Biogeochemical cycling of iron (hydr-)oxides and its impact on organic carbon turnover in coastal wetlands: A global synthesis and perspective

Yu, Chengqun; Xie, Shucheng; Song, Zhaoliang; Xia, Shaopan; Åström, Mats E.

doi:10.1016/j.earscirev.2021.103658

Cited by 74 publications

(37 citation statements)

References 187 publications

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“…Our data set here represents the most comprehensive assessment of measured organic C density and sequestration inventory of coastal wetlands in China. Our study used 100 cm as an ideal sampling depth to identify the SOC density and sequestration stock (Howard et al, 2017), Xia, Song, et al, 2021). This highlights the importance of both broad and small spatial-scale data in understanding differences in C stocks under natural scenarios and estimating regional wetland C stocks.…”

Section: Soil Organic Carbon Inventories In China's Coastal Wetlandsmentioning

confidence: 98%

Storage, patterns and influencing factors for soil organic carbon in coastal wetlands of China

Xia

Song

Zwieten

et al. 2022

Global Change Biology

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Soil organic carbon (SOC) in coastal wetlands, also known as "blue C," is an essential component of the global C cycles. To gain a detailed insight into blue C storage and controlling factors, we studied 142 sites across ca. 5000 km of coastal wetlands, covering temperate, subtropical, and tropical climates in China. The wetlands represented six vegetation types (Phragmites australis, mixed of P. australis and Suaeda, single Suaeda, Spartina alterniflora, mangrove [Kandelia obovata and Avicennia marina], tidal flat) and three vegetation types invaded by S. alterniflora (P. australis, K. obovata, A. marina). Our results revealed large spatial heterogeneity in SOC density of the top 1-m ranging 40-200 Mg C ha −1 , with higher values in mid-latitude regions (25-30° N) compared with those in both low-(20°N) and high-latitude (38-40°N) regions.Vegetation type influenced SOC density, with P. australis and S. alterniflora having the largest SOC density, followed by mangrove, mixed P. australis and Suaeda, single Suaeda and tidal flat. SOC density increased by 6.25 Mg ha −1 following S. alterniflora invasion into P. australis community but decreased by 28.56 and 8.17 Mg ha −1 following invasion into K. obovata and A. marina communities. Based on field measurements Liaoning 97.47 0-40 54.34 ± 12.51 Liao River Delta (LRD)

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Section: Soil Organic Carbon Inventories In China's Coastal Wetlandsmentioning

confidence: 98%

Storage, patterns and influencing factors for soil organic carbon in coastal wetlands of China

Xia

Song

Zwieten

et al. 2022

Global Change Biology

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“…1). The higher values of Fe-PY and DOP in this season may be related to an increase in the activity of iron and sulfate reducing bacteria, which is favored by higher temperatures leading to the formation of iron sulfides (e.g., pyrite; Hao et al 1996;Yu et al 2021). Additionally, plant's activity also are increased under higher temperatures which may also fuel the formation of pyrite through the exudation of organic acids by the roots (Wang et al 2014).…”

Section: Iron Biogeochemistry In Southeast Mangrovesmentioning

confidence: 98%

“…These metabolic pathways (denitrification, manganese reduction, and iron reduction, respectively), have traditionally been considered less important in mangrove soils (Alongi et al 2000(Alongi et al , 2004a, although they are energetically more favorable than sulfate reduction. However, different research suggests that in mangrove soils, the role of iron reduction in organic carbon mineralization may be similar or even greater than that of bacterial sulfate reduction (Kasten and Jørgensen 2000;Pan et al 2019;Alongi 2020;Yu et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Windsock behavior: climatic control on iron biogeochemistry in tropical mangroves

et al. 2021

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Iron is one of the most abundant elements on the planet and a micronutrient for most organisms. In many coastal regions worldwide, mangrove forests affect the dynamics and mobility of different elements to the oceans especially through their soils. The biogeochemistry of mangrove soils responds to numerous factors that vary within different spatial and time scales. In this sense, seasonality can be crucial in determining the role of these ecosystems towards the iron biogeochemical cycle. Thus, the main goal of the present study was to assess the effects of contrasting climatic conditions on iron biogeochemistry in different mangrove forests along the Brazilian coast. We studied the soils (n = 435) of 14 different mangrove forests distributed along two contrasting climate regions: the semi-arid Northeast and the humid Southeast coasts of Brazil. In the SE region, water surplus and lower temperatures in both seasons did not cause significant changes in iron concentrations (wet season: 216 lmol g -1 ; dry season: 230 lmol g -1 ) where oxyhydroxides and pyrite immobilize iron in the mangrove soils. In contrast, in the semi-arid mangroves, a marked water deficit during the dry season caused both pyrite oxidation and iron reprecipitation as oxyhydroxides. Contrarily,

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“…Iron (hydr)oxides are ubiquitous in Earth’s surface environment. They are derived from the weathering of magmatic rock and Fe-bearing minerals and can be transported via rivers and the atmosphere from the land to the ocean. − In Earth’s history, the formation of abundant iron (hydr)oxides occurred in the Great Oxidation Event (∼2.4 Ga ago), during which massive dissolved Fe 2+ was oxidized by O 2 produced by photosynthetic cyanobacteria. , Moreover, iron (hydr)oxides formed in the supergene low-temperature environments, including ferrihydrite, lepidocrocite, Schwertmannite, goethite, and hematite, generally exist as micro/nanoparticles and always have large specific surface area and abundant activity sites, thus functioning as important geosorbents. ,− Furthermore, iron (hydr)oxides as typical semiconducting minerals on Earth’s surface can absorb light energy to trigger redox reactions, i.e., transforming solar energy to chemical energy, which can significantly influence the inorganic and organic world (e.g., generating reactive oxygen species (ROS) to influence many biogeochemical cycles). − In this context, iron (hydr)oxides can participate in a wide range of biotic and abiotic processes throughout geological time, contributing to the evolution of Earth system. ,− …”

Section: Introductionmentioning

confidence: 99%

Photoreductive Dissolution of Iron (Hydr)oxides and Its Geochemical Significance

Liu

Zhu

et al. 2022

ACS Earth Space Chem.

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Iron (hydr)oxides are the most abundant metal oxides, which are widespread on Earth’s surface in the major form of micro/nanoparticles. Dissolution of iron (hydr)oxides significantly controls their compositions on Earth’s surface and is a critical step for the global Fe cycling. Photoreductive dissolution of iron (hydr)oxides is recognized as one of the most important process for generating Fe2+ in surface water and is also a common pathway for transforming solar energy into chemical energy. This review article dissects the main characteristics of photoreductive dissolution of iron (hydr)oxides and discusses its geochemical and environmental significance. We categorize the mechanisms for photoreduction of iron (hydr)oxides into three types: reduction by intrinsic photogenerated electrons, reduction by ligand to metal electron transfer (LMCT), and reduction by direct injection of exogenous photoelectrons. The efficiency of photoreductive dissolution is constrained by both the structure of iron (hydr)oxides (e.g., crystal structure and particle size) and environmental conditions (e.g., light, pH, and concurrent chemicals). Therefore, different iron (hydr)oxides may exhibit quite distinctive photoreductive dissolution characteristics because of their unique crystal structures and physicochemical properties. Iron (hydr)oxides with low crystallinity (e.g., ferrihydrite, lepidocrocite) are subject to direct photoreductive dissolution, while those with high crystallinity (e.g., goethite, hematite) generally need ligands to proceed with photoreductive dissolution. The photoreductive dissolution of iron (hydr)oxides is involved in many important geochemical and environmental processes, such as the Fe availability to primary producers, the generation of reactive oxygen species, the transportation and fate of contaminants, and the phase transformation of iron (hydr)oxides. Given the ubiquitous occurrence of photoreductive dissolution of iron (hydr)oxides, this review will advance our understanding of the role of this process in Earth’s surface environments.

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Biogeochemical cycling of iron (hydr-)oxides and its impact on organic carbon turnover in coastal wetlands: A global synthesis and perspective

Cited by 74 publications

References 187 publications

Storage, patterns and influencing factors for soil organic carbon in coastal wetlands of China

Storage, patterns and influencing factors for soil organic carbon in coastal wetlands of China

Windsock behavior: climatic control on iron biogeochemistry in tropical mangroves

Photoreductive Dissolution of Iron (Hydr)oxides and Its Geochemical Significance

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