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Frontiers of Environmental Science & Engineering in China : Volume 1, Issue 2, May 2007

Frontiers of Environmental Science & Engineering in China : Volume 1, Issue 1, February 2007

Impact of photosynthesis and transpiration on nitrogen removal in constructed wetlands

Content Provider	Springer Nature Link
Author	Luo, Weiguo Wang, Shihe Huang, Juan Yan, Lu Huang, Jun
Copyright Year	2007
Abstract	To determine the impact of photosynthesis and transpiration on nitrogen removal in wetlands, an artificial wetland planted with reeds was constructed to treat highly concentrated domestic wastewater. Under different meteorological and hydraulic conditions, the daily changes of photosynthesis and transpiration of reeds, as well as nitrogen removal efficiency were measured. It was found that net photosynthesis rate per unit leaf area was maintained on a high level (average 19.0 μmol CO$_{2}$/(m$^{2}$·s)) from 10:00 to 14:00 in July 2004 and reached a peak of 21.1 μmol CO$_{2}$/(m$^{2}$·s) when Photon Flux Density was high during the day. Meanwhile, TN and NH$_{4}$ $^{+}$-N removal efficiency rose to 79.6% and 89.6%, respectively—the maximum values observed in the test. Correlation coefficient analysis demonstrated a positive correlation among photon flux density, net photosynthetic rate, transpiration rate, and TN and NH$_{4}$ $^{+}$-N removal efficiency. In contrast, there was a negative correlation between stomatal conductance and TN and NH$_{4}$ $^{+}$-N removal efficiency. Results suggest that the photosynthesis and transpiration of wetland plants have a great impact on nitrogen removal efficiency of wetlands, which can be enhanced by an increase in the photosynthesis and transpiration rate. In addition, the efficiency of water usage by reeds and nitrogen removal efficiency could be affected by the water level in wetlands; a higher level boosts nitrogen removal efficiency.
Starting Page	316
Ending Page	319
Page Count	4
File Format	PDF
ISSN	16737415
Journal	Frontiers of Environmental Science & Engineering in China
Volume Number	1
Issue Number	3
e-ISSN	16737520
Language	English
Publisher	Higher Education Press
Publisher Date	2007-01-01
Publisher Institution	Chinese Universities
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	wetland plant photosynthesis transpiration nitrogen removal Environment
Content Type	Text
Resource Type	Article
Subject	Environmental Science

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