Changes in the Ratio of Aggregate Fractions in Humus Horizons of Chernozems in Response to the Type of Their Use

Холодов, В. А.; Yaroslavtseva, N. V.; Farkhodov, Yu. R.; Belobrov, V. P.; Yudin, S. A.; Aydiev, A. Ya.; Lazarev, V. I.; Фрид, А. С.

doi:10.1134/s1064229319020066

Cited by 35 publications

(8 citation statements)

References 12 publications

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“…Because of both pyrolysis steps, data matrices contain a compositional data (sum of each row = 100%), each matrix was prepared for principal components analysis (PCA) by the centered logratio transformation to the working matrix clr(x) [20,21,22] according to the equation:clr(x) = [lg{x1 / g(x)},.... lg{xi / g(x)}],where x is the initial data and g(x) their geometric mean.…”

Section: Methodsmentioning

confidence: 99%

Influence of No-Till Practices on the Organic Matter Chemical Composition of Protocalcic, Endocalcic and Pantocalcic Chernozems

Холодов¹,

Farkhodov²,

Yaroslavtseva³

et al. 2021

Preprint

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Reducing the amount of precipitation in summer in the Chernozems area alters soil organic matter (SOM). To compensate for the lack of moisture, farmers are introducing new agricultural technologies such as no-till cultivation. In turn, no-till practices influence the composition of SOM. We examined the impacts of the rise of aridity and no-till technology on the chemical composition of bioavailable and recalcitrant pools of OM. The properties of SOM were assessed using double-shot pyrolysis with gas chromatography/mass spectrometry (GC/MS). The thermolabile substances that are volatilised in the first stage of pyrolysis (300°C) are considered the bioavailable pool. Accordingly, substances are obtained in the second pyrolysis stage (500°C) were attributed to the recalcitrant pool. Identified in both steps of pyrolysis, products were assigned to different chemical groups (lignin-derivative, polysaccharide-fragments, indoles, etc.) and relative abundances were calculated. In work for the separation of substances, a polar column was used for chromatography of the thermolabile fraction. With an increase in aridity in Сhernozems, the content in the bioavailable pool of polysaccharide fragments decreased and the proportion of indoles increased. In the recalcitrant pool, the abundance of six-membered rings with nitrogen and aromatic compounds decreases at the same time the contents of unsubstituted and O-substituted acyclic compounds as well as pyridine increases. The influence of the NT was more noticeable in the recalcitrant OM. The NT practice promotes biological activity and to rich in nitrogen compounds the bioavailable OM; this process contributes to the accumulation of carbon in the recalcitrant OM.

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Section: Methodsmentioning

confidence: 99%

Influence of No-Till Practices on the Organic Matter Chemical Composition of Protocalcic, Endocalcic and Pantocalcic Chernozems

Холодов¹,

Farkhodov²,

Yaroslavtseva³

et al. 2021

Preprint

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“…The initial data matrix could be transformed. One possibility could be the centered log-ratio transformation to the working matrix clr(x) as it was developed by Kholodov et al (2019) according to the equation: clr(x) = [log{x1/g(x)},....log{xi/g (x)}], where x would denote the initial data, and g(x) their geometric mean. Perhaps because the matrix transformation was not carried out our results were based on specific agronomic factors such as BD with one of the smallest variation coefficient.…”

Section: Effect Of Land Use On Sqimentioning

confidence: 99%

Understanding the effect of shifting cultivation practice (slash-burn-cultivation-abandonment) on soil physicochemical properties in the North-eastern Himalayan region

Mishra

Giri

Jangir

et al. 2021

Ingeo

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Shifting cultivation (jhum cultivation), a common practice of converting forest land into agricultural land by slash and burn is threatening the ecosystem. This study assesses the effect of shifting cultivation cycles on soil quality in the North-eastern Himalayan region using a minimum of soil properties. To achieve this goal, a soil quality index (SQI) approach and multivariate techniques were used for surface (0-30 cm) and subsurface (30-70 cm) layers of soils in the forest, jhum land, and jhum fallow areas. The highest variability among land uses was found for clay content, SOC (soil organic carbon), exchangeable Mg and K, CEC (cation exchange capacity), and the Ca/Mg relationship. On the contrary, the lowest variation was recorded in bulk density (BD), porosity, and pH. The results of the principal component analysis (PCA) show BD, soil texture, available nitrogen (Nav), available phosphorus (Pav), available potassium (Kav), calcium (Ca) and sodium (Na) as the major indicators of soil quality. The study indicated that surface layers of forest soils have a lower soil quality when compared to jhum lands. Although jhum lands show a better soil quality compared to forests, their continued cultivation without any fertilisation and subsequent depletion of the soil nutrients can cause a degradation of soil quality as observed in jhum fallow lands. The use of these selected indicators for soil quality assessment was useful in terms of saving time and costs.

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“…There is an increasing need to study and monitor soils as the largest solid carbon reservoir, identifying soil condition changes, including soil formation, degradation, remediation, environmental protection, and ecosystem integrity. Apart from bulk soil properties, studies on the roles of agricultural use and anthropogenesis on physical and physicochemical properties of soils become more topical. − A new and demanding challenge is characterizing the composition and structures of soil fractions, including changes at microaggregate levels. − The behavior of macroaggregates has been studied actively for a long time, − but the properties of microaggregates have been studied much less . The critical problem of soil analysis is the characterization of soil organic matter (SOM) as an organomineral continuum of high- and low-molecular organic and inorganic substances in a finely dispersed state. , …”

Section: Introductionmentioning

confidence: 99%

FTIR Photoacoustic and ATR Spectroscopies of Soils with Aggregate Size Fractionation by Dry Sieving

et al. 2022

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Granulometric fractionation as a source of additional information on organic-matter and inorganic matrix components of soils using FTIR–photoacoustic spectroscopy (FTIR–PAS) supported by attenuated–total reflection FTIR spectroscopy (ATR–FTIR) for a wide range of aggregate fractions (10–5000 μm) was used to compare the sensitivity, reproducibility, information contents, and representativity of fractionated samples. For chernozem and sod-podzolic soils and different agricultural-use chernozem samples, differences in the composition were found, manifested in normalized spectra of microaggregate fractions, with the range of 10–100 μm bearing the complete information. Most changes are observed in the soil organic matter range (1900–1340 cm–1), although these changes are slight, and in the soil-matrix region (550–300 cm–1). The latter region increases the intensity of bands corresponding to amorphous silica and clay minerals in fine fractions, while the intensity of bands attributed to quartz lattice vibrations decreases. FTIR–PAS spectra do not differ considerably at high interferometer modulation frequencies as the signal-penetration depth is comparable with particle sizes. The soil fractions below 20 μm result in the maximum sensitivity, reproducibility, and signal-to-noise ratio, showing no changes from coarser fractions by the information content and, thus, providing representative samples for analysis. The fractionation shows more differences in the sod-podzolic and chernozem soil fractions than the whole soil spectra. FTIR–PAS provides better sensitivity and reproducibility in the 4000–2000 cm–1 region and ATR–FTIR in the 2000–100 cm–1 region.

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Changes in the Ratio of Aggregate Fractions in Humus Horizons of Chernozems in Response to the Type of Their Use

Cited by 35 publications

References 12 publications

Influence of No-Till Practices on the Organic Matter Chemical Composition of Protocalcic, Endocalcic and Pantocalcic Chernozems

Influence of No-Till Practices on the Organic Matter Chemical Composition of Protocalcic, Endocalcic and Pantocalcic Chernozems

Understanding the effect of shifting cultivation practice (slash-burn-cultivation-abandonment) on soil physicochemical properties in the North-eastern Himalayan region

FTIR Photoacoustic and ATR Spectroscopies of Soils with Aggregate Size Fractionation by Dry Sieving

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