scholarly journals Decomposition of Standing Litter Biomass in Newly Constructed Wetlands Associated with Direct Effects of Sediment and Water Characteristics and the Composition and Activity of the Decomposer Community Using Phragmites australis as a Single Standard Substrate

Wetlands ◽  
2018 ◽  
Vol 39 (1) ◽  
pp. 113-125 ◽  
Author(s):  
Ciska C. Overbeek ◽  
Harm G. van der Geest ◽  
E. Emiel van Loon ◽  
Wim Admiraal
Keyword(s):  
Phragmites Australis ◽  
Constructed Wetlands ◽  
Direct Effects ◽  
Litter Biomass ◽  
Water Characteristics ◽  
Single Standard ◽  
Decomposer Community ◽  
Standing Litter

Reed stands in constructed wetlands: “edge effect” and photochemical efficiency of PS II in common reed

1997 ◽  
Vol 35 (5) ◽  
pp. 143-147 ◽  
Author(s):  
Olga Urbanc-Bercic ◽  
Alenka Gaberšcik
Keyword(s):  
Electron Transport ◽  
Solar Radiation ◽  
Phragmites Australis ◽  
Constructed Wetlands ◽  
Photochemical Efficiency ◽  
Common Reed ◽  
Ps Ii ◽  
Ets Activity ◽  
The Common ◽  
Reed Bed

In this study an attempt has been made to estimate the vitality of the common reed (Phragmites australis) grown in the constructed wetland. The efficiency of solar radiation uptake of leaves was measured and terminal electron transport system (ETS) activity of roots was determined in specimens from different locations on the reed bed. The results showed that photochemical efficiency of PS II, expressed as FvFm ratio, was higher in plants growing in the middle of the well established stand, but it was lower in plants growing in the area permanently flooded with leachate, where plants were significantly lower. Potential respiration of roots on the vertical rhizome decreases with depth, while it showed slight variations when determined at the same depth, but in plants from different locations within three beds of RBTS.

scholarly journals Effects of Elevated Atmospheric CO2 Concentration on Phragmites australis and Wastewater Treatment Efficiency in Constructed Wetlands

Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2500
Author(s):  
Zongshuai Wang ◽  
Shuxin Li ◽  
Shengqun Liu ◽  
Fahong Wang ◽  
Lingan Kong ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Phragmites Australis ◽  
Constructed Wetlands ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
Treatment Efficiency ◽  
Monooxygenase Activity ◽  
Physiological Performance ◽  
Elevated Atmospheric Co2 ◽  
Atmospheric Co2 Concentration

Elevated atmospheric CO2 concentration (e[CO2]) has been predicted to rise to more than 400 ppm by the end of this century. It has received extensive attention with regard to the pros and cons of e[CO2] effects in terrestrial and marine ecosystems, while the effects of e[CO2] on wastewater treatment efficiency in constructed wetlands (CWs) are rarely known. In this study, the atmospheric CO2 concentration was set as 400 ppm (that is, ambient [CO2]) and 800 ppm (that is, e[CO2]). The physiological performance of Phragmites australis and microbial enzyme activities in constructed wetlands in response to e[CO2] were tested. Significantly higher net photosynthetic rate and plant growth were found under e[CO2]. The concentrations of nitrate, total anions, and total ions in the xylem sap of Phragmites australis were reduced, while the uptake of N and P in plants were not affected under e[CO2] condition. In addition, the ammonia monooxygenase activity was reduced, while the phosphatase activity was enhanced by e[CO2]. The increased removal efficiency of chemical oxygen demand and total nitrogen in CWs could be ascribed to the changes in physiological performance of Phragmites australis and activities of microbial enzymes under e[CO2]. These results suggested that the future atmospheric CO2 concentration could affect the wastewater treatment efficiency in CWs, due to the direct effects on plants and microorganisms.

scholarly journals Modeling the Effect of Plants and Peat on Evapotranspiration in Constructed Wetlands

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Florent Chazarenc ◽  
Simon Naylor ◽  
Yves Comeau ◽  
Gérard Merlin ◽  
Jacques Brisson
Keyword(s):  
Phragmites Australis ◽  
Constructed Wetlands ◽  
Typha Latifolia ◽  
Growth Conditions ◽  
First Order ◽  
First Order Kinetics ◽  
Hydraulic Behaviour ◽  
Degradation Rates ◽  
Wide Range ◽  
Main Effect

Evapotranspiration (ET) in constructed wetlands (CWs) represents a major factor affecting hydrodynamics and treatment performances. The presence of high ET was shown to improve global treatment performances, however ET is affected by a wide range of parameters including plant development and CWs age. Our study aimed at modelling the effect of plants and peat on ET in CWs; since we hypothesized peat could behave like the presence of accumulated organic matter in old CWs. Treatment performances, hydraulic behaviour, and ET rates were measured in eight 1 m2CWs mesocosm (1 unplanted, 1 unplanted with peat, 2 planted withPhragmites australis, 2 planted withTypha latifoliaand 2 planted withPhragmites australiswith peat). Two models were built using first order kinetics to simulate COD and TKN removal with ET as an input. The effect of peat was positive on ET and was related to the better growth conditions it offered to macrophytes. Removal efficiency in pilot units with larger ET was higher for TKN. On average, results show for COD ak20value of 0.88d-1and 0.36d-1for TKN. We hypothesized that the main effect of ET was to concentrate effluent, thus enhancing degradation rates.

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