NDLI: Influence of earthworm Eisenia fetida on Iris pseudacorus's photosynthetic characteristics, evapotranspiration losses and purifying capacity in constructed wetland systems.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Xu, Defu Li, Yingxue Fan, Xiaolong Guan, Yidong Fang, Hua Zhao, Xiaoli
Description	Country affiliation: China Author Affiliation: Xu D ( School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China. defuxu1@163.com)
Abstract	Four constructed wetland systems were studied to investigate the effects of adding Eisenia fetida on the purifying capacity of constructed wetlands. Addition of E. fetida increased the photosynthetic rate (Pn), transpiration rate (Tr) and chlorophyll meter value of leaves of Iris pseudacorus L. in the constructed wetlands by 16, 35 and 7%, respectively. Compared with the substrate only system, evapotranspiration losses were increased by 8, 48 and 56% for the wetland systems with substrate and E. fetida, with substrate and I. pseudacorus, and with substrate, I. pseudacorus and E. fetida, respectively. Addition of E. fetida to the substrate only and substrate and plant wetland systems decreased the substrate bulk density by 3 and 6%, respectively. The addition of E. fetida to the system with substrate and plants increased the removal efficiency of chemical oxygen demand (CODMn), total nitrogen (TN) and total phosphorus by 5, 7 and 22%, respectively. Evapotranspiration losses were significantly positively correlated with the removal efficiency of CODMn (P < 0.01). The significantly negative correlation between the removal efficiency TN and bulk density was found (P < 0.05). Therefore, E. fetida could stimulate I. pseudacorus growth and improve the substrate bulk density in the constructed wetland, resulting in enhanced purifying capacity.
File Format	HTM / HTML
ISSN	02731223
Issue Number	2
Volume Number	68
e-ISSN	19969732
Journal	Water Science & Technology
Language	English
Publisher	IWA Publishing
Publisher Date	2013-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Hydrology Iris Plant Physiology Oligochaeta Metabolism Waste Disposal, Fluid Methods Water Pollutants, Chemical Wetlands Animals Biological Oxygen Demand Analysis Nitrates Nitrogen Phosphorus Photosynthesis Plant Leaves Plant Transpiration Quaternary Ammonium Compounds Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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