Diurnal redox fluctuation and microbial activity in the rhizosphere of wetland plants

Nikolausz, Marcell; Kappelmeyer, Uwe; Székely, Anna J.; Rusznyák, Anna; Màrialigeti, Károly; Kästner, Matthias

doi:10.1016/j.ejsobi.2008.01.003

Cited by 81 publications

(36 citation statements)

References 57 publications

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“…Core incubations and in situ flux chambers frequently examine the effects of anoxia on P mobility from sediments but the effects of repetitive redox oscillations are rarely investigated in a controlled setting (Frohne et al, 2011;Matisoff et al, 2016;Nürnberg, 1988;Thompson et al, 2006). Consequently, the cumulative and reversible effects of oxic-anoxic cycling on P distribution, speciation and mobility within sediments are poorly understood.…”

Section: T Parsons Et Al: Sediment Phosphorus Speciation and Mobmentioning

confidence: 99%

“…For samples taken during anoxic half-cycles, centrifugation, filtering and subsampling were performed in an anoxic glove box (N 2 : H 2 97:3 %, O 2 < 1 ppmv). Time periods were chosen to be representative of short temporal fluctuations to redox conditions experienced by surficial sediments (Aller, 1994;Nikolausz et al, 2008;Parsons et al, 2013). Similarly, the temperature and dark conditions were chosen to reflect those measured in surficial sediment during summer months at the field site.…”

Section: T Parsons Et Al: Sediment Phosphorus Speciation and Mobmentioning

confidence: 99%

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Sediment phosphorus speciation and mobility under dynamic redox conditions

Parsons¹,

Rezanezhad²,

O’Connell³

et al. 2017

Biogeosciences

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Abstract. Anthropogenic nutrient enrichment has caused phosphorus (P) accumulation in many freshwater sediments, raising concerns that internal loading from legacy P may delay the recovery of aquatic ecosystems suffering from eutrophication. Benthic recycling of P strongly depends on the redox regime within surficial sediment. In many shallow environments, redox conditions tend to be highly dynamic as a result of, among others, bioturbation by macrofauna, root activity, sediment resuspension and seasonal variations in bottom-water oxygen (O 2 ) concentrations. To gain insight into the mobility and biogeochemistry of P under fluctuating redox conditions, a suspension of sediment from a hypereutrophic freshwater marsh was exposed to alternating 7-day periods of purging with air and nitrogen gas (N 2 ), for a total duration of 74 days, in a bioreactor system. We present comprehensive data time series of bulk aqueous-and solidphase chemistry, solid-phase phosphorus speciation and hydrolytic enzyme activities demonstrating the mass balanced redistribution of P in sediment during redox cycling. Aqueous phosphate concentrations remained low (∼ 2.5 µM) under oxic conditions due to sorption to iron(III) oxyhydroxides. During anoxic periods, once nitrate was depleted, the reductive dissolution of iron(III) oxyhydroxides released P. However, only 4.5 % of the released P accumulated in solution while the rest was redistributed between the MgCl 2 and NaHCO 3 extractable fractions of the solid phase. Thus, under the short redox fluctuations imposed in the experiments, P remobilization to the aqueous phase remained relatively limited. Orthophosphate predominated at all times during the experiment in both the solid and aqueous phase. Combined P monoesters and diesters accounted for between 9 and 16 % of sediment particulate P. Phosphatase activities up to 2.4 mmol h −1 kg −1 indicated the potential for rapid mineralization of organic P (P o ), in particular during periods of aeration when the activity of phosphomonoesterases was 37 % higher than under N 2 sparging. The results emphasize that the magnitude and timing of internal P loading during periods of anoxia are dependent on both P redistribution within sediments and bottom-water nitrate concentrations.

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Section: T Parsons Et Al: Sediment Phosphorus Speciation and Mobmentioning

confidence: 99%

Section: T Parsons Et Al: Sediment Phosphorus Speciation and Mobmentioning

confidence: 99%

Sediment phosphorus speciation and mobility under dynamic redox conditions

Parsons¹,

Rezanezhad²,

O’Connell³

et al. 2017

Biogeosciences

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“…The previous studies had found that the ability of roots to secrete oxygen could activate surrounding microbes, which improved the degradation and adsorption of organic matter, and increased the oxygen concentration of the wetland at the same time [27][28][29]. roots to secrete oxygen could activate surrounding microbes, which improved the degradation and adsorption of organic matter, and increased the oxygen concentration of the wetland at the same time [27][28][29]. Figure 4 shows the content of the accumulated organic matter (OM) of each layer in the three systems.…”

Section: Variation Of Dissolved Oxygen (Do) In Vertical Flow Construcmentioning

confidence: 99%

“…This suggested that choosing wetland plants was important and necessary. roots to secrete oxygen could activate surrounding microbes, which improved the degradation and adsorption of organic matter, and increased the oxygen concentration of the wetland at the same time [27][28][29]. Figure 4 shows the content of the accumulated organic matter (OM) of each layer in the three systems.…”

Section: Variation Of Dissolved Oxygen (Do) In Vertical Flow Construcmentioning

confidence: 99%

Evaluation of Organic Matter Removal Efficiency and Microbial Enzyme Activity in Vertical-Flow Constructed Wetland Systems

Chen

Huang

et al. 2016

Environments

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Abstract:In this study, enzyme activities and their relationships to organics purification were investigated in three different vertical flow constructed wetlands, namely system A (planting Pennisetum sinese Roxb), system B (planting Pennisetum purpureum Schum.), and system C (no plant). These three wetland systems were fed with simulation domestic sewage at an influent flow rate of 20 cm/day. The results showed that the final removal efficiency of Chemical Oxygen Demand (COD) in these three systems was 87%, 85% and 63%, respectively. Planting Pennisetum sinese Roxb and Pennisetum purpureum Schum. could improve the amount of adsorption and interception for organic matter in the substrate, and the amount of interception of organic matter in planting the Pennisetum sinese Roxb system was higher than that in planting the Pennisetum purpureum Schum. system. The activities of enzymes (urease, phosphatase and cellulase) in systems A and B were higher than those in system C, and these enzyme activities in the top layer (0-30 cm) were significantly higher than in the other layers. The correlations between the activities of urease, phosphatase, cellulase and the COD removal rates were R = 0.815, 0.961 and 0.973, respectively. It suggests that using Pennisetum sinese Roxb and Pennisetum purpureum Schum. as wetland plants could promote organics removal, and the activities of urease, phosphatase and cellulase in those three systems were important indicators for COD purification from wastewater. In addition, 0-30 cm was the main function layer. This study could provide a theoretical basis for COD removal in the wetland system and supply new plant materials for selection.

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“…Between 10 -15 µL of PCR products were loaded onto 8 % (w/v) polyacrylamide gels (40 % acrylamide stock solution, 2 % bis solution 37.5 :1). 30-60 % gradient of denaturant (7 M urea and 40 % formamide v/v as 100 % denaturant (Nikolausz et al, 2008) was used to prepare the gel and the gel was run for 16 h in 1X Tris-Acetic acid-EDTA (TAE) buffer at 60 volts. The gel was finally stained with SYBR green.…”

Section: Dggementioning

confidence: 99%

Isolation of hydrocarbonoclastic bacteria from bilge oil contaminated water

Sivaraman

Ganguly

Nikolausz

et al. 2011

Int. J. Environ. Sci. Technol.

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Two bacterial strains, i.e. Pseudomonas mendocina and Ochrobactrum sp. were isolated from bilge oil contaminated water of Mormugao harbour, Goa, India and grown in a culture medium with hexadecane as the sole carbon source. Pseudomonas mendocina was used in further studies as it was the dominant strain. This strain effectively degraded tetradecane, hexadecane and octadecane leaving a residual concentration of about 73 %, 54 % and 40 % respectively in 120 h. Sequence analysis of the dominant bands from the denaturing gradient gel electrophoresis profiles revealed the differences between the genera of bilge oil contaminated sea water and its enrichment culture on hexadecane indicating a shift in community structure based on the type of substrate available. Pseudomonas mendocina amplified for the following catabolic genes namely C23O, nid and ndo. Based on the catabolic gene study the potential of the bacterial strain isolated, i.e. Pseudomonas mendocina seems to be interesting as it will be able to degrade polyaromatic hydrocarbons as well. Physicochemical properties of Pseudomonas mendocina indicates production of exopolysaccharides based on the value of its isoelectric point.

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Diurnal redox fluctuation and microbial activity in the rhizosphere of wetland plants

Cited by 81 publications

References 57 publications

Sediment phosphorus speciation and mobility under dynamic redox conditions

Sediment phosphorus speciation and mobility under dynamic redox conditions

Evaluation of Organic Matter Removal Efficiency and Microbial Enzyme Activity in Vertical-Flow Constructed Wetland Systems

Isolation of hydrocarbonoclastic bacteria from bilge oil contaminated water

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