Iron-bound carbon increases along a freshwater−oligohaline gradient in a subtropical tidal wetland

Bai, Jing; Luo, Min; Yang, Yang; Xiao, Shuyao; Zhai, Zhifeng; Huang, Jiafang

doi:10.1016/j.soilbio.2020.108128

Cited by 39 publications

(18 citation statements)

References 69 publications

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“…This meta‐analysis found that salinization reduced Hy‐C EEAs but increased Ox‐C EEAs in tidal wetlands (Figure 2a). Our results were in line with several recent studies that found soil EEAs responses to salinity varied between Hy‐C and Ox‐C EEAs (Bai et al., 2021; Dang et al., 2019; Morrissey, Gillespie, et al., 2014). Why did salinization stimulate a shift from Hy‐C EEAs to Ox‐C EEAs?…”

Section: Discussionsupporting

confidence: 93%

“…In addition, salinization may shift microbial community composition and alter microbial physiology, which can cause changes in microbial production of extracellular enzymes (Luo et al., 2019; Morrissey, Berrier, et al., 2014; Morrissey, Gillespie, et al., 2014). Research has shown that soil EEAs have been increased, suppressed, or unaffected in tidal wetlands by salinization (Bai et al., 2021; Chambers et al., 2013; Dang et al., 2019; Li et al., 2019; Morrissey & Franklin, 2015; Morrissey, Gillespie, et al., 2014). Such a wide range of varied effects of salinization on EEAs limits our mechanistic understanding of the effects of salinization on soil C cycling.…”

Section: Introductionmentioning

confidence: 99%

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Differential Responses of Soil Extracellular Enzyme Activities to Salinization: Implications for Soil Carbon Cycling in Tidal Wetlands

Yang

Moorhead

Craig

et al. 2022

Global Biogeochemical Cycles

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Rising sea levels are expected to cause salinization in many historically low‐salinity tidal wetlands. However, the response of soil extracellular enzyme activities to salinization in tidal wetlands and their links to soil organic carbon (SOC) decomposition are largely unknown. Here, we conducted a global meta‐analysis to examine the effect of salinization on hydrolytic and oxidative carbon‐acquiring enzyme activities and their relationships with SOC storage in tidal wetlands. The results showed that salinization reduced hydrolytic carbon‐acquiring enzyme activities by 33% but increased oxidative carbon‐acquiring enzyme activities by 15%. Meanwhile, salinization decreased SOC storage by 14%, and the change in SOC storage was negatively associated with oxidative carbon‐acquiring enzyme activities. These results indicate an important role for oxidative carbon‐acquiring enzymes in SOC loss in tidal wetlands. Moreover, the effect of salinization on oxidative carbon‐acquiring enzyme activities logarithmically declined with increasing salinization, implying that SOC loss was highly sensitive to even minor increases in salinity at the initial stage of salinization. Given increasing salinization over time with rising sea levels in most global tidal wetlands, our results suggest that SOC loss might be greater during early than later stages. Consequently, salinization‐induced SOC loss may be overstated in the long term if extrapolations are merely based on a constant SOC loss rate determined from short‐term studies. Future modeling frameworks should account for this changing sensitivity of microbially mediated SOC loss with increasing salinization over time.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Differential Responses of Soil Extracellular Enzyme Activities to Salinization: Implications for Soil Carbon Cycling in Tidal Wetlands

Yang

Moorhead

Craig

et al. 2022

Global Biogeochemical Cycles

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“…In the present study, total iron and its oxides in soil were positively correlated with TOC and DOC (Figure 5), which is consistent to the results reported by some studies in the estuarine wetlands and paddy field (Wang et al, 2012;Sun et al, 2013;Huang et al, 2020). Previous studies have shown that iron oxides can promote the retention of organic carbon in soil through adsorption, chelation or co-precipitation (Duan et al, 2020;Bai et al, 2021). Weak crystalline and amorphous iron oxides have strong adsorption capacity for organic matter, consequently composing stable organic metal complexes (Rezapour et al, 2010).…”

Section: Discussionsupporting

confidence: 92%

“…We found that the contents of soil clay in the Yellow River Estuary wetland ranged from 4.14 to 25.33% (Table 1), which were positively correlated with Fe T , Fe d and Fe p (Figure 5). Clay minerals can be wrapped by Fe/Al oxides to form stable aggregate structure to improve water retention capacity and physical quality of soil (AL-Shamare and Essa, 2021; Bai et al, 2021;Mendes et al, 2022). Moreover, clay minerals can also be combined with soil organic matter to form organic-inorganic complex, leading to a stronger immobility of iron (Zhang et al, 2001;Angst et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Spatial distribution of soil iron across different plant communities along a hydrological gradient in the Yellow River Estuary wetland

Sun

Qin

et al. 2022

Front. Ecol. Evol.

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Iron is an important element and its biogeochemical processes are vital to the matter and energy cycles of wetland ecosystems. Hydrology greatly controls characteristics of soil property and plant community in wetlands, which can regulate the behavior of iron and its oxides. However, it remains unclear how the spatial distribution of iron and its forms in estuarine wetlands responses to hydrological conditions. Five typical plant communities along a naturally hydrological gradient in the Yellow River Estuary wetland, including Phragmites australis in freshwater marsh (FPA), Phragmites australis in salt marsh (SPA), Tamarix chinensis in salt marsh (TC), Suaeda salsa in salt marsh (SS) and Spartina alterniflora in salt marsh (SA), as sites to collect soil samples. The total iron (FeT) and three iron oxides (complexed iron, Fep; amorphous iron, Feo; free iron, Fed) in samples were determined to clarify the spatial distribution of iron and explore its impact factors. The mean contents of FeT, Fep, Feo and Fed were 28079.4, 152.0, 617.2 and 8285.3 mg⋅kg–1 of soil at 0–40 cm depth in the different sites, respectively. The means were significantly different across communities along the hydrological gradient, with the higher values for SA on the upper intertidal zone and for SPA on the lower intertidal zone, respectively. Iron and its forms were positively correlated with the total organic carbon (TOC), dissolved organic carbon (DOC), total nitrogen (TN) and clay, and negatively correlated with electrical conductivity (EC). The indexes of iron oxides (Fep/Fed, Feo/Fed and Fed/FeT) were also different across communities, with a higher value for SA, which were positively correlated with soil water content (WC) and TOC. The results indicate that a variety of plant community and soil property derived from the difference of hydrology might result in a spatial heterogeneity of iron in estuarine wetlands.

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“…Second, rapid oxidation of ferrous iron [Fe(II)] enriched in wetlands (Bhattacharyya et al., 2018; Van Bodegom et al., 2005) at the redox interface can facilitate the formation of highly reactive ferrihydrite and enhance the co‐precipitation of OC (Riedel et al., 2013; Wang, et al., 2017). Fe(III) (hydr)oxides may also be (at least partly) biogenic in wetlands in contrast to uplands (Bai et al., 2021), further facilitating Fe‐OC interaction. Third, acidic wetlands may favor Fe‐OC and Ca‐OC interactions due to complexation of protonated hydroxyl groups with mineral surfaces (Grybos et al., 2009).…”

Section: Introductionmentioning

confidence: 99%

Delineating the Role of Calcium in the Large‐Scale Distribution of Metal‐Bound Organic Carbon in Soils

Wang

Jia

Liu

et al. 2021

Geophysical Research Letters

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Organic carbon (OC) associated with reactive metal oxides, especially noncrystalline ferric iron [Fe(III)] and aluminum (Al) (hydr)oxides, is commonly assessed by the citrate-bicarbonate-dithionite (CBD) method (termed "metal-bound OC" or abbreviated as "OC CBD " hereafter) and estimated to constitute 15%-38% of total OC in sediments and upland soils (Shields et al., 2016;Zhao et al., 2016). However, the relative importance of OC CBD in different land types (e.g., uplands vs. wetlands) and soil depths remains unclear (Mu et al., 2016;Rasmussen et al., 2018;Wan et al., 2019;Zhao et al., 2016), hampering our ability to predict and protect this important OC pool that is vital for the long-term preservation of soil organic carbon (SOC) (Hemingway et al., 2019;Schmidt et al., 2011).While reactive Fe is assumed to play a central role in binding OC, its content has no relationship with the SOC-normalized concentration of OC CBD at regional scales (Mu et al., 2016;Zhao, et al., 2016). Recent evidence suggests that other polyvalent cations and/or mineral phases including manganese (Mn) and silicate (Si) may also be solublized during the CBD treatment and contribute to OC binding (Jugsujinda et al., 1995;Paterson et al., 1993). In particular, calcium (Ca), one of the most abundant polyvalent cations in soils (Rowley et al., 2018), can promote Fe-OC association by forming Fe-OC-Ca ternary co-precipitates (Adhika-

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Iron-bound carbon increases along a freshwater−oligohaline gradient in a subtropical tidal wetland

Cited by 39 publications

References 69 publications

Differential Responses of Soil Extracellular Enzyme Activities to Salinization: Implications for Soil Carbon Cycling in Tidal Wetlands

Differential Responses of Soil Extracellular Enzyme Activities to Salinization: Implications for Soil Carbon Cycling in Tidal Wetlands

Spatial distribution of soil iron across different plant communities along a hydrological gradient in the Yellow River Estuary wetland

Delineating the Role of Calcium in the Large‐Scale Distribution of Metal‐Bound Organic Carbon in Soils

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