Effects of tide and season changes on the iron-sulfur-phosphorus biogeochemistry in sediment porewater of a mangrove coast

Pan, Feng; Liu, Huatai; Guo, Zhanrong; Li, Zhiwei; Wang, Bo; Cai, Yu; Gao, Aiguo

doi:10.1016/j.jhydrol.2018.11.002

Cited by 53 publications

(26 citation statements)

References 64 publications

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“…This pattern is analogous to the findings of previous studies (Rozan et al, 2002;Xu et al, 2012), which were explained by the gradual decline in the Fe reduction rate as Fe (III) (hydr)oxides (amorphous Fe) become depleted with depth (Figure 3). However, soluble Fe (II) concentrations in other profiles continued to increase until the bottom, which was also found in a previous study in the JE area (Pan, Liu, Guo, Li, et al, 2019). Due to rapid burial conditions in coastal/estuarine sediments, some labile Fe (III) (oxyhydr)oxides could be buried deeply before being reduced (e.g., JE-1, JE-2, and JR in Figure 3), providing a pool for enhanced Fe reduction at various depths (Mortimer et al, 2011).…”

Section: Distributions Of Dgt-labile S/p In Crab Burrowssupporting

confidence: 88%

“…Hydrodynamic Processes and Biogeochemistry of P and S in Crab Burrows 4.4.1. Biogeochemical Cycle of S in Crab Burrows A previous study on the estuary of the Jiulong River demonstrated that the tidal cycle plays an important role in sulfate reduction and S redox cycling via tide-induced redox changes that control DGT-labile S formation during flood tide and reoxidation during ebb tide (Pan, Liu, Guo, Li, et al, 2019). The crab burrow results at flood tide (few DGT-labile S throughout the profile) and ebb tide (elevated DGT-labile S in partial areas) seem to be completely opposite to the findings in previous research (Figure 8).…”

Section: Kinetic Process Of P Exchange Between Sediments and Porewatermentioning

confidence: 99%

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Kinetic Exchange of Remobilized Phosphorus Related to Phosphorus‐Iron‐Sulfur Biogeochemical Coupling in Coastal Sediment

Pan

Guo

Cai

et al. 2019

Water Resources Research

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Phosphorus (P) cycling in coastal sediment can be strongly coupled to iron (Fe) and sulfur (S) geochemical transformations. In this study, the high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) techniques were employed to synchronously characterize the in situ P-Fe-S biogeochemistry in coastal sediments around Xiamen Bay, China. The results show that P remobilization is mainly controlled by dissimilatory Fe reduction in the Jiulong River Estuary (JE) and the eastern coast of Xiamen Bay (EX), while it is dominated by sulfate reduction in the Jiuxi River Estuary. The confined oxidizing depth and the higher DGT-labile S and soluble Fe (II) concentrations in October indicate that the hypoxia induced by tides and river runoff has a greater effect on sulfate reduction and Fe reduction than high temperatures in July, which accelerate P remobilization and exchange flux. Model simulations of the P resupply and adsorption/desorption kinetics demonstrate that the enhancement of Fe reduction and sulfate reduction triggered by hypoxia promotes the continuous release of P. Both DGT-labile P and S presented distinct distribution patterns in crab burrows during flood tide and ebb tide. A negative P exchange flux to the overlying water controlled by Fe (III) retention at JE and a positive P exchange flux controlled by intense sulfate reduction at EX were observed, both of which were significantly higher than the molecular diffusion flux. We suggest that internal P loading related to Fe and S redox geochemistry should receive more attention, especially in the context of expanding global marine hypoxia.Special Section: Coastal hydrology and oceanography Key Points: • Redox conditions affected by hydrodynamic forces (tide and/or runoff) dominated iron/sulfate reduction and accompanied P remobilization • Enhanced sulfate reduction fueled by abundant organic matter and hypoxia in crab burrows significantly promoted P remobilization • The P flux via hydrological exchange in burrows was much higher than the conventional molecular diffusion fluxSupporting Information:• Supporting Information S1

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Section: Distributions Of Dgt-labile S/p In Crab Burrowssupporting

confidence: 88%

Section: Kinetic Process Of P Exchange Between Sediments and Porewatermentioning

confidence: 99%

Kinetic Exchange of Remobilized Phosphorus Related to Phosphorus‐Iron‐Sulfur Biogeochemical Coupling in Coastal Sediment

Pan

Guo

Cai

et al. 2019

Water Resources Research

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“…2D gels realization in April allowed to validate and strengthen the link between iron and P cycle observed via core slicing profile within the upper part of the sediment in Marans (Fig. 4) (Pan et al, 2019). Moreover, the overall trend of Fe d to increase in depth, as for Mn d , suggested more favourable redox conditions for the OM mineralization via the iron reduction route.…”

Section: Spring Time Evolutionsupporting

confidence: 62%

Coupling between sediment biogeochemistry and phytoplankton development in a temperate freshwater marsh (Charente-Maritime, France): Evidence of temporal pattern

et al. 2021

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In freshwater systems, sediment can be an important source for the internal loading of phosphate (PO 4 ). The limiting character of this element in such system leads to consider this phenomenon in terms of eutrophication risks and water quality stakes. A four-months followup (January, March, April and May 2019) was carried out in a strong PO 4 limited secondary channel from an artificial irrigation system of Charente Maritime (France) to link the mobilization of remineralization products in the upper 6 cm layer of sediment (conventional core slicing/centrifugation and DET probes) and the phytoplankton biomass dynamics in the water column. Results showed congruent patterns between the temporal succession of the organic matter mineralization processes in the sediment and the primary biomass dynamics in the water column. In January and March (considered in winter), PO 4 proved to be retained by adsorption onto iron oxides in anoxic sediment since pore water nitrate inhibited for about a month the respiration of metal oxides in the first cm of sediment, thus limiting PO 4 availability and the phytoplankton growth. In April and May (early spring), after exhaustion of pore water nitrate, the dissolutive reduction of iron oxides released PO 4 into pore water generated a significant diffusive outgoing flux from the sediment to the water column with a maximum in April (-1.10E-04±2.81E-05 nmol cm -2 s -1 ). This release coincided with the nanophytoplankton bloom (5.50 µg Chla L -1 ) and a potential increase of PO 4 concentration in the water column. This work provides some insight on the importance of benthic-pelagic coupling in anthropogenic systems. This conceptual model has to be deployed on other sites of interest where internal loading of P takes precedence over external inputs and nitrate mitigation drives its benthic recycling and ultimately its bioavailability. This is to be essential to characterize the aquatic environment quality in order to limit eutrophication risks.

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“…The main bacteria present were archaea methanogens ( Acidobacteria, Bacteroidetes, Chloroflexi, Firmicutes, Proteobacteria, and Synergistetes), some of which contributed to the cycling of S, nitrogen (N), and carbon (C). Pan et al (2019) characterized labile phosphorus (P), S, and Fe in sediment porewater from an Estuary in China to learn more about biogeochemical processes involving P, S, and Fe. They observed that P activity is heavily influenced by Fe redox cycling and that tide‐induced redox changes influence reoxidation and formation of sulfide in surficial sediment.…”

Section: Assessmentmentioning

confidence: 99%

Contaminated aquatic sediments

Jaglal¹

2020

Water Environment Research

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Jawed and Krantzberg (2019) identified best practices to follow when remediating sediment sites based on experience gained at the Randle Reef Site in Ontario, Canada. The authors identify a list of challenges to overcome that fall under a broad series of headings that include issues associated with social, regulatory, political, and technical topics. Bianchini, Cento, Guzzini, Pellegrini, and Saccani (2019) reviewed more than 150 historical articles, written over the previous 50 years, to identify alternative

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Effects of tide and season changes on the iron-sulfur-phosphorus biogeochemistry in sediment porewater of a mangrove coast

Cited by 53 publications

References 64 publications

Kinetic Exchange of Remobilized Phosphorus Related to Phosphorus‐Iron‐Sulfur Biogeochemical Coupling in Coastal Sediment

Kinetic Exchange of Remobilized Phosphorus Related to Phosphorus‐Iron‐Sulfur Biogeochemical Coupling in Coastal Sediment

Coupling between sediment biogeochemistry and phytoplankton development in a temperate freshwater marsh (Charente-Maritime, France): Evidence of temporal pattern

Contaminated aquatic sediments

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