Carbon dynamics and inconstant porewater input in a mangrove tidal creek over contrasting seasons and tidal amplitudes

Taillardat, Pierre; Ziegler, Alan D.; Friess, Daniel A.; Wîdory, David; Vinh, Truong Van; David, Frank; Thành-Nho, Nguyễn; Marchand, Cyril

doi:10.1016/j.gca.2018.06.012

Cited by 55 publications

(69 citation statements)

References 71 publications

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“…However, despite the higher Revelle factors for pore water, groundwater, and freshwater, the Measured DIC in the present study (2127 ± 149 µmol kg -1 [mean ± SD]; range, 2045-2732 µmol kg -1 ; n = 31) was in agreement with the reported DIC ranges from other mangroveassociated waters that acted as net sources of CO2 (Zablocki et al, 2011;Linto et al, 2014;David et al, 2018;Ray et al, 2018b). DIC data from this study are comparable to DIC data reported from other stations in the Indian Sundarbans (Ray et al, 2018a), where pCO2(water) data indicated that those sites might be sources of CO2.…”

Section: Mechanisms For Influx or Reduced Efflux Of Co2supporting

confidence: 88%

“…In other words, the unit increase in pCO2(water) with respect to the unit input of DIC was much higher at the creek stations than at the IB and MR stations. Taillardat et al (2018) reported that in pore water, the longer residence time of water coupled with greater water turnover enhances the solute fraction, which in turn increases the pCO2(water). This phenomenon was found to take place in the creeks, where in the absence of rapid mixing, the mangrove water mass had a higher residence time compared to the island boundary and mid-river, where the pore water underwent rapid dilution with pCO2-lean seawater leading to a reduced Revelle factor.…”

Section: Mechanisms For Influx or Reduced Efflux Of Co2mentioning

confidence: 99%

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Low CO2 evasion rate from the mangrove surrounding waters of Sundarban

Akhand

Chanda

Watanabe

et al. 2019

Preprint

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Abstract. Globally, water bodies adjacent to mangroves are considered sources of atmospheric CO2. We directly measured the partial pressure of CO2 in water, pCO2(water), and other related biogeochemical parameters with very high (1-min) temporal resolution at Dhanchi Island in India&#8217;s Sundarbans during the post-monsoon season. We used elemental, stable isotopic, and optical signatures to investigate the sources of dissolved inorganic carbon (DIC) and organic matter (OM) in these waters. Diel mean pCO2(water) was marginally oversaturated in creeks (efflux, 69 &#177; 180&#8201;&#181;mol&#8201;m&#8722;2&#8201;h&#8722;1) and undersaturated along the island boundary and in the main river (influx, &#8722;17 &#177; 53 and &#8722;31 &#177; 73&#8201;&#181;mol&#8201;m&#8722;2&#8201;h&#8722;1, respectively) compared to the atmospheric CO2 concentration. The possibility in earlier studies of over- or underestimating the CO2 flux because of an inability to capture tidal minima and maxima was minimized in the present study, which confirmed that the waters surrounding mangroves in this region can act as a sink or a very weak source of atmospheric CO2. &#948;13C values for DIC suggest a mixed DIC source, and a three-end-member stable isotope mixing model and optical signatures of OM suggest negligible riverine contribution of freshwater to OM. We conclude that the CO2 sink or weak source character was due to a reduced input of riverine freshwater [which usually has high pCO2(water)] and the predominance of pCO2-lean water from the coastal sea, which eventually increases the buffering capacity of the water as evidenced by the Revelle factor. Up-scaling the CO2 flux data for all seasons and the entire estuary, we propose that the CO2 evasion rate observed in this study is much lower than the recently estimated world average. Mangrove areas having such low emissions should be given due emphasis when up-scaling the global mangrove carbon budget from regional observations.

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Section: Mechanisms For Influx or Reduced Efflux Of Co2supporting

confidence: 88%

Section: Mechanisms For Influx or Reduced Efflux Of Co2mentioning

confidence: 99%

Low CO2 evasion rate from the mangrove surrounding waters of Sundarban

Akhand

Chanda

Watanabe

et al. 2019

Preprint

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“…Mangrove forest organic carbon (OC) was transported towards the sea on the ebb tide as dissolved organic carbon (DOC) and suspended particulate organic carbon (sPOC), the ratio of sPOC and DOC ranging in average from 0.3 to 0.8 (Fig. 3); this is consistent with other reports where DOC was higher than sPOC in mangrove systems (Bouillon et al 2007;Dittmar and Lara 2001;Taillardat et al 2018). Dissolved organic carbon and sPOC was lower in Sungei Buloh than at other locations.…”

Section: Carbon Stocks Carbon In the Ebb Tide And Co 2 Fluxessupporting

confidence: 88%

Sources of Particulate Organic Matter across Mangrove Forests and Adjacent Ecosystems in Different Geomorphic Settings

et al. 2020

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Mangrove forests are among the world's most productive ecosystems and provide essential ecosystem services such as global climate regulation through the sequestration of carbon. A detailed understanding of the influence of drivers of ecosystem connectivity (in terms of exchange of suspended particulate organic matter), such as geomorphic setting and carbon stocks, among coastal ecosystems is important for being able to depict carbon dynamics. Here, we compared carbon stocks, CO 2 fluxes at the sediment-air interface, concentrations of dissolved organic carbon and suspended particulate organic carbon across a mangrove-seagrass-tidal flat seascape. Using stable isotope signatures of carbon and nitrogen in combination with MixSIAR models, we evaluated the contribution of organic matter from different sources among the different seascape components. Generally, carbon concentration was higher as dissolved organic carbon than as suspended particulate matter. Geomorphic settings of the different locations reflected the contributions to particulate organic matter of the primary producers. For example, the biggest contributors in the riverine location were mangrove trees and terrestrial plants, while in fringing locations oceanic and macroalgal sources dominated. Anthropogenic induced changes at the coastal level (i.e. reduction of mangrove forests area) may affect carbon accumulation dynamics in adjacent coastal ecosystems.

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“…The importance of nutrients recycling via mangrove-derived organic matter mineralization in sustaining coastal food webs in the Can Gio estuary was demonstrated in previous studies using fatty acid biomarkers and dual stable isotopes (δ 13 C and δ 15 N) (David et al, 2018a(David et al, , 2019. Additionally, higher NH 4 concentrations (Taillardat et al, 2019), pCO 2 and CO 2 emissions (David et al, 2018b;Taillardat et al, 2018;Vinh et al, 2019) were measured during the monsoon due to enhanced microbial activity. The monsoon also increased metal loads in the estuary (Thanh-Nho et al, 2018), and it was demonstrated that their transfer to the biota differed between mangrove stands (Thanh-Nho et al, 2019).…”

Section: Introductionmentioning

confidence: 88%

Changes in Leaf Litter Quality During Its Decomposition in a Tropical Planted Mangrove Forest (Can Gio, Vietnam)

Vinh

Allenbach²,

Linh

et al. 2020

Front. Environ. Sci.

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Mangroves are highly productive ecosystems, being key components of trophic food chains along tropical coastlines. In Southern Vietnam, planted Rhizophora apiculata develops in the upper intertidal zone, while Avicennia alba naturally colonizes areas at lower elevation along tidal creeks. The main objective of this study was to quantify the seasonal variability of leaf litter decomposition rates considering that in previous studies we observed a strong influence of the monsoon on C and nutrients cycling within the mangrove and in adjacent creeks. We were also interested in changes in the quality of the leaf litter during its decomposition, focusing on nutrients, δ 13 C, and trace metals. To reach our goals, we used the litterbag technique. During the monsoon, leaf litter decay rates were increased in the Avicennia stand, most probably because of enhanced leaching resulting from a higher level of the river due to heavy rainfall. In addition, the enhanced decay rates measured in the Avicennia stand during the rainy season resulted in a strong 13 C depletion, while 13 C enrichment was measured in the other conditions. Elemental concentrations changes during decay were not clearly influenced by season, but depended on the element considered. K, Mg, Na, and Ca had t 50 values lower than the one of the bulk material. P and S contents also rapidly decreased during the first decomposition stages, but these elements had longer t 50 values than the bulk leaves. Conversely, an enrichment in most trace metals was observed during leaf litter decomposition whatever the season. We suggest that these metals were either trapped from the water column and the forest floor by organic molecules composing the litter, or subjected to litter decomposers uptake. Consequently, this study shows that the release or the uptake of elements during mangrove leaf litter decomposition varied with different parameters, which may have ecological implications on the nature of the elements exported toward adjacent ecosystems, and on their primary productivity.

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Carbon dynamics and inconstant porewater input in a mangrove tidal creek over contrasting seasons and tidal amplitudes

Cited by 55 publications

References 71 publications

Low CO<sub>2</sub> evasion rate from the mangrove surrounding waters of Sundarban

Low CO<sub>2</sub> evasion rate from the mangrove surrounding waters of Sundarban

Sources of Particulate Organic Matter across Mangrove Forests and Adjacent Ecosystems in Different Geomorphic Settings

Changes in Leaf Litter Quality During Its Decomposition in a Tropical Planted Mangrove Forest (Can Gio, Vietnam)

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Carbon dynamics and inconstant porewater input in a mangrove tidal creek over contrasting seasons and tidal amplitudes

Cited by 55 publications

References 71 publications

Low CO&lt;sub&gt;2&lt;/sub&gt; evasion rate from the mangrove surrounding waters of Sundarban

Low CO&lt;sub&gt;2&lt;/sub&gt; evasion rate from the mangrove surrounding waters of Sundarban

Sources of Particulate Organic Matter across Mangrove Forests and Adjacent Ecosystems in Different Geomorphic Settings

Changes in Leaf Litter Quality During Its Decomposition in a Tropical Planted Mangrove Forest (Can Gio, Vietnam)

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Low CO<sub>2</sub> evasion rate from the mangrove surrounding waters of Sundarban

Low CO<sub>2</sub> evasion rate from the mangrove surrounding waters of Sundarban