Litho-climatic characteristics and its control over mangrove soil geochemistry: A macro-scale approach

Ferreira, Tiago Osório; Queiroz, Hermano Melo; Nóbrega, Gabriel Nuto; Júnior, Valdomiro Severino de Souza; Barcellos, Diego; Ferreira, Amanda Duim; Otero, Xosé Luís

doi:10.1016/j.scitotenv.2021.152152

Cited by 26 publications

(25 citation statements)

References 117 publications

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“…These soil pH values are common for mangrove soils [22,33,51]. Within mangrove soils, the constant influence of seawater via tidal activity, root exudates, bioturbation, biogenic carbonates, and redox oscillations results in soil pH values that can vary between ~6.5 and 7.0 [22,33,51,52]. Thus, despite the significant pH variation, this did not reflect significant variations in the SQ score associated with the pH; the observed values are plausible for mangrove ecosystems.…”

Section: Discussionmentioning

confidence: 84%

“…For example, the soil pH values observed in the study plots ranged from 6.3 to 7.7 (Table 2). These soil pH values are common for mangrove soils [22,33,51]. Within mangrove soils, the constant influence of seawater via tidal activity, root exudates, bioturbation, biogenic carbonates, and redox oscillations results in soil pH values that can vary between ~6.5 and 7.0 [22,33,51,52].…”

Section: Discussionmentioning

confidence: 99%

“…Given the importance of anaerobic metabolism in the diverse soil functions of mangrove soils [84][85][86], future studies should consider other biological indicators in the minimum dataset, such as microbial biomass carbon and the enzymatic activity of β-glucosidase, both of which already have scoring curves in the algorithms within the SMAF spreadsheet. Additionally, other chemical indicators (e.g., the Fe and S content) may play a key role in predicting soil functions because the quantity of these elements directly affects important soil processes within mangrove soils (e.g., pyritization) [51,87]. These indicators are not available in the current version of the SMAF spreadsheet; therefore, developing reliable scoring curves for new indicators such as these is a challenging task for future soil quality research in mangrove soils.…”

Section: Discussionmentioning

confidence: 99%

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Applying the Soil Management Assessment Framework (SMAF) to Assess Mangrove Soil Quality

et al. 2022

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Soil quality (SQ) refers to its capacity to perform its functions. Thus, the SQ index (SQI) is a potentially useful tool for monitoring soil changes induced by mangrove restoration initiatives. Although the soil management assessment framework (SMAF) is a well-developed tool for SQ assessments in diverse ecosystems, it has never been tested on mangrove soils. In this study, we tested the SMAF to evaluate the shifts in the SQ of mangroves in a reforestation initiative using three- and seven-year plantations, which were compared with degraded and mature mangroves. A minimum dataset, composed of the pH and available P as chemical indicators, bulk density as a physical indicator, and soil organic carbon as a biological indicator, was used to calculate the SQI. The SMAF scores facilitated the monitoring of improvement in the mangrove SQ with vegetation development, mainly driven by physical and biological indicators. The SMAF may be a useful tool for monitoring SQ in mangroves under protection and recovery initiatives. Nevertheless, we suggest the inclusion of additional biological and chemical indicators in the minimum dataset for future studies to better represent specific processes and functions (e.g., microbial redox reactions and contaminant immobilization) that can alter the SQ of mangroves.

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Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Applying the Soil Management Assessment Framework (SMAF) to Assess Mangrove Soil Quality

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“…4) registered in these soil compartments are also likely related to the weathering of Fe-bearing primary minerals in the surrounding watershed soils (Souza-Júnior et al, 2008). Additionally, the higher Oxy-Fe contents in the SE coastal soils (Table 2) corroborate a more efficient source of Fe in this geological setting (Ferreira et al 2022).…”

Section: Effects Of the Geological And Bioclimatic Settings On The Ge...mentioning

confidence: 76%

“…On the other hand, on the SE coast, the weathering of Fecontaining minerals (e.g., biotite; Fig. 4) sourced from the Serra do Mar outcrops favors the formation of Fe oxides and their deposition in the estuary (Ferreira et al, 2022). The peaks of goethite (Fig.…”

Section: Effects Of the Geological And Bioclimatic Settings On The Ge...mentioning

confidence: 99%

Masked diversity and contrasting soil processes in tropical seagrass meadows: the control of environmental settings

Nóbrega

Otero

Romero³

et al. 2022

Preprint

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Abstract. Seagrass meadows are among the most valuable ecosystems on Earth. However, in tropical countries, there is a substantial knowledge gap on “seagrass science”. To address this gap, seagrass soils from three Brazilian coastal regions were investigated (the NE, SE, and S coasts). Soil profiles from different geological and bioclimatic settings were sampled, described, and analyzed. Detailed macromorphological descriptions, soil classification, physicochemical analysis (soil particle size, soil pH, pHoxidation, Eh, total organic carbon; TOC), Fe partitioning, and X-ray diffractometry were performed. Water samples were analyzed for pH, salinity, and ion concentrations. Different environmental settings in the coastal compartments produced contrasting geochemical conditions, which caused different intensities of pedogenetic processes. On the NE coast, the denser plant coverage favored higher TOC contents (2.5±0.1 %) and an anaerobic environment (Eh = +134 ± 142 mV), prone to an intense sulfidization (i.e., pyritic Fe formation; Py-Fe). Py-Fe contents in NE soils were 6-fold and 2-fold higher than those in the SE and S coastal soils, respectively. Conversely, lower TOC contents (0.35 ± 0.15 %) and a suboxic environment (Eh +203 ± 55 mV) in the SE soils, along with the Fe-rich geological surroundings, decreased the intensity of gleization. The contrasting intensities in the soil processes, related to the (seemingly subtle) differences in the geochemistry of each environment, ultimately caused relevant pedodiversity among the studied sites. Our findings contribute to a better understanding of the general functioning of tropical seagrass meadows but also have important environmental implications for studies focused on carbon sequestration in these ecosystems.

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Preservation of soil organic carbon in coastal wetlands promoted by glomalin–iron–organic carbon ternary system

Zhao

Jia

et al. 2022

Limnology & Oceanography

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Iron‐bound soil organic carbon (Fe‐bound SOC) and microbial residues are vital for SOC preservation, a process crucial for drawdown of anthropogenic carbon. However, the relative importance of Fe‐bound SOC in coastal wetlands, and its interaction with microbial residues remain poorly understood. Here, we used glomalin as a proxy for microbial residues, with the goal of determining microbial residues binding to Fe and Fe‐bound SOC across a 1000 km coastline of China including seven typical mangrove wetlands. As hypothesized, it was found that the glomalin fraction was strongly associated with and likely bound to Fe‐bound SOC complexes, which accounted for 21.4% ± 1.6% of mangrove SOC. Mean level of Fe‐bound glomalin was 1.2 ± 0.1 mg cm−3, accounting for 40.6% ± 1.5% of total glomalin and 35.4% ± 3.2% of Fe‐bound SOC in the top 10 cm mangrove soil layer at regional scale. Due to the growing realization that Fe may be a crucial factor of glomalin cycling, we performed multiple chemical characterization techniques to identify the association between Fe and glomalin. Our results suggested that association to Fe was a main stabilization mechanism of glomalin in soils, and glomalin served as organic ligands in the formation of Fe‐bound SOC. We also found that the bulk glomalin extracts were a glomalin–Fe–OC ternary complex, which constituted an important proportion of mangrove SOC. These findings highlight the important effect of glomalin bound to Fe as a major mechanism of SOC persistence in coastal wetlands.

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Litho-climatic characteristics and its control over mangrove soil geochemistry: A macro-scale approach

Cited by 26 publications

References 117 publications

Applying the Soil Management Assessment Framework (SMAF) to Assess Mangrove Soil Quality

Applying the Soil Management Assessment Framework (SMAF) to Assess Mangrove Soil Quality

Masked diversity and contrasting soil processes in tropical seagrass meadows: the control of environmental settings

Preservation of soil organic carbon in coastal wetlands promoted by glomalin–iron–organic carbon ternary system

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