A comparison of permanent and fluctuating flooding on microbial properties in an ex-situ estuarine riparian system

Mchergui, Chokri; Besaury, Ludovic; Langlois, Estelle; Aubert, Michaël; Akpa‐Vinceslas, Marthe; Buatois, Bruno; Quillet, Laurent; Bureau, Fabrice

doi:10.1016/j.apsoil.2014.01.012

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…In the present study, both PDNR and PNR increased with an elevated hydrologic gradient, corroborating the results of some previous studies [14,19,20,21,32,33], but were contrary to the results of some other previous studies [23,38]. We found no evidence of PNR in the subsurface sediments, which suggested that the nitrification process is not ubiquitous throughout the subsurface.…”

Section: Discussionsupporting

confidence: 85%

“…For two decades, sediment N cycling along hydrological gradients have raised global concerns, including the N pools and processes, and inorganic N fluxes across the sediment–water interface (Table 1); however, previous results have been unclear. For instance, sediment total N (TN), nitrate N (NO 3 − ), rates of nitrification, denitrification, and mineralization increased as inundation increased [1,14,17,18,19,20,21,22,23,24,25]. Nevertheless, no significant spatial variation in NH 4 + concentration and denitrification rates [23,26,27], and decreasing mineralization rates, TN, NH 4 + , and NO 3 − concentration [28,29,30,31] have also been found along an increasing hydrological gradient.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen along the Hydrological Gradient of Marsh Sediments in a Subtropical Estuary: Pools, Processes, and Fluxes

Zhang

et al. 2019

IJERPH

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Knowledge on the distribution of nitrogen (N) pools, processes, and fluxes along hydrological gradients provides a comprehensive perspective to understand the underlying causal mechanisms in intertidal flats, and thus improve predictions and climate adaptation strategies. We used a space-for-time substitution method to quantify N pools, processes, and fluxes along a hydrological gradient. Further, we linked N pools and processes and investigated not only surface but also subsurface sediments. Our results showed a gradual decrease in total N (TN) and mineralization rates (PNmin), but an increase in potential rates of nitrification (PNR) and denitrification (PDNR) under an elevated hydrological gradient, except for TN and PNmin in the subsurface sediment, which accumulated on the interaction zone between the high and middle tidal flats. Most sedimentary ammonium N (NH4+) and nitrate N (NO3−) concentrations were similar; however, NH4+ accumulated on the subsurface of the middle tidal flat. NO3− fluxes (from −0.54 to −0.35 mmol m−2 h−1) were uptake fluxes in the intertidal flats, but NH4+ fluxes (−2.48–3.54 mmol m−2 h−1) changed from uptake to efflux in the seaward direction. Structural equation modeling of the effects of inundation frequency, underground biomass, total carbon (TC), electrical conductivity (EC), and clay proportion on the N processes revealed that these accounted for 67%, 82%, and 17% of the variance of PDNR, PNmin, and PNR, respectively. Inundation frequency, underground biomass, TC, EC, and PNmin effects on N pools accounted for 53%, 69%, and 98% of the variance of NH4+, NO3−, and TN, respectively. This suggests that future sea level rise may decrease N storage due to increase in coupled nitrification–denitrification and decrease in N mineralization, and the NH4+ flux may change from sink to source in intertidal ecosystems.

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Nitrogen along the Hydrological Gradient of Marsh Sediments in a Subtropical Estuary: Pools, Processes, and Fluxes

Zhang

et al. 2019

IJERPH

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“…Fe-bearing clay minerals are one of the main components in soil. Variation of redox potential induced by Fe-bearing clay minerals under alternate flooding-drining condition is expected in different soils and can cause significant changes in soil functioning, plant response, soil bacterial community, N and P removal efficiency, organic matter decomposition, nutrient cycling, etc. − Therefore, comprehensive characterization methods of structural Fe redox state associated with redox potential are of particular importance in monitoring and predicting the biogeochemical processes in the natural environment. Moreover, Fe-bearing clay minerals also have a strong influence on the fate of contaminants in the environment.…”

Section: Discussionmentioning

confidence: 99%

Oxidation State and Structure of Fe in Nontronite: From Oxidizing to Reducing Conditions

Qian,

Scheinost,

Grangeon

et al. 2023

ACS Earth Space Chem.

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The redox reaction between natural Fe-containing clay minerals and its sorbates is a fundamental process controlling the cycles of many elements such as carbon, nutrients, redoxsensitive metals, and metalloids (e.g., Co, Mn, As, Se), and inorganic as well as organic pollutants in Earth's critical zone. While the structure of natural clay minerals under oxic conditions is wellknown, less is known about their behavior under anoxic and reducing conditions, thereby impeding a full understanding of the mechanisms of clay-driven reduction and oxidation (redox) reactions especially under reducing conditions. Here we investigate the structure of a ferruginous natural clay smectite, nontronite, under different redox conditions, and compare several methods for the determination of iron redox states. Iron in nontronite was gradually reduced chemically with the citrate-bicarbonate-dithionite (CBD) method. 57 Fe Mossbauer spectrometry, X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure (XANES) spectroscopy including its pre-edge, extended Xray absorption fine structure (EXAFS) spectroscopy, and mediated electrochemical oxidation and reduction (MEO/MER) provided consistent Fe(II)/Fe(III) ratios. By combining X-ray diffraction (XRD) and transmission electron microscopy (TEM), we show that the long-range structure of nontronite at the highest obtained reduction degree of 44% Fe(II) is not different from that of fully oxidized nontronite except for a slight basal plane dissolution on the external surfaces. The short-range order probed by EXAFS spectroscopy suggests, however, an increasing structural disorder and Fe clustering with increasing reduction of structural Fe.

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“…When O 2 is less available and soil redox potential is more reduced, slow organic matter decomposition may result in an accumulation of dissolved organic carbon [27]. Redox potential decreases more slowly under flooding-draining soils than under permanently flooded soils [28]. The aerobic/anaerobic biogeochemical equilibrium, nutrient inputs and outputs, and the structure of plant communities could, in all likelihood, be strongly disturbed during the waterlogged process and could further impact soil nutrient contents.…”

Section: Introductionmentioning

confidence: 99%

How Waterlogged Conditions Influence the Nitrogen Dynamics in a Soil–Water–Plant System: Implications for Wetland Restoration

Xie

Liu

Zhao

et al. 2021

Water

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Growing populations and industrialization have led to increased nitrogen (N) loads in wetland ecosystems. A micro-constructed wetland planted with Lythrum salicaria L. to treat artificial wastewater was used to investigate the short-term variations in the plant biomass and dynamics of total nitrogen (TN) content. Our results showed that the biomass of Lythrum salicaria L. rapidly increased during the experiment due to their extensive root system and vigorous spread, and waterlogged conditions had little effect on the relationship between biomass and the TN content in soil and effluent. Under different waterlogged conditions, the TN removal rates in the water were all greater than 60%, providing a reference for the waterlogged conditions used in wetland eutrophication restoration.

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A comparison of permanent and fluctuating flooding on microbial properties in an ex-situ estuarine riparian system

Cited by 9 publications

References 31 publications

Nitrogen along the Hydrological Gradient of Marsh Sediments in a Subtropical Estuary: Pools, Processes, and Fluxes

Nitrogen along the Hydrological Gradient of Marsh Sediments in a Subtropical Estuary: Pools, Processes, and Fluxes

Oxidation State and Structure of Fe in Nontronite: From Oxidizing to Reducing Conditions

How Waterlogged Conditions Influence the Nitrogen Dynamics in a Soil–Water–Plant System: Implications for Wetland Restoration

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