Effects of variable hydroperiods and water level fluctuations on denitrification capacity, nitrate removal, and benthic-microbial community structure in constructed wetlands

Ishida, Cari; Kelly, John J.; Gray, Kimberly A.

doi:10.1016/j.ecoleng.2006.06.010

Cited by 54 publications

(19 citation statements)

References 25 publications

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“…Interestingly, Serralves Lake also exhibited the lowest NO 3 removal efficiency, possibly because of lower NO 3 uptake by the dominant phytoplankton species. Although other researchers suggest that lower water retention time could also contribute to a better NO 3 removal (Ishida et al 2006), the opposite occurred in this study. Aslan and Kapdan (2006) suggested that a major reason for low nutrient removal efficiency, even under conditions of high nutrient concentrations, could be light limitation of phytoplankton growth because of excessive chlorophyll-a, which seems to be the situation for these study lakes.…”

Section: Discussioncontrasting

confidence: 93%

Eutrophication, phytoplankton dynamics and nutrient removal in two man‐made urban lakes (Palácio de Cristal and Serralves), Porto, Portugal

Xavier

Vale²,

Vasconcelos

2007

Lakes & Reservoirs

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Urban lakes are prone to eutrophication because of a number of factors, including a high water residence time (slow flushing rate), and high nutrient loads from artificial feeding of waterfowl and fish by visitors and from waterfowl faeces, falling leaves and nutrient run-off from adjacent areas. This study focuses on the ecology of two similar-sized urban lakes in Porto, Portugal, that exhibit some differing characteristics conducive to different trophic states and nutrient removal efficiencies. Although similar in many aspects, the two reservoirs developed quite diverse phytoplankton communities. The higher nitrogen load to Palácio de Cristal Lake could be the result of the higher concentration in its underground influent stream, while a less-oxidized nitrogen form (ammonia) is higher in Serralves Lake. Nitrate concentrations are higher in Palácio de Cristal Lake than in Serralves as a result mainly of high nitrate loads (maximum values above 80 mg L -1 ) in its influent stream. Interestingly, however, its nitrate removal efficiency is greater than for Serralves Lake. Cyanobacteria are the dominal phytoplankton In both lakes throughout the year. However, only one genus of this group (Pseudoanabaena mucicola) was the dominant phytoplankton in Palácio de Cristal Lake, while five Cyanobacteria species co-dominated in Serralves lake. Regular monitoring of Cyanobacteria and their toxins in urban recreation lakes is advised.

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Section: Discussioncontrasting

confidence: 93%

Eutrophication, phytoplankton dynamics and nutrient removal in two man‐made urban lakes (Palácio de Cristal and Serralves), Porto, Portugal

Xavier

Vale²,

Vasconcelos

2007

Lakes & Reservoirs

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“…Gao et al (2009) also demonstrated that the net N mineralization is positively correlated with the water contents (WCs) in both mash and peat soils. Additionally, Ishidaa et al (2006) observed that the variable hydroperiods and water level fluctuations affect nitrate (NO 3 À ) removal. Many studies have focused on the N dynamics in agricultural catchments (Kulasova et al, 2012), freshwater wetlands (Edwards and Withers, 2008), lakeshore wetlands (Luna-Guido et al, 2000), shallow-flooded peat lands (Kieckbusch and Schrautzer, 2007) and coastal salt wetlands (McKinney et al, 2001;Çakir et al, 2010), but little information is available on the changes in the nitrogen contents along the soil profile in an inland salt marsh under various flooding conditions.…”

Section: Introductionmentioning

confidence: 99%

The soil nitrogen dynamics in an inland salt marsh as affected by various experimental water levels

Huang

Bai

Xiao

et al. 2013

Hydrological Processes

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An 87‐day incubation experiment was conducted to investigate the effects of various water levels on the soil nitrogen content in an inland salt marsh of Xianghai, China. Soil samples were collected from depths in the range of 0 to 30 cm at 10‐cm intervals after 15, 54 and 87 days of incubation. The total nitrogen (TN), available nitrogen, nitrate nitrogen (NO3−‐N) and ammonium nitrogen (NH4+‐N) contents and the nitrogen activation coefficient (NAC) were measured to investigate the soil nitrogen dynamics under three inundation treatments (−5, 0 and 5 cm). The results showed that TN was generally accumulated in all soil layers and exhibited a peak value in subsurface soils at the −5‐cm inundation level at the end of the incubation period, whereas no obvious changes were observed in the TN contents in the bottom soils at the three inundation levels. Compared with the initial contents in the soils, the NO3−‐N and NH4+‐N contents were significantly reduced in all soil layers at the 0‐cm and the 5‐cm inundation levels at the end of the incubation period. In general, the available nitrogen content was higher in the surface soils compared with the deeper soils at all inundation levels. The NAC values exhibited a pronounced change in the subsurface soils at all inundation levels, decreasing significantly from 0.17 to 0.04 at the 5‐cm inundation level; however, a higher mean NAC value (0.126) was found over the incubation period at the 0‐cm inundation level compared with the 5‐cm and the −5‐cm inundation levels. Nitrogen was released from plants into the soil under all inundation treatments over the incubation period. The soil organic matter exerted positive loadings on the TN and NO3−‐N contents and negative loadings on the NH4+‐N content at all inundation levels, and the water content generally exhibited a negative relationship with all forms of nitrogen. Additionally, the total phosphorus content exhibited a positive correlation with the TN and NO3−‐N contents. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Besides this, the water volume of a lake has direct relations with its water surface area and water depth. The water surface area determines the zone where sediment denitrification occurs and the water depth affects the zone available for reed growing in the lake (Ishida et al, 2006;Lawniczak et al, 2010). The influence mechanism of water release on the water quality restoration is complicated, so the influence of parameter variation on reed management regime has no obvious rule.…”

Section: Effect Of Parameter Simplificationmentioning

confidence: 99%

An optimisation approach for shallow lake restoration through macrophyte management

Yin

Zhang

2014

Hydrol. Earth Syst. Sci.

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Abstract. Lake eutrophication is a serious global environmental issue. Phytoremediation is a promising, costeffective, and environmentally friendly technology for water quality restoration. However, besides nutrient removal, macrophytes also deeply affect the hydrologic cycle of a lake system through evapotranspiration. Changes in hydrologic cycle caused by macrophytes have a great influence on lake water quality restoration. As a result of the two opposite effects of macrophytes on water quality restoration (i.e. an increase in macrophytes can increase nutrient removal and improve water quality while also increasing evapotranspiration, reducing water volume and consequently decreasing water quality), rational macrophyte control through planting and harvest is very important. In this study, a new approach is proposed to optimise the initial planting area and monthly harvest scheme of macrophytes for water quality restoration. The month-by-month effects of macrophyte management on lake water quality are considered. Baiyangdian Lake serves as a case study, using the common reed. It was found that water quality was closest to Grade III on the Chinese water quality scale when the reed planting area was 123 km 2 (40 % of the lake surface area) and most reeds would be harvested at the end of June. The optimisation approach proposed in this study will be a useful reference for lake restoration.

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Effects of variable hydroperiods and water level fluctuations on denitrification capacity, nitrate removal, and benthic-microbial community structure in constructed wetlands

Cited by 54 publications

References 25 publications

Eutrophication, phytoplankton dynamics and nutrient removal in two man‐made urban lakes (Palácio de Cristal and Serralves), Porto, Portugal

Eutrophication, phytoplankton dynamics and nutrient removal in two man‐made urban lakes (Palácio de Cristal and Serralves), Porto, Portugal

The soil nitrogen dynamics in an inland salt marsh as affected by various experimental water levels

An optimisation approach for shallow lake restoration through macrophyte management

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