Denitrification activity in mangrove sediments varies with associated vegetation

Fernandes, Sheryl Oliveira; Dutta, Pinky; Gonsalves, Maria–Judith; Bonin, Patricia; LokaBharathi, P.A.

doi:10.1016/j.ecoleng.2016.06.102

Cited by 15 publications

(12 citation statements)

References 47 publications

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“…The potential rate of denitrification measured in the mangrove soils (8.1 ng N g -1 h -1 ) was within the range of that previously found for mangroves in China and India (5.6 to 1307.3 ng N g -1 h -1 ) (Fernandes et al, 2010;Fernandes et al, 2016;Fernandes et al, 2013;Xiao et al, 2018;Zhang et al, 2020). The rate was at the low end of this range showing that this mangrove system does not have a high N removal capacity through denitrification.…”

Section: Comparison Of N Removal Potential To Other Ecosystemssupporting

confidence: 81%

Restoration impacts on rates of denitrification and greenhouse gas fluxes from tropical coastal wetlands

Comer‐Warner

Nguyen²,

Nguyen³

et al. 2022

Science of The Total Environment

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Section: Comparison Of N Removal Potential To Other Ecosystemssupporting

confidence: 81%

Restoration impacts on rates of denitrification and greenhouse gas fluxes from tropical coastal wetlands

Comer‐Warner

Nguyen²,

Nguyen³

et al. 2022

Science of The Total Environment

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“…Hydroperiod and soil redox potential have a tremendous influence on the unfolding of the elemental cycling. In medium to high intertidal systems burial of available P in sediments (Alongi, 2009;Twilley, 2009), and partial N losses due to anaerobic ammonium oxidation (anammox) and denitrification (Fernandes et al (2016)) will rather dominate. In low intertidal systems N/P transformation into mangrove biomass (Twilley, 2009), but also a likely surge in the out-welling of particulate and organic N/P into connected coastal ecosystems will prevail.…”

Section: Up-stream Threats To Mangrovesmentioning

confidence: 99%

Individual-based modeling of mangrove forest growth: MesoFON – Recent calibration and future direction

Grueters

Ibrahim

Satyanarayana

et al. 2019

Estuarine, Coastal and Shelf Science

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A R T I C L E I N F O Keywords:Individual-based model Model purpose Mangrove threats Model calibration Rhizophora apiculata IBMbedding A B S T R A C TWe introduce individual-based models (IBMs) of mangrove forests and criticize the tasks for their development recommended previously for being mostly related to natural threats. This is contrasted with our perspective that the key research question of today's models should be to mitigate anthropogenic threats.Core objective (1) of this article is to provide a review of mangrove threats prioritizing solution-oriented IBM approaches. Because species-specific calibration of IBMs is time-consuming, efficiency is crucial. Globally, we identify an urgent need to parametrize Asian mangrove species.We suggest IBMs to unveil management scenarios with maximum sustainable timber yield to prevent mangrove conversion and over-exploitation. The key model purpose regarding natural threats is to govern the management of mangrove forest stability for coastal protection using a combination of windthrow models and IBMs. We argue for the embedding of IBMs in ecosystem models to achieve purposes regarding eutrophication and altered hydrology/sedimentation. Core objective (2) is to describe the development of the new IBM mesoFON from a task-to a solution-oriented model. Initially, the interaction of lateral crown displacement and hurricane impacts was examined with mesoFON. Later, we introduced propagule production & local dispersal with the task to close the tree life cycle. Here, we describe the change in purpose of mesoFON accompanying its calibration for Rhizophora apiculata in Malaysia. For this we applied a Genetic Algorithm optimizer, used mesoFON as a "way-back machine", initialized it with observed tree diameters/positions and shrank the trees backwards in time.Objective (3) is to describe mesoFON's future direction: Embedding in the General Ecosystem Model (Fitz et al., 1996) and targeting the solution of threats at larger spatial scales. Finally, we demonstrate that the new model simulates overland waterflow qualitatively right even in benchmark settings.

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“…Mangrove sediments, usually rich in organic matter and largely anoxic, have been sites for wastewater disposal (Kathiresan and Bingham, 2001). Interest in the nitrate reduction capacity of mangrove sediments has been growing and has been the subject of numerous studies conducted mainly on terrestrial mangroves (Fernandes et al, 2012a;Fernandes et al, 2016). Due to their hydromorphism and the accumulation of organic matter, mangrove sediments and soils are known to be potentially active reducing zones for nitrogen removal (Fernandes et al, 2016) used to treat nitrogen rich wastewater (Corredor and Morell, 1994;Shiau et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Potential Nitrate Reduction Rates in Marine Mangrove Sediments in the Lesser Antilles

Laverman¹,

Sébilo

Tocny

et al. 2021

Preprint

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Mangrove sediments are generally nitrogen limited, with nitrate reduction to ammonium instead of denitrification in these sediments, resulting in nitrogen retention rather than nitrogen elimination. The goal of this work was to investigate the potential for nitrate reduction in marine mangrove sediments along a canal impacted by anthropogenic activity (Guadeloupe, West Indies) as a function of increased nitrogen load and how this would change nitrate transformation rates. In addition to that, the impact of the organic carbon load and the hydraulic retention time was assessed as factors affecting nitrate reduction rates. Potential nitrate reduction rates in the sediments along the canal, in the presence of indigenous organic carbon, ranged from 126 to 379 nmol cm‑3 h-1 generally increasing upon increasing supplied nitrate. The potential for nitrate reduction increased significantly with the addition of mangrove leaves, whereas the addition of simple, easily degradable carbon (acetate), resulted in an almost five-fold increase in nitrate reduction rates. The hydraulic retention time also had an impact on the nitrate reducing capacity due to an increased contact time between nitrate and the benthic microbial community. Marine mangrove sediments have a high potential to mitigate nitrogen pollution, mainly governed by the presence of large amounts of degradable carbon in the form of litter. The hydraulic retention time as tested experimentally that can be extrapolated to the time of inundation of the mangrove sediments may increase the potential for nitrate reduction. Whereas the sediments are daily exposed to a small tidal effect, increased water retention could increase the nitrogen elimination potential in these mangrove sediments.

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Denitrification activity in mangrove sediments varies with associated vegetation

Cited by 15 publications

References 47 publications

Restoration impacts on rates of denitrification and greenhouse gas fluxes from tropical coastal wetlands

Restoration impacts on rates of denitrification and greenhouse gas fluxes from tropical coastal wetlands

Individual-based modeling of mangrove forest growth: MesoFON – Recent calibration and future direction

Potential Nitrate Reduction Rates in Marine Mangrove Sediments in the Lesser Antilles

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