Quantitative and qualitative characterisation of humic products with spectral parameters

Filcheva, Е.; Hristova, Mariana; Nikolova, Pavlina; Popova, Todorka; Chakalov, K.; Savov, Valentin

doi:10.1007/s11368-018-2021-4

Cited by 15 publications

(8 citation statements)

References 22 publications

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“…The lowest values of absorbance coefficients were found for the HAs of Luvisol irrespective of the land use and for the molecules of the HAs of Chernozem sampled from the agri-ecosystem (Table 4). As reported by, e.g., Kumada (1987), Howard et al (1998), Tinoco et al (2015, and Filcheva et al (2018), lower values of absorbance and higher values of the following coefficients, A 2/4 , A 2/6 , A 4/6 , and ΔlogK, point to a chemical "young age" of HAs. Young humic acids show a lower degree of condensation of aromatic structures and a lower molecular weight, as compared with the HAs with a high degree of humification.…”

Section: Properties Of Humic Acidsmentioning

confidence: 60%

Properties of humic acids depending on the land use in different parts of Slovakia

Banach-Szott

Dębska

Tobiašová

2021

Environ Sci Pollut Res

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Many studies report organic carbon stabilization by clay minerals, but the effects of land use and soil type on the properties of humic acids (HAs) are missing. The aim of the paper is to determine the effects of land use and soil types on the characteristics of HAs, which have a considerable influence on organic matter quality. It was hypothesised that the effect of the land use on HAs properties depends on the particular size distribution. The research was performed in three ecosystems: agricultural, forest, and meadow, located in Slovakia. From each of them, the samples of 4 soil types were taken: Chernozem, Luvisol, Planosol, and Cambisol. The soil samples were assayed for the content of total organic carbon (TOC) and the particle size distribution. HAs were extracted with the Schnitzer method and analysed for the elemental composition, spectrometric parameters in the UV-VIS range, and hydrophilic and hydrophobic properties, and the infrared spectra were produced. The research results have shown that the properties of HAs can be modified by the land use and the scope and that the direction of changes depends on the soil type. The HAs of Chernozem and Luvisol in the agri-ecosystem were identified with a higher “degree of maturity”, as reflected by atomic ratios (H/C, O/C, O/H), absorbance coefficients, and the FT-IR spectra, as compared with the HAs of the meadow and forest ecosystem. However, as for the HAs of Cambisol, a higher “degree of maturity” was demonstrated for the meadow ecosystem, as compared with the HAs of the agri- and forest ecosystem. The present research has clearly identified that the content of clay is the factor determining the HAs properties. Soils with a higher content of the clay fraction contain HAs with a higher “degree of maturity”.

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Section: Properties Of Humic Acidsmentioning

confidence: 60%

Properties of humic acids depending on the land use in different parts of Slovakia

Banach-Szott

Dębska

Tobiašová

2021

Environ Sci Pollut Res

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“…With the analysis of variance, it was demonstrated that the values of parameter A 4/6 and ∆logK for HAs molecules of the soils sampled from the depth of 0-10 cm were significantly higher than for the molecules of HAs of the soils sampled from the 10-20 cm layer (p = 0.015 and p = 0.024) as well as the HAs molecules of the soils sampled from the layer of 20-30 cm (p = 0.0002 and p = 0.0001) (Table 2). Drawing on literature reports [85,86], it was found that the humic acids of the soils of the layer 0-10 cm revealed a lower degree of humification as compared with the humic acids of deeper horizons. The distance factor had a significant effect on the value of spectrophotometric parameters of the HAs molecules in the soils sampled in Cegielnia and in Kamionna (Table 5).…”

Section: Spectrometric Parameters Of Humic Acids In the Uv-vis Rangementioning

confidence: 92%

Properties of Humic Acids in Meadow Soils Irrigated with the Slope-and-Flooding System

2021

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The still-advancing soil degradation and the related losses of soil organic carbon stocks due to the limited inflow of organic residues in agro-ecosystems encourage more and more soil protection. Establishing meadow ecosystems is one of the key methods of agricultural land use preventing losses of organic carbon in soils. Based on the research on the properties of humic acids, it is possible to determine the advancement of the processes of transformation and decomposition of soil organic matter. The obtained results may allow for the development of a soil protection strategy and more effective sequestration of organic carbon. Therefore, the aim of the research was to determine the properties of humic acids defining the quality of organic matter of meadow soils irrigated for 150 years with the slope-and-flooding system. The research was performed based on the soils (Albic Brunic Arenosol) sampled from Europe’s unique complex of permanent irrigated grasslands (the same irrigation management for 150 years), applying the slope-and-flooding system: the Czerskie Meadows. The soil samples were assayed for the content of total organic carbon (TOC) and the particle size distribution. HAs were extracted with the Schnitzer method and analysed for the elemental composition, spectrometric parameters in the UV-VIS (ultraviolet-visible) range, hydrophilic and hydrophobic properties and the infrared spectra. The research results showed that the HAs properties depend on the depth and the distance from the irrigation ditch. The HAs of soils sampled from the depth of 0–10 cm were identified with a lower “degree of maturity” as compared with the HAs of soils sampled from the depth of 20–30 cm, reflected by the values of atomic ratios (H/C, O/C, O/H), absorbance coefficients, and the FT-IR (Fourier transform infrared) spectra. The mean values of the H/C ratio in the HAs molecules of soils sampled from the depth of 20–30 cm were lower by 8.2% than those from the depth of 0–10 cm. The mean values of the absorbance coefficient A4/6 in the HAs molecules of soils sampled from the depth of 20–30 cm were lower by 9.6% than in the HAs molecules of soils sampled from the depth of 0–10 cm. The HAs molecules of the soils sampled 25 m from the irrigation ditch were identified with a higher degree of humification, as compared with the HAs of the soils sampled 5 m from the irrigation ditch. The results identified that humic acids produced in the many-year irrigated sandy soils were identified with a high degree of humification, which proves the relative stability of the soil’s organic matter. It confirms the importance of meadow soils for the carbon sequestration process. It should also be emphasized that the research area is interesting, although hardly described in terms of organic matter properties. Further and more detailed applicable research is planned, e.g., monitoring of total organic carbon content and comparing the properties of irrigated and non-irrigated meadow soils. Continuity of research is necessary to assess the direction of the soil organic matter transformation in such a unique ecosystem. The obtained results may allow for the development of, inter alia, models of agricultural practices that increase carbon sequestration in soils. In the long term, this will allow for greater environmental benefits and, thus, also increased financial benefits.

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“…The HAs molecules were identified with a decrease in the values of A 2/4 , A 2/6 , A 4/6 , ΔlogK with depth (Table 4). Drawing on literature reports 54,55 , it was found that the humic acids of the A horizons revealed a lower degree of humification, as compared with the humic acids of deeper horizons. The distance factor had a significant effect on the spectrophotometric parameters of the HAs molecules of the soils sampled in Cegielnia and in Kamionna.…”

Section: Spectrometric Parameters Of Humic Acids In the Uv-vis Rangementioning

confidence: 93%

Properties of Humic Acids in Meadow Soils Irrigated With the Slope-And Flooding System

Banach-Szott¹,

Dziamski²

2021

Preprint

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The aim of the research has been to determine the effect of many-year irrigation of unique grasslands on the properties of humic acids defining the quality of organic matter. The research was performed based on the soil (Albic Brunic Arenosol, the A, AE and Bsv horizons) sampled from Europe’s unique complex of permanent grasslands irrigated continuously for 150 years, applying the slope-and-flooding system; the Czerskie Meadows. The soil samples were assayed for the content of total organic carbon (TOC) and the particle size distribution. HAs were extracted with the Schnitzer method and analysed for the elemental composition, spectrometric parameters in the UV-VIS range, hydrophilic and hydrophobic properties and the infrared spectra were produced. The research results have shown that the HAs properties depended on the depth and the distance from the irrigation ditch. The HAs of the A horizon of the soils were identified with a lower “degree of maturity”, as reflected by the values of atomic ratios (H/C, O/C, O/H), absorbance coefficients, and the FT-IR spectra, as compared with the HAs of the Bsv horizon. The HAs molecules of the soils sampled furthest from the irrigation ditch were identified with a higher degree of humification, as compared with the HAs of the soils sampled within the closest distance. The results have demonstrated that many-year grassland irrigation affected the structure and the properties of humic acids.

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Quantitative and qualitative characterisation of humic products with spectral parameters

Cited by 15 publications

References 22 publications

Properties of humic acids depending on the land use in different parts of Slovakia

Properties of humic acids depending on the land use in different parts of Slovakia

Properties of Humic Acids in Meadow Soils Irrigated with the Slope-and-Flooding System

Properties of Humic Acids in Meadow Soils Irrigated With the Slope-And Flooding System

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