The sources and distribution of carbon (DOC, POC, DIC) in a mangrove dominated estuary (French Guiana, South America)

Ray, Raghab; Michaud, Emma; Aller, Robert C.; Vantrepotte, Vincent; Gleixner, Gerd; Walcker, Romain; Devesa, Jérémy; Goff, Manon Le; Morvan, Sylvain; Thouzeau, Gérard

doi:10.1007/s10533-018-0447-9

Cited by 48 publications

(46 citation statements)

References 80 publications

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“…Principally, the product of water flow volume and mangrove-derived DIC and DOC concentration should provide an estimate of DIC and DOC flux from the mangrove estuary alone. In the present study, a simple two-component conservative mixing model was applied [13].…”

Section: Estimation Of Dic and Doc Flux From The Mangrove Estuarymentioning

confidence: 99%

“…These data were not the estimation of solely mangrove-derived C export but of net C exchange (inwellings-outwellings) that may include contributions from external systems, such as terrestrial, riverine, and oceanic systems. Bouillon et al [10] also revealed that benthic mineralization as a part of Rh and subsequent export as dissolved inorganic C (DIC) could represent a very significant and unaccounted flux of mangrove-derived C. Recent studies (e.g., [11][12][13]) confirmed that most of the carbon being tidally exported from mangrove forest is DIC, a result of organic matter mineralization and porewater input from mangrove ecosystems. These studies suggest that DIC outwelling as the part of the Rh appears to be a common phenomenon in mangrove forests and that previous studies of mangrove NEP, which did not consider the potential impact of tidal effect, may greatly overestimate the NEP (e.g., [5,6,14]).…”

Section: Introductionmentioning

confidence: 99%

“…For example, Miyajima et al [17] quantitatively estimated the DIC exported from an estuary in Southeast Asian mangrove forest using isotope mass-balancing models for δ 13 C-DIC. They revealed that 13 C-depleted DIC inputs from the riverside mangrove and the concentration of mangrove-derived DIC at the estuary were estimated to be as high as 856 µmol L −1 . Although aquatic lateral C fluxes may offset huge NEP values, there are few studies concerning mangrove C budgets, including aquatic lateral C fluxes, partly due to the difficulty in constraining mangrove area-based estimates of lateral C fluxes.…”

Section: Introductionmentioning

confidence: 99%

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Lateral Export of Dissolved Inorganic and Organic Carbon from a Small Mangrove Estuary with Tidal Fluctuation

Ohtsuka

Onishi

Yoshitake

et al. 2020

Forests

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The significance of aquatic lateral carbon (C) export in mangrove ecosystems highlights the extensive contribution of aquatic pathways to the net ecosystem carbon budget. However, few studies have investigated lateral fluxes of dissolved organic carbon (DOC) and inorganic carbon (DIC), partly due to methodological difficulty. Therefore, we evaluated area-based lateral C fluxes in a small mangrove estuary that only had one exit for water exchange to the coast. We sampled water from the mouth of the creek and integrated discharge and consecutive concentration of mangrove-derived C (ΔC). Then, we estimated the area-normalized C fluxes based on the inundated mangrove area. DIC and DOC concentrations at the river mouth increased during ebb tide during both summer and winter. We quantified the ΔC in the estuary using a two-component conservative mixing model of freshwater and seawater. DIC and DOC proportions of ΔC concentrations at the river mouth during ebb tide was between 34% and 56% in the winter and 26% and 42% in the summer, respectively. DIC and DOC fluxes from the estuary were estimated to be 1.36 g C m−2 d−1 and 0.20 g C m−2 d−1 in the winter and 3.35 g C m−2 d−1 and 0.86 g C m−2 d−1 in the summer, respectively. Based on our method, daily fluxes are mangrove area-based DIC and DOC lateral exports that can be directly incorporated into the mangrove carbon budget.

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Section: Estimation Of Dic and Doc Flux From The Mangrove Estuarymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lateral Export of Dissolved Inorganic and Organic Carbon from a Small Mangrove Estuary with Tidal Fluctuation

Ohtsuka

Onishi

Yoshitake

et al. 2020

Forests

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“…Leaching of mangrove plant materials through surface and pore water export are generally recognized as the major pathways of DOC transport into the mangrove-dominated coastal waters (Bouillon et al, 2007;Dittmar and Lara, 2001;Troxler et al, 2015). Below ground properties, such as mangrove pore water generally contains 2-3 times higher DOC concentration than overlying water (Ray et al, 2018a) accelerating DOC export via tidal pumping and seepage. However, our previous results at Qeshm mangroves showed such terrigenous DOC output less effective than marine DOC input (Ray and Shahraki, 2016).…”

Section: Role Of Mangroves In Doc Exportmentioning

confidence: 99%

“…These intertidal creeks play an important role in exporting carbon and nutrients through flushing of litter, coarse wood debris, and benthic algae (such as microphytobenthos) or importing them as marine algae within a tidal cycle, thus maintain the productivity of the system (Kristensen and Suraswadi, 2002;Bouillon et al, 2007). Although there are several significant reports about sources and transport of DOC and POC in mangrove dominated coastal systems (Bouillon et al, 2007;Maher et al, 2013;Ho et al, 2017;Ray et al, 2015Ray et al, , 2018a, there is a gap in understanding their distribution among different habitats and intertidal creeks. The biogeochemistry of organic carbon (OC) as a function of the presence or absence of mangrove vegetation alongside tidal creeks is particularly important to understand in the context of estuarine and ocean carbon cycles.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and habitat-wise variations of creek water particulate and dissolved organic carbon in arid mangrove (the Persian Gulf)

Ray

Weigt

2018

Continental Shelf Research

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A B S T R A C TThe present study examines the effect of mangrove vegetation and different seasons on organic carbon pools, distributions, and source compositions under the stressed hydro-climatological settings of the Iranian coast (Persian Gulf). Significant seasonal and spatial differences were detected only for the δ 13 POC (particulate organic carbon) owing to the fluctuation of its sources. Five end-member particulate organic carbon sources (POC) (mangrove leaf, planktonic particles, zooplankton, microphytobenthos (MPB), and sediment) contributed to the POC pool at different levels depending on their seasonal and site-specific abundance. Variations in topographic features such as, the elevations of mangrove and non-mangrove creeks, appeared to play an important role in regulating POC concentrations but not DOC concentrations. Planktonic particles contributed to the POC pool (maximum 10-65%) at the mangrove sites mostly in the summer whereas the contributions of sediment and MPB (5-35%) increased in winter. Iranian mangroves are weak exporters of carbon to the Persian Gulf where mangrove plant materials (leaf, litter) had little contributions to the POC and DOC pool (5-25% and 8-15%, respectively). It is most likely that OC export in these arid regions are limited by low rainfall and river input. Finally, seasonality and site-specific activity largely control OC dynamics in these relatively understudied arid mangroves.

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Dissolved and particulate carbon export from a tropical mangrove‐dominated riverine system

Ray

Miyajima

Watanabe

et al. 2021

Limnology & Oceanography

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Despite being a major component in the mangrove carbon (blue carbon) budget, "outwelling" flux (or export to the sea) has gained little attention relative to other biogeochemical fluxes and reservoir carbon stock estimations. This study aims to estimate lateral exchange fluxes of dissolved and particulate organic carbon (DOC, POC) and dissolved inorganic carbon (DIC) from the watershed through a microtidal mangrove-dominated estuary to the coastal sea in Panay Island, Philippines. Along the estuarine transect, consistent addition of DOC, DIC, and POC at higher salinities were attributed to mangrove organic matter input. Upstream groundwater input (carbonate weathering) and downstream mangrove organic matter decomposition (possibly sulfate reduction) were the main controls on DIC. DOC corresponded to relatively pure mangrove sources in creek water, while POC was a mixture of detrital and algal organic matter. The mangrove system acted as net exporter of carbon to the sea in both dry and wet seasons. From short-term observations, outwelling fluxes of mangrovederived DOC, DIC, and POC contributed 27-53%, 8-31%, and 42%, respectively, to their estuarine outflow. Unlike other studies, such low percentage for DIC might result from other external nonmangrove input (e.g., watershed carbonate weathering). Overall estuarine carbon flux was dominated by DIC (90-95%) with only minor contribution from DOC. The approach utilized in this study to estimate lateral carbon flux specific to a small mangrove setting can be useful in delineating blue carbon budgets that avoid geographical and methodological biases.

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The sources and distribution of carbon (DOC, POC, DIC) in a mangrove dominated estuary (French Guiana, South America)

Cited by 48 publications

References 80 publications

Lateral Export of Dissolved Inorganic and Organic Carbon from a Small Mangrove Estuary with Tidal Fluctuation

Lateral Export of Dissolved Inorganic and Organic Carbon from a Small Mangrove Estuary with Tidal Fluctuation

Seasonal and habitat-wise variations of creek water particulate and dissolved organic carbon in arid mangrove (the Persian Gulf)

Dissolved and particulate carbon export from a tropical mangrove‐dominated riverine system

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