Generation and properties of organic colloids extracted by water from the organic horizon of a boreal forest soil

Andersson, Erika; Meklesh, Viktoriia; Gentile, Luigi; Bhattacharya, Abhishek; Stålbrand, Henrik; Tunlid, Anders; Persson, Per; Olsson, Ulf

doi:10.1016/j.geoderma.2023.116386

Cited by 5 publications

(1 citation statement)

References 51 publications

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“…The sieved soil samples were mixed with ultrapure water at a solid-to-liquid ratio of 1:10 (w:v) [23,24]. The mixture was shaken at 220 r•min −1 for 24 h at 25 • C with agitation.…”

Section: Extraction and Analysis Of Dommentioning

confidence: 99%

Combination Mechanism of Soil Dissolved Organic Matter and Cu2+ in Vegetable Fields, Forests and Dry Farmland in Lujiang County

Yao,

Zhang,

et al. 2024

Agriculture

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Dissolved organic matter (DOM) serves as a critical link in the migration and transformation of heavy metals at the soil–solid interface, influencing the migration behaviour and transformation processes of Cu2+ in soil. There have been studies on the combination mechanisms between DOM and Cu2+ in paddy soils. However, the adsorption/complexation and redox processes between DOM and Cu2+ in other agricultural soil types (such as dry farmland and vegetable fields) are unclear. In order to reveal the combination process of DOM with Cu in different agricultural soil types and the dynamic changes in chemical behaviour that occur, this study analysed the variability of DOM components and structure in three soils using three-dimensional fluorescence spectroscopy and X-ray photoelectron spectroscopy. In addition, the priority order of different DOM compounds in combination with Cu and the change process in relation to the Cu valence state in the soil of Lujiang County, Anhui Province, was revealed based on laboratory experiments. The results showed that the composition of soil DOM was mainly composed of humic-like and fulvic-like substances with a clear terrestrial origin and that the organic matter showed a high degree of decomposition characteristics. The results indicated that the composition of soil DOM is mainly composed of humic and fulvic acid-like substances, and they have obvious characteristics of terrestrial origin. In addition, the soil organic matter showed high decomposition characteristics. The complex stability constants (lgKM) of humic acid-like substances with Cu2+ follow the order of forest land (lgKM = 5.21), vegetable land (lgKM = 4.90), and dry farmland (lgKM = 4.88). The lgKM of fulvic acid-like substances with Cu2+ is in the order of dry farmland (lgKM = 4.51) and vegetable land (lgKM = 4.39). Humic acid-like substances in soil DOM combine preferentially with Cu2+, showing a stronger chelating affinity than fulvic acid-like substances. Cu2+ complexes mainly include hydroxyl, phenolic hydroxyl and amino functional groups are included in soil DOM, accompanied by redox reactions. In comparison to dry farmland, the soil DOM in forest and vegetable fields undergoes more intense redox reactions simultaneously with the chelation of Cu2+. Therefore, the application of organic fertilisers to vegetable and forest soils may lead to uncertainties concerning the fate of heavy metals with variable chemical valence. These results contribute to a deeper understanding of the interaction mechanisms between DOM and Cu2+ in agricultural soils.

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“…The sieved soil samples were mixed with ultrapure water at a solid-to-liquid ratio of 1:10 (w:v) [23,24]. The mixture was shaken at 220 r•min −1 for 24 h at 25 • C with agitation.…”

Section: Extraction and Analysis Of Dommentioning

confidence: 99%

Combination Mechanism of Soil Dissolved Organic Matter and Cu2+ in Vegetable Fields, Forests and Dry Farmland in Lujiang County

Yao,

Zhang,

et al. 2024

Agriculture

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Pig manure addition promotes organic carbon sequestration dominantly contributed by mineral protection in upland red soil

Jia,

Li,

et al. 2024

Land Degrad Dev

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Organic fertilizers are essential for enhancing soil organic carbon (SOC) levels and promoting sustainable agriculture. The mechanisms of carbon sequestration in upland red soils using various organic materials are not well understood. Here, the impact of various organic fertilization strategies on SOC fractions, functional groups, iron oxides, and soil aggregates was investigated to clarify the protective mechanisms underlying SOC preservation. Six fertilization regimes were examined: no fertilization (CK), mineral fertilizer (CF), 60% mineral fertilizer (RF), RF + straw (RFS), RF + pig manure (RFP), and RF + vermicompost (RFV). The results demonstrated that SOC contents significantly increased by 62.5% in RFP and 63.1% in RFV compared to the CF treatment, with particulate organic carbon (POC) being the primary contributor. Scanning electron microscopy and X‐ray photoelectron spectroscopy demonstrated that RFP and RFV treatments induced the formation of denser flock‐like aggregates and increased aromatic C content, respectively. Fourier transform infrared spectroscopy analysis indicated that RFV treatment exhibited the highest abundance of functional groups among all treatments. SOC and POC were highly positively correlated with soil chemical properties, soil aggregates, poorly crystalline iron oxides, and aromatic rings. Structural equation models indicated that pig manure and vermicompost directly promoted POC accumulation, while straw provided physical protection for POC by enhancing aggregate formation. Furthermore, pig manure indirectly facilitated the development of POC and mineral‐associated organic carbon via soil biochemical properties and iron oxides, respectively. Overall, the application of organic fertilizers enhanced the physical protection, mineral immobilization, and recalcitrance (alkyl C, aromatic C) of organic carbon, facilitating C sequestration and stability. This study highlights the importance of organic management in upland red soils for increasing SOC storage and maintaining global C balance.

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A contrast variation SANS and SAXS study of soil derived dissolved organic matter, and its interactions with hematite nanoparticles

et al. 2023

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Generation and properties of organic colloids extracted by water from the organic horizon of a boreal forest soil

Cited by 5 publications

References 51 publications

Combination Mechanism of Soil Dissolved Organic Matter and Cu2+ in Vegetable Fields, Forests and Dry Farmland in Lujiang County

Combination Mechanism of Soil Dissolved Organic Matter and Cu2+ in Vegetable Fields, Forests and Dry Farmland in Lujiang County

Pig manure addition promotes organic carbon sequestration dominantly contributed by mineral protection in upland red soil

A contrast variation SANS and SAXS study of soil derived dissolved organic matter, and its interactions with hematite nanoparticles

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