Chemodiversity of Soil Dissolved Organic Matter

Ding, Yang; Shi, Zhenqing; Ye, Qianting; Yao, Liang; Liu, Minqin; Dang, Zhi; Wang, Yujun; Liu, Chongxuan

doi:10.1021/acs.est.0c01136

Cited by 181 publications

(118 citation statements)

References 57 publications

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“…Observed complexity in OM adsorptive processes is rooted in the inherent diversity of the reactants. Organic matter encompasses a complex, heterogeneous continuum of structure, processing, and functional diversity [59][60][61] . Even among small organic compounds, this variety enables adsorption through a combination of multiple anchoring points and mechanisms 62,63 (Fig.…”

Section: [H1] Adsorptionmentioning

confidence: 99%

Dynamic interactions at the mineral–organic matter interface

Kleber

Bourg

Coward

et al. 2021

Nat Rev Earth Environ

513

369

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Minerals are widely assumed to protect organic matter (OM) from degradation in the environment, promoting the persistence of carbon in soil and sediments. In this Review, we describe the mechanisms and processes operating at the mineral-organic interface as they relate to OM transformation dynamics. A broad set of interactions occur, with minerals adsorbing organic compounds to their surfaces and/or acting as catalysts for organic reactions. Minerals can serve as redox partners for OM through direct electron transfer or by generating reactive oxygen species, which then oxidize OM. Finally, the compartmentalization of soil and sediment by minerals creates unique microsites that host diverse microbial communities. Acknowledgement of this multiplicity of interactions suggests the general assumption that the mineral matrix provides a protective function for organic matter is overly simplistic. Future work must recognize adsorption as a condition for further reactions instead of as a final destination for organic adsorbates, and should consider the spatial and functional complexity that is characteristic of the environments where mineral-OM interactions are observed.

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Section: [H1] Adsorptionmentioning

confidence: 99%

Dynamic interactions at the mineral–organic matter interface

Kleber

Bourg

Coward

et al. 2021

Nat Rev Earth Environ

513

369

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“…In this study, the water-extractable organic carbon was used to instead of the organic carbon in soil solution. Although the water-extractable organic carbon does not exclusively re ect the in-situ dissolved composition, the water-extractable organic carbon contains almost all the carbon groups in the soil solution and does not affect the characterization of dissolved organic carbon composition (Ding et al 2020). Therefore, the water-extractable organic carbon was considered equivalent to the dissolved organic carbon in soil samples and henceforth is referred to as DOC.…”

Section: Doc Preparation and Characterizationmentioning

confidence: 99%

“…Therefore, the water-extractable organic carbon was considered equivalent to the dissolved organic carbon in soil samples and henceforth is referred to as DOC. The extraction method was provided by Ding et al (2020). Brie y, soil samples (soil: water = 3: 5) were shaken (24 h at 25°C), centrifuged (4000 r, 30 min) and ltered (0.45 µm polyether sulfone lters).…”

Section: Doc Preparation and Characterizationmentioning

confidence: 99%

“…The likely primary mechanisms of DOC turnover are molecular self-assembly and microbial transformation (Roth et al 2019). Low-weight molecular compounds are assembled into medium-and high-weight molecular compounds to promote DOC persistence (Ding et al 2020). Microorganisms metabolically consume DOC components and produce new microbial-derived compounds via the degradation of organic matter (Bowen et al 2009).…”

Section: Mediation Of Effects Of Soil Physiochemical Factors On Doc Turnovermentioning

confidence: 99%

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Long-Term Fertilization Alters the Chemical Composition of Dissolved Organic Carbon via Regulating Soil Physicochemical Factors

Zhang¹,

Shengzhe²,

Wang³

et al. 2021

Preprint

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Soil dissolved organic carbon (DOC) plays a key role in fundamental biogeochemical processes; however, the influences of different types of fertilization on the chemical composition and properties of DOC molecules in soils are poorly understood. In this study, DOC samples were extracted from gray desert soils treated with five fertilization treatments 1) chemical nitrogen, phosphorus and potassium fertilizers; 2) pig and cattle manure; 3) 50% nitrogen from manure and 50% nitrogen from chemical fertilizer; 4) total chemical fertilizers and total manure; and 5) no fertilization (control). Data were compared by a combination of Fourier-transform infrared spectroscopy, 13C nuclear magnetic resonance, and statistical analyses. Results showed that manure application increased the aliphatic carbon and decreased the aromatic carbon levels, implying manure application promotes the transformation of labile carbon to stable carbon structures. Redundancy analysis indicated that available nutrients and available forms of magnesium were positively associated with the labile carbon groups, and the available forms of calcium were positively associated with the stable carbon groups. These results demonstrated that the availability of soil nutrients and minerals are influential factors on DOC turnover. Moreover, our results showed that fertilization method had negative direct effects on DOC transformation and positive indirect effects on DOC turnover via soil physicochemical factors, and various forms of mineral ions were the strongest explanatory factors of DOC variation. These findings indicated that soil physicochemical factors play an important role as mediators in the influence of fertilization practices on the chemical composition of DOC and turnover of carbon-containing functional groups in DOC.

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“…Therefore, the properties of WEOM are important indicators of soil quality (Bongiorno et al, 2019). The chemodiversity of WEOM has been related to soil physical-chemical properties and soil microbial community characteristics (Roth et al, 2019;Ding et al, 2020). Anthropogenic irruptions, such as global warming, increased nitrogen deposition, and frequently occurring fires, could also alter the composition of WEOM (Dittmar et al, 2012;Fröberg et al, 2013;Wang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Depletion of Soil Water-Extractable Organic Matter With Long-Term Coverage by Impervious Surfaces

Wang

Zhang

Majidzadeh

et al. 2021

Front. Environ. Sci.

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Water-extractable organic matter (WEOM) in soil is the critical substrate that fuels microbial-driven biogeochemical cycles. However, questions remain regarding whether and how expanding impervious surface area under global urbanization may alter soil WEOM cycling. Based on absorbance and fluorescence spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), we compared the content and chemical signatures of soil WEOM under impervious surfaces with those in adjoining open areas and evaluated the impacts of types (complete sealing by concrete and partial sealing by house structures) and durations (1.5, 27, and 114 years) of impervious surface coverage. The content of soil WEOM and its chromophoric and fluorescent fractions were not significantly changed (less than 20%) after 1.5 years of coverage by concrete and house structures. However, these parameters decreased by more than 30% with 27 and 114 years of coverage by the residential home structures. The microbial-humic-like and protein-like fluorescent WEOM persisted preferentially over the terrestrial-humic-like and nonfluorescent WEOM. FT-ICR MS results suggest various degrees of depletion of biochemical groups in WEOM. While the water-extractable lipid-like compounds increased with 1.5 years of coverage, all studied biochemical groups were depleted with long-term coverage, which might reduce the microbial processing of suberin-derived compounds. This study highlights the remarkable impacts of soil sealing on reducing substrate availability for microbial carbon processing in urban environments.

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Chemodiversity of Soil Dissolved Organic Matter

Cited by 181 publications

References 57 publications

Dynamic interactions at the mineral–organic matter interface

Dynamic interactions at the mineral–organic matter interface

Long-Term Fertilization Alters the Chemical Composition of Dissolved Organic Carbon via Regulating Soil Physicochemical Factors

Depletion of Soil Water-Extractable Organic Matter With Long-Term Coverage by Impervious Surfaces

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