Features of the chemical structure of different organic matter pools in Haplic Chernozem of the Streletskaya steppe: 13C MAS NMR study

Данченко, Н. Н.; Artemyeva, Z. S.; Kolyagin, Yu. G.; Когут, Б. М.

doi:10.1016/j.envres.2020.110205

Cited by 15 publications

(5 citation statements)

References 53 publications

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“…The maximum signal level was recorded in the zone of the C,H-alkyls, which indicates the formation of a branched net of simple carbon bonds ((CH 2 )n/CH/C and CH 3 ). The character of the soil spectrum is comparable to the previously studied Chernozem Haplic in the European part of Russia (Trubetskoi & Trubetskaya 2011;Danchenko et al 2020). The predominance (up to 59%) of the aromatic structural fragments (ARSF) was noted in the sediments.…”

Section: Chernozem Haplic Endosalicsupporting

confidence: 74%

Biophysicochemical properties of the eroded southern chernozem (Trans-Ural Steppe, Russia) with emphasis on the <sup>13</sup>C NMR spectroscopy of humic acids

Suleymanov¹,

Polyakov²,

Komissarov³

et al. 2022

Soil & Water Res.

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The morphological, water-physical and chemical properties, basal respiration of the southern chernozem (Chernozem Haplic Endosalic) and erosional sediment in the Trans-Ural steppe zone (Republic of Bashkortostan, Russia) were studied. The surface soil horizon significantly differs from the sediment by the better structure and water aggregate stability. The particle size distribution of the sediments, due to erosion, contains more silt and clay fractions compared to the slope soil. It indicates a great potential for the carbon saturation of the soil which is limited by degradation. The slope soil is slightly saline, the type of the salinisation is sulfate with the participation of hydrocarbonates. The СО2 emissions, the organic carbon and alkaline-hydrolysable nitrogen content is low; and significantly lower than in the erosional sediment, but the content of exchangeable cations and water-soluble salts is higher. The structural composition of the humic acid (HA) extracted from the soil and erosional sediments was determined by 13C NMR spectroscopy. Aliphatic structural fragments predominate (65%) with a maximum signal level in the area of C, H-alkyls in the HA of the surface horizon. In the HA of the erosional sediment, the proportion of aromatic structural fragments is higher (up to 59%), which is associated with the processes of hydrolysis and condensation. In the HA of the slope soil, the formation of predominantly C, H-alkyls, oxygen-containing groups, including carboxyl ones, takes place. Differences in the composition of the structural fragments and functional groups of the soil and sediment HA are due to the different stability of the organic matter under conditions of the development of the soil erosion processes.

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Section: Chernozem Haplic Endosalicsupporting

confidence: 74%

Biophysicochemical properties of the eroded southern chernozem (Trans-Ural Steppe, Russia) with emphasis on the <sup>13</sup>C NMR spectroscopy of humic acids

Suleymanov¹,

Polyakov²,

Komissarov³

et al. 2022

Soil & Water Res.

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“…The temporal period of each management on each C functional group and the A/O and A/Aroma ratios by fertilizations were not significantly different (see Table S 2 in the supplemental material); therefore, all data were used for further analysis. Although some recent studies showed that SOM fractions such as humic acids could be a good soil quality indicator representing SOM (e.g., Audette et al 2021 ; Danchenko et al 2020 ; Novotny et al 2020 ; Savarese et al 2021 ), significant differences between soil samples and SOM fractions were observed for alkyl groups and the ratio of A/O (see Table S 3 in the supplemental materials); therefore, only the data from the studies that analyzed bulk soil samples (i.e., 227 pairwise data from 10 studies) were used for the further analysis.…”

Section: Fertilizationmentioning

confidence: 99%

“…Although NMR spectra do not provide the structural organization of SOC at the molecular level and therefore is prone to losing details (Danchenko et al 2020;Novotny et al 2020) and often the region of these chemical shifts are not completely exclusive (Stevenson 1994), it still gives approximate distribution of C functional groups (Danchenko et al 2020). By comparing in spectral regions, the degree of decomposition/humification of SOM in soils or the effects of different agricultural management practices on the distribution of C functional groups (Danchenko et al 2020) could be determined with the solid-state 13 C NMR spectroscopy (Helfrich et al 2006;Rodriguez et al 2021).…”

Section: Introductionmentioning

confidence: 99%

The effect of agroecosystem management on the distribution of C functional groups in soil organic matter: A review

et al. 2021

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To improve soil health and to aid in climate change mitigation, the quantity of soil organic matter (SOM) should be maintained or increased over the long run. In doing so, not only the total quantity of SOC but also the stability of SOC must be considered. Stability of SOC increases as a function of resistance to microbial decomposition or microbial substrate use efficiency through chemical, biological, and physical mechanisms including humification, hydrophobic moieties, molecular diversity, and formation of macroaggregates. One of the mechanisms that enhance stability confers changes in the distribution of C functional groups of SOM. To better understand and quantify how these changes are influenced by agricultural management practices, we collected 670 pairwise data from the body of literature that has evaluated changes in the distribution of C functional groups of SOM measured by solid-state 13C NMR spectroscopy. The types of agricultural managements discussed herein include (1) fertilization, (2) tillage, (3) crop rotation, (4) grazing, and (5) liming practices. Our meta-analyses show that these practices modify the distribution of C functional groups of SOM. Fertilization practices were associated with increased O-alkyl groups. Tillage resulted in increases in the SOC consisted of aromatic and carbonyl groups. Crop rotations, especially legume-based rotations, were found to increase the proportion of aromatic groups. Although there are fewer publications on tillage and crop rotation than on fertilization practices, the distribution of C functional groups may be more influenced by crop rotation and tillage practices than fertilization management—and should be a focus of future research.

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“…For the LTBF WEOM, a 254 and SUVA 254 almost monotonically decreased as salinity increased (from 25 to 19 and from 2.2 to 1.55, respectively), while no signi cant changes were noticed for the steppe WEOM. The different behavior seems to be due to the fact that LTBF soil OM is more mature and hydrophobic, enriched with aromatic structures (Danchenko et al 2020(Danchenko et al , 2022, and depleted of products of microbial origin (Zhelezova et al 2017). This evidenced by the wider C/N ratio of this sample.…”

Section: Absorption Spectra and Spectral Indexesmentioning

confidence: 99%

Direct Salinity Effect on Absorbance and Flourescence of Chernozem Water-Extractable Organic Matter

Холодов

Данченко

Ziganshina

et al. 2023

Preprint

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Soil-derived dissolved organic matter (DOM) has a significant impact on aquatic ecosystems. Identifying the fluorescence signatures of DOM from different soils in river and sea waters can provide valuable insights into its migration patterns. This makes crucial the assessment of pH, salinity, and other parameters contribution to the variability of DOM fluorescence. Present study investigates the changes of DOM of typical Chernozems under varying salinity using UV-visible absorbance and excitation–emission matrices of fluorescence spectroscopy coupled with parallel factor analysis (EEMs-PARAFAC). Water-extractable organic matter (WEOM) as a proxy for DOM was isolated from soils of two field experiment plots with contrasting land uses: long-term bare fallow (LTBF) and annually mowed steppe (Steppe). The extracts were incubated in the dark with varying NaCl concentrations and examined. Steppe WEOM exhibited high structural and aggregation resistance to salinity changes, while significant changes in optical parameters and loads of PARAFAC components were observed for LTBF WEOM. The remarkable stability of the Steppe WEOM can be attributed to its chemical diversity. Two distinct and sufficiently stable humic-like PARAFAC components have the potential to serve as markers of Chernozem DOM. The findings contribute to the limited existing knowledge on the direct influence of salinity on the transformation of specific soil types DOM.

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Features of the chemical structure of different organic matter pools in Haplic Chernozem of the Streletskaya steppe: 13C MAS NMR study

Cited by 15 publications

References 53 publications

Biophysicochemical properties of the eroded southern chernozem (Trans-Ural Steppe, Russia) with emphasis on the <sup>13</sup>C NMR spectroscopy of humic acids

Biophysicochemical properties of the eroded southern chernozem (Trans-Ural Steppe, Russia) with emphasis on the <sup>13</sup>C NMR spectroscopy of humic acids

The effect of agroecosystem management on the distribution of C functional groups in soil organic matter: A review

Direct Salinity Effect on Absorbance and Flourescence of Chernozem Water-Extractable Organic Matter

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