Distribution of iron oxides forms on a transect of calcareous soils, north-west of Iran

Rezapour, Salar; Jafarzadeh, A A; Samadi, Abbas; Oustan, Shahin

doi:10.1080/03650340902956660

Cited by 11 publications

(1 citation statement)

References 31 publications

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“…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). In the study, the contents of Fe o in SPA and SA were significantly higher than those in the other vegetation types (Figure 3C), which corresponded to higher values of TOC and DOC in the sites.…”

Section: Discussionmentioning

confidence: 53%

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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Section: Discussionmentioning

confidence: 53%

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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The impacts of long-term intensive agriculture on the Vertisol properties in a calcareous region

Rezapour

Najari

Ghaemian

2015

Environ Monit Assess

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Morphological, physicochemical, and mineralogical properties of Vertisols (Chromic Calcixererts, Typic Haploxererts, and Typic Calcixererts) influenced under farming practices and adjoining uncultivated soils were investigated in order to contribute to the understanding of changes derived by intensive cultivation (over five decades). The study revealed that A-horizon thickness enhanced from 20 cm in the uncultivated soil to 30 cm in the cultivated soil for Typic Haploxererts and Typic Calcixererts. Under cropping, calcium carbonate contents decreased (a drop of 10 to 53%) reflecting accelerated leaching and/or erosion by cultivation. For most of the studied soils, a pronounced depletion was recorded at values of soil organic carbon (23-64%), soluble cations (4-96%), and exchangeable cations (9-42%) after cropping. A considerable positive change in soil quality was observed with cultivation as recorded by a declining trend in soil electrical conductivity (a drop of 12 to 17%) and exchangeable sodium percentage (a drop of 9 to 12%). On average, the concentration of free and crystalline Fe oxides progressively increased for Chromic Calcixererts and Typic Calcixererts following intensive cultivation. Cropping operations considerably promoted the alteration of illite and chlorite minerals into expandable minerals linked with changes in soil physicochemical properties mainly the increase in cation exchange capacity. Land productivity index (LPI), evaluated based on parametric approach, suggested that Chromic Calcixererts and Typic Haploxererts highlighted a decreasing trend in LPI values (a drop of 5 to 7%) while Typic Calcixererts manifested an increasing pattern in the index (a rise of 13%) with long-term intensive cropping.

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Vertical distribution of magnetic susceptibility as affected by pedoenvironmental factors along an arid and semi-arid transect, Fars Province, Iran

et al. 2021

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Distribution of iron oxides forms on a transect of calcareous soils, north-west of Iran

Cited by 11 publications

References 31 publications

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

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

The impacts of long-term intensive agriculture on the Vertisol properties in a calcareous region

Vertical distribution of magnetic susceptibility as affected by pedoenvironmental factors along an arid and semi-arid transect, Fars Province, Iran

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