The effects of soil sand contents on characteristics of humic acids along soil profiles

Di, Xinyue; Dong, Hongwei; An, Xianjin; Tang, Haiming; Xiao, Baihua

doi:10.1007/s11631-016-0114-6

Cited by 7 publications

(7 citation statements)

References 67 publications

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“…In particular, this was more clearly shown in HA than in FA (Figure 1). Aromaticity and hydrophobicity of humified organic matter play an important role in reinforcing the recalcitrant characteristics against the degradation, and these indicators are considered to be the composting maturity [41,42]. Table 4 shows the aromaticity and hydrophobicity of humified organic carbon (HA and FA) in our study.…”

Section: Statistic Analysismentioning

confidence: 89%

The Efficiency of a Low Dose of Biochar in Enhancing the Aromaticity of Humic-Like Substance Extracted from Poultry Manure Compost

et al. 2019

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Using biochar as a bulking agent in composting is gradually becoming popular for the minimization of nitrogen losses during the process and the improvement in compost quality. While a wide range of different biochar doses is applied, not much clear information was available about the optimum ratio. This study presents the impact of adding a low dose (2% v/v) of slow-pyrolysis oak biochar (Quercus serrate Murray), into poultry manure on the recalcitrant characteristic of humified organic matter. The influence in the chemical composition of humic-like substance was evaluated in poultry manure compost prepared with (PM+B) and without biochar (PM). The shift to slightly more stable chemical composition was shown in humic acid-like (HA) and fulvic acid-like (FA) extracted from PM+B compost, by increasing the proportion of aromatic carbon groups and thermal stability measured by thermogravimetry. We conclude that the addition of 2% biochar moderately enhances the recalcitrance of humified organic carbon and this could be feasible for the implementation of the biochar use in composting since only a small amount is required.

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Section: Statistic Analysismentioning

confidence: 89%

The Efficiency of a Low Dose of Biochar in Enhancing the Aromaticity of Humic-Like Substance Extracted from Poultry Manure Compost

et al. 2019

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“…HAs spectra of deeper layers of forest soil, differ from others in pronounced aliphatic bands (3 000-2 800/cm). In addition, it could be connected with more sandy substrate in forest as described by Di et al (2016). The forest HAs spectra have relatively (compared with neighboring band around 1 720/cm) Table 4.…”

Section: Drift Spectramentioning

confidence: 97%

Comparison of soil organic matter composition under different land uses by DRIFT spectroscopy

Thai¹,

Pavlů²,

Tejnecký³

et al. 2021

Plant Soil Environ.

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The study aimed to estimate and characterise soil organic matter under different land uses (cropland, grassland, and forest) and soil depths. The soil organic matter composition of the soil was assessed by diffuse reflectance infrared spectroscopy (DRIFT). Humic and fulvic acids (HAs, FAs) were extracted from soils and their compositions were evaluated by DRIFT. Low molecular mass organic acids content was also measured. Our result revealed that the largest differences of the spectra in the composition of organic matter were observed in the upper parts of the soil profile. The forest soil spectra had more intense aliphatic bands, carboxylic, and CH bands than spectra of grassland and cropland soils. The difference of HAs spectra was at 3 010 to 2 800/cm where the most intensive aliphatic bands were in forest soil HAs, followed by grassland and cropland soil HAs. The grassland topsoil FAs spectrum differs most from the other land uses. It has lower peaks around 1 660–1 600/cm and 1 200/cm than cropland and forest. The concentration of low molecular mass organic acid (LMMOA) was the highest in the forest soil and the most abundant acid was citrate.

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“…These results suggest that both soil mineralogy and DOM molecular composition contribute to DOM exportability in soils. 43,86,87 The correlations between soil sand concentration and the DOM aromaticity showed a significant correlation (Table 4). This result highlights the linkage between soil sand concentration and a specific DOM component, which agrees with the first hypothesis.…”

Section: ■ Discussionmentioning

confidence: 96%

Land-Use Change and Environmental Properties Alter the Quantity and Molecular Composition of Soil-Derived Dissolved Organic Matter

Tong

Simpson

Paul

et al. 2021

ACS Earth Space Chem.

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Dissolved organic matter (DOM) is a major pool of actively cycling organic carbon in soils, and can be exported to aquatic environments. The quantity and chemistry of DOM vary with different environmental factors, such as soil properties and climate. Accordingly, the amount and composition of DOM in soil and that which is exported to aquatic systems are likely altered by land-use change, but these aspects have not been studied with various environmental factors and associated land-use gradients in detail. To address this, both native and cultivated soil samples from North and South America were used to extract soil-derived DOM. DOM samples were isolated and analyzed for total organic carbon concentration and solution-state nuclear magnetic resonance spectroscopy. The concentration of dissolved organic carbon (DOC) was significantly correlated with soil organic carbon concentration (r = 0.869, p < 0.01, n = 14) and relative soil organic matter degradation state (r = −0.578, p < 0.05, n = 14). Land-use change decreased the controls of environmental factors on the concentration of DOC but enhanced the correlations between DOM aromaticity and mean annual precipitation (r = −0.957, p < 0.01, n = 7) and sand concentration (r = −0.867, p < 0.05, n = 7). This study found that land-use conversion and environmental conditions alter the quantity and quality of DOM distinctly and uniquely. Here, we identified the main factors that regulate the formation of soil DOM and its potential mobility in soil profiles as well as export to aquatic ecosystems.

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The effects of soil sand contents on characteristics of humic acids along soil profiles

Cited by 7 publications

References 67 publications

The Efficiency of a Low Dose of Biochar in Enhancing the Aromaticity of Humic-Like Substance Extracted from Poultry Manure Compost

The Efficiency of a Low Dose of Biochar in Enhancing the Aromaticity of Humic-Like Substance Extracted from Poultry Manure Compost

Comparison of soil organic matter composition under different land uses by DRIFT spectroscopy

Land-Use Change and Environmental Properties Alter the Quantity and Molecular Composition of Soil-Derived Dissolved Organic Matter

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