Organic Carbon Amendments Affect the Chemodiversity of Soil Dissolved Organic Matter and Its Associations with Soil Microbial Communities

Li, Xiaoming; Chen, Qinglin; He, Chen; Shi, Quan; Chen, Songcan; Reid, Brian J.; Zhu, Yan; Sun, Guoxin

doi:10.1021/acs.est.8b04673

Cited by 176 publications

(89 citation statements)

References 63 publications

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“…Aliphatic and low-polar compounds are preferentially dissolved in the soil solution, whereas unsaturated, aromatic and highly polar compounds tend to be adsorbed onto soil particles (Huang et al, 2019). Furthermore, total soil nitrogen and organic carbon content increased by long-term fertilization is influencing the activity of the soil bacterial community, which in turn will affect soil DOM composition (Li et al, 2019). In our study even, the impact of fertilization was controlled by soil texture.…”

Section: Composition Of Leached Organic Mattermentioning

confidence: 54%

“…Ferrari et al (2011) suggested that long-term organic fertilization led to an enrichment of organic N, thus enhancing the lignin decomposition of crop residues. However, mineral fertilization resulted in an enrichment of hydrophilic compounds (McDowell et al, 2004) or enhanced labile organic compounds, such as carbohydrates, amino sugars, and proteins (Li et al, 2019). In a 56-days incubation experiment, mineral fertilization with NH 4 Cl accelerated microbial turnover of labile organic carbon, while the decomposition of recalcitrant soil organic matter declined (Zang et al, 2017).…”

Section: Composition Of Leached Organic Mattermentioning

confidence: 99%

“…Microbes might have lowered the decomposition of soil organic matter because their requirements were met by N fertilization (Zang et al, 2017). However, other studies showed that long-term fertilization can modify soil microbial decomposer communities, thus overlaying the effects of soil distinct properties and harmonizing DOM composition of soil humic substances (Li et al, 2019;Wu M. et al, 2019a).…”

Section: Composition Of Leached Organic Mattermentioning

confidence: 99%

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Short-term effects of fertilization on dissolved organic matter (DOM) in soil leachate

Tiefenbacher

Weigelhofer

Klik

et al. 2020

Preprint

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Abstract. Besides the importance of dissolved organic matter (DOM) in soil biogeochemical processes, there is still a debate on how agricultural intensification affects the composition and concentration of dissolved organic matter leached from soils into adjacent aquatic ecosystems. In order to investigate the immediate response of DOM leaching to fertilization, we conducted a short-term (45 day) lysimeter experiment with undisturbed silt loam and loamy sand soil cores. Mineral (calcium ammonium nitrate) or organic (pig slurry) fertilizer was applied on the soil surface with a concentration equivalent to 130 kg N ha−1. After fertilization, soil leachate was collected in 6-days intervals. Dissolved organic carbon concentrations (DOC) were measured with gas chromatography, while shifts in DOM composition were analysed using absorbance and excitation- emission fluorescence indices from peak-picking as well as from PARAFAC analysis. During the first 12 days, fertilization of a silt loam reduced DOC concentrations in the leachate and shifted its composition towards more microbial- like compounds. Additionally, the discrepancy in DOM composition between fertilizer and control treatments of a silt loam increased with time. However, in loamy sand only mineral fertilization affected organic matter leaching and decreased DOC concentrations in the leachate during the first 12 days. Furthermore, mineral fertilization of the loamy sand led to DOM compounds with low molecular size in the first 12 days. Our results show that fertilization tends to increase microbial transformed DOM, while it reduces leached DOC concentrations. Furthermore, the magnitude of fertilization on DOC concentrations and DOM composition was highly depending on the soil texture they originate from. However, in our set-up, the experimental soil units were restricted to a soil depth of 16 cm (Ap horizon). At ecosystem level, a sufficiently long soil passage might mitigate the impact of fertilization on soil DOM.

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Section: Composition Of Leached Organic Mattermentioning

confidence: 54%

Section: Composition Of Leached Organic Mattermentioning

confidence: 99%

Section: Composition Of Leached Organic Mattermentioning

confidence: 99%

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Short-term effects of fertilization on dissolved organic matter (DOM) in soil leachate

Tiefenbacher

Weigelhofer

Klik

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…As suggested by Kallenbach et al (2019), a mixture of crop residues of different C:N ratios could therefore achieve a more diverse microbial community comprising organisms fulfilling niches of both high and low inherent CUE windows, and may 85 enable all species to operate at their maximum CUE. Other authors have also suggested the possibility of manipulating the functionality of the soil microbial community with soil amendments, such as Li et al (2019) who report that microbes in a eutrophic system are stimulated by organic carbon amendments and oligotrophic microbes are stimulated by chemical fertilisers. Studies have also demonstrated that changes in tree litter diversity affect both fungal and bacterial diversity (Otsing et al, 2018;Santonja et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Obtaining more benefits from crop residues as soil amendments by application as chemically heterogeneous mixtures

Struijk¹,

Whitmore²,

Mortimer³

et al. 2020

Preprint

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Abstract. Crop residues are valuable soil amendments in terms of the carbon and other nutrients they contain, but incorporation of residues does not always translate into increases in nutrient availability, soil organic matter (SOM), soil structure, and overall soil fertility. Studies have demonstrated accelerated decomposition rates of chemically heterogeneous litter mixtures, compared to the decomposition of individual litters, in forest and grassland systems. Mixing high C : N ratio with low C : N ratio amendments may result in greater carbon use efficiency and non-additive benefits in soil properties (i.e. mixture ≠ sum of the parts). We hypothesised that non-additive benefits would accrue from mixtures of low-quality (straw or woodchips) and high-quality (vegetable-waste compost) residues applied before lettuce planting in a full-factorial field experiment. Properties indicative of soil structure and nutrient cycling were used to assess benefits from residue mixtures, including soil respiration, aggregate stability, bulk density, SOM, available and potentially mineralisable N, available P, K and Mg, and crop yield. Soil organic matter and mineral nitrogen levels were significantly and non-additively greater in the straw-compost mixture compared to individual residues, which mitigated the N immobilisation occurring with straw-only applications. Addition of compost significantly increased soil available N, K and Mg levels. Together, these observations suggest that greater nutrient availability improved the ability of decomposer organisms to degrade straw in the straw-compost mixture. We demonstrate that mixtures of crop residues can influence soil properties non-additively. Thus, greater benefits may be achieved by removing, mixing, and re-applying crop residues, than by simply returning them to the soils in situ.

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“…Increasingly more evidence is emerging that SOM accumulation is primarily derived from the production of microbial residues (Ludwig et al, 2015;Simpson et al, 2007), and this microbially derived SOM seems to be produced in the early stages of plant residue decomposition (Cotrufo et al, 2015). Microbial carbon use efficiency (CUE) describes a functional trait of microbes that refers to the fraction of carbon assimilated from organic matter additions to the soil system compared to C losses to the atmosphere via microbial respiration (Allison et al, 2010).…”

mentioning

confidence: 99%

Obtaining more benefits from crop residues as soil amendments by application as chemically heterogeneous mixtures

Struijk

Whitmore

Mortimer

et al. 2020

SOIL

View full text Add to dashboard Cite

Abstract. Crop residues are valuable soil amendments in terms of the carbon and other nutrients they contain, but the incorporation of residues does not always translate into increases in nutrient availability, soil organic matter (SOM), soil structure, and overall soil fertility. Studies have demonstrated accelerated decomposition rates of chemically heterogeneous litter mixtures, compared to the decomposition of individual litters, in forest and grassland systems. Mixing high C:N ratio with low C:N ratio amendments may result in greater carbon use efficiency (CUE) and nonadditive benefits in soil properties. We hypothesised that nonadditive benefits would accrue from mixtures of low-quality (straw or woodchips) and high-quality (vegetable waste compost) residues applied before lettuce planting in a full factorial field experiment. Properties indicative of soil structure and nutrient cycling were used to assess the benefits from residue mixtures, including soil respiration, aggregate stability, bulk density, SOM, available N, potentially mineralisable N, available P, K, and Mg, and crop yield. Soil organic matter and mineral N levels were significantly and nonadditively greater in the straw–compost mixture compared to individual residues, which mitigated the N immobilisation occurring with straw-only applications. The addition of compost significantly increased available N, K, and Mg levels. Together, these observations suggest that greater nutrient availability improved the ability of decomposer organisms to degrade straw in the straw–compost mixture. We demonstrate that mixtures of crop residues can influence soil properties nonadditively. Thus, greater benefits may be achieved by removing, mixing, and reapplying crop residues than by simply returning them to the soils in situ.

show abstract

Organic Carbon Amendments Affect the Chemodiversity of Soil Dissolved Organic Matter and Its Associations with Soil Microbial Communities

Abstract: Organic carbon amendments affect the chemodiversity of soil dissolved organic matter and its associations with soil microbial communities

Cited by 176 publications

References 63 publications

Short-term effects of fertilization on dissolved organic matter (DOM) in soil leachate

Short-term effects of fertilization on dissolved organic matter (DOM) in soil leachate

Obtaining more benefits from crop residues as soil amendments by application as chemically heterogeneous mixtures

Obtaining more benefits from crop residues as soil amendments by application as chemically heterogeneous mixtures

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