Evaluating biodegradability of soil organic matter by its thermal stability and chemical composition

Gregorich, E.G.; Gillespie, Adam; Beare, Michael H.; Curtin, D.; Sanei, Hamed; Yanni, Sandra F.

doi:10.1016/j.soilbio.2015.08.032

Cited by 94 publications

(60 citation statements)

References 39 publications

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“…There was no significant effect of application of used sewage sludge on lowering soil pH, whereas Domene et al (2010), Murtaza et al (2011) as well as Paz-Ferreiro et al (2012) showed in their studies that the use of municipal sewage sludge in agriculture caused an increase in soil acidity. It is associated with the presence of acid substances generated as a result of microbiological decomposition and humification of organic matter (Gregorich et al 2015). A statistically insignificant increasing trend in the content of organic carbon, total nitrogen and of available forms phosphorus, potassium and magnesium was observed in the presented experiment.…”

Section: Basic Soil Propertiesmentioning

confidence: 55%

The effect of municipal sewage sludge on the content, use and mass ratios of some elements in spring barley biomass

Kępka¹,

Antonkiewicz²,

Gambuś³

et al. 2017

Soil Science Annual

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Municipal sewage sludge contains considerable amounts of macro and microelements essential for plant nutrition. With decreasing use of natural and organic fertilizers, there is a need to search for alternative sources of organic matter (which is a substrate for humus reproduction). In a field experiment carried out on heavy soil with neutral reaction, the effect of single application of municipal sewage sludge in a dose of 5.34 Mg⋅ha -1 DM was compared to an equivalent dose of mineral fertilizers. The test plant was spring barley. After application of municipal sewage sludge, slight positive changes in the chemical properties of the soil were observed. The sewage sludge increased the yield of spring barley grain and straw by, respectively, 14 and 13% in relation to treatment with mineral fertilization. Spring barley fertilized with sewage sludge contained more elements than barley grown only on mineral fertilizers. It was shown that application of municipal sewage sludge to the soil had a significant effect on increase in nutrient uptake by spring barley. Fe was taken up in the highest amount, followed by Al and Mn, and Co was taken up in the smallest amounts. Utilization of Fe, Mn, Co and Al from sewage sludge by spring barley was at 6.0, 4.7, 0.7 and 0.7%, respectively of the amount applied to the soil with this waste. The mass ratios (Fe:Mn, Fe:Al, Mn:Co) analyzed in spring barley biomass were much wider in straw than in grain. In terms of grain feed value, Fe:Mn ratio in grain and straw was greater than optimum.

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Section: Basic Soil Propertiesmentioning

confidence: 55%

The effect of municipal sewage sludge on the content, use and mass ratios of some elements in spring barley biomass

Kępka¹,

Antonkiewicz²,

Gambuś³

et al. 2017

Soil Science Annual

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“…Because the clay-silt complex was similar across soils, microbial access to carbon pools was regulated by organic matter composition and encapsulation within aggregates. The soil under pasture that favored aggregation contained the largest amount of easily decomposable polysaccharides from recent plant residues while that under fallow showed smaller carbon content with higher concentration of recalcitrant polyphenols [26]. The sand fraction contained more easily biodegradable carbon forms compared to silt or clay.…”

Section: Classical First-order Kineticsmentioning

confidence: 98%

“…A computational example was retrieved from literature [26]. Briefly, a silt loam soil maintained under pasture, annual cropping or bare fallow during 11 consecutive years was sieved to less than 4 mm, incubated in the laboratory for 98 days, and monitored for CO 2 production.…”

Section: Computational Examplementioning

confidence: 99%

“…As expected from the theory on carbon sequestration [18] [20] and in conformity with the fractal hypothesis [7], CO 2 release during organic matter decomposition is accelerated Table 1. Fractal first-order parameters of organic matter decomposition in soil (data retrieved from [26]. under conventional tillage that destroys soil aggregates and increases the exposure to microbial attacks of the formerly aggregate-protected organic matter [27].…”

Section: Fractal Kineticsmentioning

confidence: 99%

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Fractal Kinetics Parameters Regulating Carbon Decomposition Rate under Contrasting Soil Management Systems

Parent¹

2017

OJSS

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Agricultural soils can sequester and release large amounts of carbon. Accessibility of soil carbon to microbial attacks depends on biological, chemical, and physical protection mechanisms such as organic matter composition and particle size, soil aggregation, and chemical protection through the silt-clayorganic matter complex. While soil and organic matter are fractal objects controlling exposure of reactive surfaces to the environment, soil aggregation and biomass production and quality are regulated by agricultural practices. Organic matter decomposition in soil is generally described by the classical first-order kinetics equations fitted to define distinct carbon pools. By comparison, fractal kinetics assigns a coefficient to adjust time-dependent decomposition rate of total soil carbon to protection mechanisms. Our objective was to relate fractal parameters of organic matter decomposition to soil management systems. Retrieving published data, the decomposition of organic matter was modeled in a silt loam soil maintained under pasture, annual cropping or bare fallow during 11 years. The classical first-order kinetics model returned quadratic relationships indicating that reactive carbon decreased with time. Fractal kinetics rectified the relationships successfully.Initial decomposition rate (k 1 at t = 1) was 7 × 10 −4 for pasture, 1 × 10 −4 for annual cropping, and 0.5 × 10 −4 for bare-soil fallow. Fractal coefficients h were 0.71, 0.45, and 0.25 for pasture, annual cropping and fallow, respectively. Due to aggregation, physical protection against microbial attacks was highest under pasture management, leading to higher carbon sequestration despite higher biomass production and "priming" effects. Parameters k 1 and h proved to be useful indicators for soil quality classification integrating the opposite effects of labile carbon decomposition and carbon protection mechanisms that regulate the decomposition rate of organic matter with time as driven by soil management practices.

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“…Rovira et al, 2008;Plante et al, 2009;Gregorich et al, 2015). Several studies using thermal analysis techniques such as thermogravimetry and differential scanning calorimetry during ramped combustion have shown Biogeosciences Discuss., https://doi.org /10.5194/bg-2018-15 Manuscript under review for journal Biogeosciences Discussion started: 7 February 2018 c Author(s) 2018.…”

Section: Introductionmentioning

confidence: 99%

A model based on Rock-Eval thermal analysis to quantify the size of the centennially persistent organic carbon pool in temperate soils

Cécillon¹,

Baudin²,

Chenu³

et al. 2018

Preprint

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Abstract. Changes in global soil carbon stocks have considerable potential to influence the course of future climate change.However, a portion of soil organic carbon (SOC) has a very long residence time (> 100 years) and may not contribute 15 significantly to terrestrial greenhouse gas emissions during the next century. The size of this persistent SOC reservoir is presumed to be large. Consequently, it is a key parameter required for the initialization of SOC dynamics in ecosystem and Earth system models, but there is considerable uncertainty in the methods used to quantify it. Thermal analysis methods provide cost-effective information on SOC thermal stability that has been shown to be qualitatively related to SOC biogeochemical stability. The objective of this work was to build the first quantitative thermal analysis based model of the 20 size of the centennially persistent SOC pool. We used a unique set of soil samples from four agronomic experiments in Northwestern Europe with long-term bare fallow and non-bare fallow treatments (e.g. manure amendment, cropland and grassland), as a sample set for which estimating the size of the centennially persistent SOC pool is relatively straightforward.At each experimental site, we estimated the average concentration of centennially persistent SOC and its uncertainty by applying a Bayesian curve fitting method on the observed declining SOC concentration over the duration of the long-term 25 bare fallow treatment. Overall, the estimated concentrations of centennially persistent SOC ranged from 5 to 11 gC.kg-1 soil (lowest and highest boundaries of four 95% confidence intervals). Then, by dividing site-specific concentrations of persistent SOC by the total SOC concentration of 118 archived soil samples from long-term bare fallow and non-bare fallow treatments, we could estimate the proportion of centennially persistent SOC in the samples and the associated uncertainty.The proportion of centennially persistent SOC ranged from 0.14 (standard deviation of 0.01) to 1 (standard deviation of 30 0.15). Samples were subjected to thermal analysis by Rock-Eval 6 that generated a series of 30 parameters reflecting their SOC thermal stability and bulk chemistry. The sample set was split into a calibration set (n = 88) and a validation set (n = 30). We trained a non-parametric machine learning algorithm (random forests multivariate regression model) that accurately samples from similar pedoclimates. Our study strengthens the evidence for a link between the thermal and biogeochemical stability of soil organic matter, and demonstrates that Rock-Eval 6 thermal analysis can be used to quantify the size of the centennially persistent organic carbon pool in temperate soils.

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Evaluating biodegradability of soil organic matter by its thermal stability and chemical composition

Cited by 94 publications

References 39 publications

The effect of municipal sewage sludge on the content, use and mass ratios of some elements in spring barley biomass

The effect of municipal sewage sludge on the content, use and mass ratios of some elements in spring barley biomass

Fractal Kinetics Parameters Regulating Carbon Decomposition Rate under Contrasting Soil Management Systems

A model based on Rock-Eval thermal analysis to quantify the size of the centennially persistent organic carbon pool in temperate soils

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