Journal
ECOLOGICAL ENGINEERING
Volume 36, Issue 10, Pages 1341-1347Publisher
ELSEVIER
DOI: 10.1016/j.ecoleng.2010.06.010
Keywords
Constructed wetland; Chemical oxygen demand; Stress; Phragmites australis; Tolerance
Funding
- National Key Technology RAMP
- D Program for the Eleventh Five-year Plan [2006BAC10B03]
- Major National Science and Technology Project [2009ZX07210-009]
- Special Science Innovation Foundation of Shandong University [2009JQ009]
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Constructed wetlands have been widely used to treat various wastewaters with large differences in their concentration of pollutants. The capability of wetland plants to resist these wastewaters is crucial for a wetland's healthy development Phragmites australis has been shown to have the capability to grow in simulated wastewater containing a wide concentration of pollutants. In this study, the physiological responses of P australis to simulated wastewaters with high chemical oxygen demands (CODs) were investigated in a bucket experiment. P australis was incubated in buckets for 30 days at live treatments of 0, 100, 200, 400, and 800 mg L-1 COD simulated wastewater. The net photosynthesis rate of the plants declined markedly with increasing COD levels. Proline and malondialdehyde (MDA) contents also increased dramatically. The plants further showed a unimodal pattern of superoxide dismutase (SOD) and peroxidase (POD) distribution along external COD values on the whole, indicating that high COD values (>= 200 mg L-1) can disrupt the normal metabolism of the plant. High COD levels (COD >= 400 mg L-1) caused evident physiological changes in P australis. (C) 2010 Elsevier B.V. All rights reserved
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