Evolution over years of structural characteristics of humic acids in Black Soil as a function of various fertilization treatments

Zhang, Jiuming; An, Tingting; Fengqin, Chi; Wei, Dan; Zhou, Baoku; Hao, Xiaoyu; Liang, Jin; Wang, Jingkuan

doi:10.1007/s11368-018-2212-z

Cited by 21 publications

(15 citation statements)

References 43 publications

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“…The present study showed that the HA-C structure in the humus of black soil included waxy substance, carbohydrates, carboxyl-substituted aromatic C, carboxylic acids, amide C, some peptides, and methoxy C. The ratio of aliphatic C to aromatic C is usually considered as an index of the humification degree of HA structure 29 . The higher percentages of aliphatic C relative to aromatic C in HA in the treatments M and MNPK (Table 2) indicated that long-term organic fertilizers simplified the structure of HA and decreased the aromaticity.…”

Section: Discussionmentioning

confidence: 75%

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Impacts of Long-term Fertilization on the Molecular Structure of Humic Acid and Organic Carbon Content in Soil Aggregates in Black Soil

Zhang

Fengqin

Wei

et al. 2019

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Soil aggregates are the basic units of soil structure, and their composition and carbon (C) stability directly affect soil fertility. As cementing agents, humic substances play an important role in the formation and stability of soil aggregates. Long-term fertilization not only changes the structure of humic acid (HA), but also affects the content and stability of organic C in soil aggregates. In this study, based on a long-term fertilization experiment, the relationship between the molecular structure of HA and the stability of organic C in the aggregates was examined. Compared with the non-fertilization control (CK), both the application of organic manure alone (M) and organic manure combined with inorganic fertilizer application (MNPK) increased organic C content in the bulk soil and in HA. In addition, the application of organic manure (M, MNPK) favored the formation of macroaggregates (>0.25 mm) and showed a higher organic C contents of soil aggregates with different sizes than the CK. Moreover, the content of aliphatic C, the ratios of aliphatic C/aromatic C and alkyl C/O-alkyl C was increased with the application of organic fertilizer. A significant negative correlation was observed between aromatic C and organic C content of the aggregates with sizes of >2 mm, 2–0.25 mm, and 0.25–0.053 mm ( P < 0.05). The findings indicated that organic fertilization treatments (M and MNPK) increased the aliphatic C content of HA, which favored the increase in the organic C content and stability of the aggregates.

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Section: Discussionmentioning

confidence: 75%

“…The detailed method of HA separation and purification was described by our previous study 29 . Briefly, 100 g air-dried soils and 1 mol L −1 HCl solution were added into a glass bottle at a ratio soil to solution of 1:1.…”

Section: Methodsmentioning

confidence: 99%

Impacts of Long-term Fertilization on the Molecular Structure of Humic Acid and Organic Carbon Content in Soil Aggregates in Black Soil

Zhang

Fengqin

Wei

et al. 2019

Sci Rep

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“…HS (fulvic acids, HAs, and humins) are the main fractions of SOM making its specific contribution to soil fertility. HS constitute a considerable part of the resources of OC and nitrogen (N) (Lal 1994 ; Milori et al 2002 ; Zhang et al 2019 ). Those compounds take part in all the processes which occur in soil and which affect its physical, chemical, and biological properties.…”

Section: Introductionmentioning

confidence: 99%

“…The molecules of HAs, with a humification progress, show a growing stability, e.g., in terms of elemental composition and spectroscopic properties (Dergacheva et al 2012 ; Zhang et al 2019 ). For that reason, one of the basic indicators applied to evaluate the properties of HAs is the elemental composition and, determined with it, values of the H/C, O/C, and N/C atomic ratios.…”

Section: Introductionmentioning

confidence: 99%

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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“…The ratio of alkyl to O-alkyl groups often is indicative of the degree of SOM decomposition, i.e., the degree of decomposition is high when the ratio is high (Leifeld et al 2002 ; Zhao et al 2012 ), while the total alkyl (i.e., the sum of alkyl and O-alkyl groups) to aromatic ratio is used as a sensitive index of the humification degree of SOM, i.e., the humification degree is high when the ratio is low (Zhang et al 2019 ). The humified products are considered more stable with advancing humification degree (Zhao et al 2021 ), which was enriched with aromatic groups and depleted in O-alkyl groups (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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Evolution over years of structural characteristics of humic acids in Black Soil as a function of various fertilization treatments

Cited by 21 publications

References 43 publications

Impacts of Long-term Fertilization on the Molecular Structure of Humic Acid and Organic Carbon Content in Soil Aggregates in Black Soil

Impacts of Long-term Fertilization on the Molecular Structure of Humic Acid and Organic Carbon Content in Soil Aggregates in Black Soil

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

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

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