wetland, nitrification intensity is low in both ends but high in the middle of upper layer, while it decreases gradually along distance in lower layer. The change of denitrification intensity along distance is not obvious. Average nitrification intensity is higher in vertical-flow wetland than that in horizontal-flow wetlands, higher in planted wetlands than that in unplanted wetland and higher in reed wetland than that in canna wetland. The secretion from plant roots directly results in the gradual decrease of nitrification intensity in plant rhizosphere. Results also show that intensity of denitrification is obviously higher than that of nitrification. Thereby, subsurface-flow wetland has strong denitrification potential.
Keywords:subsurface-flow  constructed wetland  nitrification/denitrification intensity
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