中南大学学报（自然科学版）2011，Vol.42Issue(2)：539-545,7.
河渠岸坡特定生态系统的脱氮效率及影响因素
Influencing factors of nitrogen removal from stream water using special riverine ecosystem
摘要
Abstract
An experimental model of streams with special riverine ecosystem was constructed to evaluate nitrogen removal from stream and its influencing factors using ecological embankments of porous concrete, microorganism and hydrophytes.The results show that the stream with the benefit of mature special riverine ecosystem gives the highest capacity of nitrogen removal, and the process of nitrogen removal fits first-order reaction kinetics, the reaction speed constant increases with the increase of temperature, and it is 0.331-0.353 d-l during vegetative season but 0.064 d-1 in winter.The ammonia-nitrogen removal is 85％-90％ within 7 d retention time, and the removal efficiency of total removal is affected by seasonal factors, which can reach 90％ during vegetative season, denitrifieation and plant uptake are both dominate in the process of nitrogen removal, which can contribute 85％ of total nitrogen removal.When it is in winter, the removal rate of total nitrogen from the stream reduces to 36.4％, and only denitrification plays the key role in the process of nitrogen removal which contributes 80.9％ of total nitrogen removal.The spatial-temporal characteristics of denitrifying bacteria have the same distribution as denitrification potential of substrate on ecological embankments,which all have an accumulated ecological effect on the hydrophyte rhizosphere microbes' activities.In contrast, in the stream with hard embankments, the removal rate of total nitrogen is bellow 72％ all the year around, and the maximum kinetic constant is only 0.191 d-1.It is evident that special riverine ecosystem via ecological embankments of porous concrete and hydrophytes can restore and complete the ecology system significantly.关键词
岸坡特定生态系统/多孔混凝土/脱氮/影响因素分类
资源环境引用本文复制引用
吴义锋,吕锡武,仲兆平,史静,徐微..河渠岸坡特定生态系统的脱氮效率及影响因素[J].中南大学学报（自然科学版）,2011,42(2):539-545,7.基金项目
国家自然科学基金资助项目(51009027) （51009027）
浙江省水利厅科技计划项目(RB0914) （RB0914）
