The role of reactive iron in long-term carbon sequestration in mangrove sediments

Dicen, Gerald P.; Navarrete, Ian A.; Rallos, Roland V.; Salmo, Severino G.; Garcia, Maria Carmela A

doi:10.1007/s11368-018-2051-y

Cited by 36 publications

(22 citation statements)

References 55 publications

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“…Similarly important roles that reactive Fe plays in the stabilization of OM have been reported in estuarine sediments [57,58]. Following these studies, Dicen et al for the first time investigated the role of reactive Fe in mangrove soils [39]. They found that on average 15% of organic C in the studied cores is directly bound to reactive Fe, corroborating the findings in estuarine and marine sediments.…”

Section: Mineral Soils: Interactions With Soil Minerals or Metalssupporting

confidence: 67%

“…Although they are well described in soils and sediments [31,32,38], relevant studies in mangrove soils are surprisingly sparse. We could find only one recent study that investigated the role of reactive Fe in mangrove soils [39] (discussed below). The sorptive interactions of OM with mineral surfaces occur through various mechanisms such as ligand exchange, polyvalent cation bridges, ion exchanges, and other weak interactions including van der Waals forces, hydrophobic interactions, and proton binding [32,40].…”

Section: Mineral Soils: Interactions With Soil Minerals or Metalsmentioning

confidence: 99%

“…Since both Fe and Al exist mostly as (oxy)hydroxides in mangrove soils with neutral pH values, pH is not expected to have as much influence on coprecipitation as in acidic forest soils [63]. Studies that applied the Fe reduction method to sediments often show high molar Fe:OC ratios for the co-extracted species, suggesting that associations between OM and Fe are primarily through coprecipitation in these environments [39,55,57]. Specific mechanisms behind the OM stabilization by coprecipitation remain elusive.…”

Section: Mineral Soils: Physical Protectionmentioning

confidence: 99%

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Organic Carbon Stabilization Mechanisms in Mangrove Soils: A Review

Kida

Fujitake

2020

Forests

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Despite the recognized organic carbon (OC) sequestration potential of mangrove forests, the ongoing climate change and anthropogenic disturbances pose a great threat to these ecosystems. However, we currently lack the ability to mechanically understand and predict the consequences of such impacts, primarily because mechanisms underlying OC stabilization in these ecosystems remain elusive. Research into OC stabilization has focused on terrestrial soils and marine sediments for decades, overlooking the vegetated coastal ecosystems including mangroves. In terrestrial soils and marine sediments, it is widely accepted that OC stabilization is the integrated consequence of OM’s inherent recalcitrance, physical protection, and interactions with minerals and metals. However, related discussion is rarely done in mangrove soils, and recalcitrance of roots and high net ecosystem production (high primary production and low heterotrophic respiration) have been considered as a primary OC sequestration mechanism in mangrove peat and mineral soils, respectively. This review presents the available information on the mechanisms underlying OC stabilization in mangrove soils and highlights research questions that warrant further investigation. Primary OC stabilization mechanisms differ between mangrove peat and mineral soils. In mangrove mineral soils, physico-chemical stabilization processes are important, yet grossly understudied OC stabilization mechanisms. In mangrove peat, recalcitrance of mangrove roots and the inhibition of phenoloxidase under the anoxic condition may be the primary OC stabilization mechanisms. Salinity-induced OC immobilization likely plays a role in both type of soils. Finally, this review argues that belowground production and allochthonous inputs in mangrove forests are likely underestimated. More studies are needed to constrain C budgets to explain the enigma that mangrove OC keeps accumulating despite much higher decomposition (especially by large lateral exports) than previously considered.

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Section: Mineral Soils: Interactions With Soil Minerals or Metalssupporting

confidence: 67%

Section: Mineral Soils: Interactions With Soil Minerals or Metalsmentioning

confidence: 99%

Section: Mineral Soils: Physical Protectionmentioning

confidence: 99%

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Organic Carbon Stabilization Mechanisms in Mangrove Soils: A Review

Kida

Fujitake

2020

Forests

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“…In this sense, new studies focused on physicochemical (redox potential and pH) changes after revegetation are essential to assess the effects of these changes on the reestablishment of carbon stock. For example, oxygen diffusion to plant roots, oxidizing the rhizosphere [51] oxidize soluble Fe(II), leading to the formation of oxyhydroxides that may act on soil organic matter stabilization in mangrove soils [52][53][54][55].…”

Section: Resultsmentioning

confidence: 99%

Soil Organic Matter Responses to Mangrove Restoration: A Replanting Experience in Northeast Brazil

Jimenez

Queiroz

Otero

et al. 2021

IJERPH

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Mangroves are among the most relevant ecosystems in providing ecosystem services because of their capacity to act as sinks for atmospheric carbon. Thus, restoring mangroves is a strategic pathway for mitigating global climate change. Therefore, this study aimed to examine the organic matter dynamics in mangrove soils during restoration processes. Four mangrove soils under different developmental stages along the northeastern Brazilian coast were studied, including a degraded mangrove (DM); recovering mangroves after 3 years (3Y) and 7 years (7Y) of planting; and a mature mangrove (MM). The soil total organic carbon (CT) and soil carbon stocks (SCSs) were determined for each area. Additionally, a demineralization procedure was conducted to assess the most complex humidified and recalcitrant fractions of soil organic matter and the fraction participating in organomineral interactions. The particle size distribution was also analyzed. Our results revealed significant differences in the SCS and CT values between the DM, 3Y and 7Y, and the MM, for which there was a tendency to increase in carbon content with increasing vegetative development. However, based on the metrics used to evaluate organic matter interactions with inorganic fractions, such as low rates of carbon enrichment, C recovery, and low C content after hydrofluoric acid (HF) treatment being similar for the DM and the 3Y and 7Y—this indicated that high carbon losses were coinciding with mineral dissolution. These results indicate that the organic carbon dynamics in degraded and newly planted sites depend more on organomineral interactions, both to maintain their previous SCS and increase it, than mature mangroves. Conversely, the MM appeared to have most of the soil organic carbon, as the stabilized organic matter had a complex structure with a high molecular weight and contributed less in the organomineral interactions to the SCS. These results demonstrate the role of initial mangrove vegetation development in trapping fine mineral particles and favoring organomineral interactions. These findings will help elucidate organic accumulation in different replanted mangrove restoration scenarios.

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“…5) suggest an imminent decline in the ecosystem services provided by the impacted mangrove forests, especially regarding carbon sequestration and contaminant immobilization. As Fe oxyhydroxides contribute to soil organic matter stabilization (Dicen et al 2019;Sun et al 2019; Fujitake 2020), the lower Fe content in the dead mangrove soils (Fig. 7) may affect this stabilization mechanism.…”

Section: Environmental Consequencesmentioning

confidence: 99%

Iron geochemistry in tropical estuarine soils affected by anthropic and natural disasters

Queiroz¹

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The role of reactive iron in long-term carbon sequestration in mangrove sediments

Cited by 36 publications

References 55 publications

Organic Carbon Stabilization Mechanisms in Mangrove Soils: A Review

Organic Carbon Stabilization Mechanisms in Mangrove Soils: A Review

Soil Organic Matter Responses to Mangrove Restoration: A Replanting Experience in Northeast Brazil

Iron geochemistry in tropical estuarine soils affected by anthropic and natural disasters

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