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

Zhang, Jiuming; Fengqin, Chi; Wei, Dan; Zhou, Baoku; Cai, Shanshan; Li, Yán; Kuang, Enjun; Sun, Liqin; Li, Lujun

doi:10.1038/s41598-019-48406-8

Cited by 29 publications

(17 citation statements)

References 25 publications

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“…The results showed that an absorbance peak at 1217,1370, 1741 cm -1 for cellulose and the 1258, 1365, 1737cm -1 for nanocellulose was observed. Both cellulose and nanocellulose absorbance peaks at 1217 and 1216cm Similar result was obtained by [14,15] reported that the absorbance peak at 1050 cm -1 is due to C-O Stretching, the peaks at 1730,1720 cm -1 are assigned to the C=O stretching indicates the microcrystalline cellulose. [16] also reports the C-O stretching to confirm the presence of cellulose.…”

Section: Fourier Transform Infrared Spectrometer (Ftir)supporting

confidence: 81%

Synthesis and Characterization of a Novel Maize Cob Based Nanocellulose

Cheran

Rahale²,

Lakshmanan³

et al. 2022

IJPSS

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Nanocellulose is a renewable nanomaterial that has received a lot of attention due to its use in a variety of applications from the biomedical field to food packaging. In this study, Nano cellulose (NC) was extracted from Maize cob, using the Acid hydrolysis process. The extracted NC was characterized using Particle Size Analyzer (PSA) for particle size, Fourier Transform Infrared Spectroscopy (FT-IR) for functional groups, Scanning Electron Microscope (SEM), and Transmission Electron Microscope (TEM) for getting the morphology of NC and X-Ray Diffraction (XRD) for crystallinity analysis. The result showed that, the synthesized NC with a particle size of 213.5nm and zeta potential of -34.5mV. The FT-IR analysis showed that the functional groups stretched at C-O, C=O, and S=O with a wavenumber of 1216cm-1, and 1737cm-1,1365cm-1 in NC. XRD analysis shows a peak around 2θ = 15.80, 22.03, 26.69, 40.44 which shows the structure of cellulose. SEM and TEM images of the extraction process of NC show the morphological and structural information of cellulose and Nanocellulose.

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Section: Fourier Transform Infrared Spectrometer (Ftir)supporting

confidence: 81%

Synthesis and Characterization of a Novel Maize Cob Based Nanocellulose

Cheran

Rahale²,

Lakshmanan³

et al. 2022

IJPSS

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“…The ratio of aliphatic C/aromatic C can reflect the complexity of the molecular structure of humic substances. A higher ratio indicates a lower content of aromatic core structures in humic substances, more aliphatic side chains, a lower degree of condensation, and a simpler molecular structure 8 . The results of this study demonstrated that the ratio of aliphatic C/aromatic C of the soil organic carbon in the full rotary tillage return treatment was higher than in the other treatments.…”

Section: Discussionmentioning

confidence: 99%

Response of the chemical structure of soil organic carbon to modes of maize straw return

Zheng

Zhang

Fengqin

et al. 2021

Sci Rep

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Elucidating the chemical structure of soil organic matter (SOM) is important for accurately evaluating the stability and function of SOM. Aboveground vegetation directly affects the quantity and quality of exogenous organic matter input into the soil through plant residues and root exudates, which in turn affects soil microbial species, community structure, and activity, and ultimately impacts the chemical structure of SOM. In this study, a 13C nuclear magnetic resonance technique was used to analyze the chemical structure characteristics of soil organic carbon (SOC) under various rates of straw returning combined with rotary tillage and under full straw mulching. The results showed that full straw returning with rotary tillage and full straw mulching more effectively increased the SOC content than reduced rate of straw returning (1/2 and 1/3 of full straw) with rotary tillage. The contents of alkyl C and alkoxy C in the functional groups of SOC under various straw returning treatments were increased compared with those under the treatment of maize stubble remaining in soil (CK). Furthermore, the contents of aromatic C and carboxyl C were decreased, which were consistent with the chemical shift changes of SOC. Compared with CK treatment, straw returning decreased the content of aromatic C in the functional groups of SOC, but increased the content of alkoxy C, which could be associated with the change in integral areas of absorption peaks of alkyl C and alkoxy C moving toward left and right, respectively. The content of total SOC was significantly positively (P < 0.05) correlated with that of alkoxy C and significantly negatively (P < 0.01) correlated with that of aromatic C. The molecular structure of SOC tends to be simplified due to the decreasing in refractory C and the increasing in easily decomposed C after straw returning to the field.

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“…Soil HMC accounts for the largest proportion of SOC (Dou et al, 2020). Traditional organic materials have the capacity to improve the formation of soil humic substances (Yang et al, 2019;Jiuming Zhang et al, 2019). Biochar as a kind of organic amendment has received little attention in previous studies.…”

Section: Effects Of Straw and Straw-derived Biochar On Soil Organic C...mentioning

confidence: 99%

Long-Term Effects of Straw and Straw-Derived Biochar on Humic Substances and Aggregate-Associated Humic Substances in Brown Earth Soil

Sun

Yang

Meng

et al. 2022

Front. Environ. Sci.

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Turning maize straw into biochar is useful for improving soil fertility and mitigating climate change. However, the difference between straw and straw-derived biochar on soil aggregate associated humic substances has not been sufficiently studied in brown earth soil. The objective of this study was to investigate how different straw management practices affect soil humic substances and aggregate-associated humic substances in the field. As such, an eight-year study (2013–2020) was conducted on brown earth in Northeast China. Three treatments were applied: 1) CK, in which only chemical fertilizer was applied every year; 2) BC, in which biochar was applied at a rate of 2.625 t ha−1 (the same rate of chemical fertilizer as that in the CK was applied); 3) SR, in which straw was returned at a rate of 7.5 t ha−1 (the same rate of chemical fertilizer as that in the CK was applied). Both biochar and straw improved soil aggregate stability that reflected by the mean weight diameter (MWD) and geometric mean diameter (GMD). Compared to the CK treatment, the BC treatment enhanced humic carbon (HMC) both in bulk soil and different aggregate fractions. Biochar decreased the humic acid carbon (HAC) in bulk soil compared to the initial content, but no differences were observed between BC and CK after the eight-year field experiment. All of the aggregate-associated HAC contents were significantly enhanced in response to BC treatment. SR was an effective way to improve soil organic carbon (SOC) and humic substances in bulk soil and aggregate fractions. SR had a relatively small effect on the relative proportions of the C functional groups. Solid-state 13C cross-polarization magic-angle-spinning nuclear magnetic resonance (CPMAS-NMR) spectra of bulk soils revealed that biochar increased the proportion of aromatic C. The ratios of alkyl C/O-alkyl C, aromatic C/aliphatic C, and hydrophobic C/hydrophilic C increased in response to the BC treatment compared to the other treatments. Taken together, biochar amendment can enhance soil aggregate stability, aggregate-associated HMC and stability of SOC on the scale of an eight-year field experiment. Biochar could be an effective approach to sequestrate carbon and improve the quality of brown earth soil.

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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

Cited by 29 publications

References 25 publications

Synthesis and Characterization of a Novel Maize Cob Based Nanocellulose

Synthesis and Characterization of a Novel Maize Cob Based Nanocellulose

Response of the chemical structure of soil organic carbon to modes of maize straw return

Long-Term Effects of Straw and Straw-Derived Biochar on Humic Substances and Aggregate-Associated Humic Substances in Brown Earth Soil

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