文献类型：期刊文献

英文题名：Cyanobacterial Nitrogen Fixation Influences the Nitrogen Removal Efficiency in a Constructed Wetland

作者：Zhang, Xiaodong[1] Jia, Xin[2] Yan, Liang[1] Wang, Jinzhi[1] Kang, Xiaoming[1] Cui, Lijuan[1]

第一作者：张骁栋

通信作者：Cui, LJ[1]

机构：[1]Chinese Acad Forestry, Beijing Key Lab Wetland Serv & Restorat, Inst Wetland Res, Beijing 100091, Peoples R China;[2]Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China

年份：2017

卷号：9

期号：11

外文期刊名：WATER

收录：;EI(收录号：20174604402235);Scopus(收录号：2-s2.0-85033584468);WOS:【SCI-EXPANDED(收录号:WOS:000416798300051)】；

基金：This work was supported Fundamental Research Funds for the Central Non-Profit Research Institution of CAF (CAFYBB2014QB025), the National Natural Science Foundation of China (31770511, 31300400).

语种：英文

外文关键词：constructed wetland; nitrogen fixation; particulate organic nitrogen; Anabaena sp.

摘要：Nitrogen removal efficiency in constructed wetlands (CW) is influenced by multiple environmental factors. However, little is known about the role of cyanobacterial nitrogen fixation in affecting nitrogen removal efficiency. This study investigated how cyanobacterial nitrogen fixation affects the efficiency, at which a CW removes nitrogen from an associated artificial lake (AL) in Beijing. For this purpose, we measured cell densities of N-fixing and non-N-fixing cyanobacteria, the aquatic nitrogen fixation rate (R-Nfix), and the concentration of various nitrogen fractions over the growing season (April-November) of 2014 in both AL and CW. We found that the removal of particulate organic nitrogen (PON) contributed to >90% of the total nitrogen removal in the CW. The removal efficiency of PON was lower during August-October (55.45 +/- 27.49%) than during April-July (68.86 +/- 8.83%). Phytoplankton proliferation in summer, as one of the main sources of PON, may have exceeded the capacity of the CW and led to declines in PON removal efficiency. R-Nfix peaked in July-October (3-169 ng N.L-1.h(-1)) and was positively correlated with both PON concentration and the cell density of N-fixing Anabaena sp. over the growing season, suggesting that aquatic nitrogen fixation (primarily in the AL) may increase PON and thereby reduce the its removal efficiency in the CW.