The mineralisation of fresh and humified soil organic matter by the soil microbial biomass

Brookes, Philip C.; Cayuela, María Luz; Contin, Marco; Nobili, Maria De; Kemmitt, Sarah; Mondini, Claudio

doi:10.1016/j.wasman.2007.09.015

Cited by 57 publications

(41 citation statements)

References 18 publications

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“…This may be related to the depletion of soil nutrients and surface soil moisture from high crop growth that subsequently limited microbial growth and N accumulation potential. Addition of fresh and labile organic matter can activate microbial biomass and contribute to soil C mineralization [47]. However, this does not seem to be the case with this type of biochar, which appears to be recalcitrant to microbial decomposition.…”

Section: Discussionmentioning

confidence: 95%

Application of Two Bioenergy Byproducts with Contrasting Carbon Availability to a Prairie Soil: Three-Year Crop Response and Changes in Soil Biological and Chemical Properties

Alotaibi

Schoenau

2016

Agronomy

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Abstract:The bioenergy industry produces a wide range of byproducts varying in their chemical composition depending on type of technology employed. In particular, pyrolysis and transesterification conversion processes generate C-rich byproducts of biochar (BC) and glycerol (GL), respectively, which can be added to soil. These two byproducts vary in their carbon availability, and comparing their effects when added to agricultural soil deserves attention. This study investigated the immediate and residual effects of a single application of BC and GL to a cultivated Brown Chernozem soil from the semi-arid region of southwestern Saskatchewan, Canada. In the first season following addition of amendments, BC and GL alone had no significant impact on all measured parameters. However, when combined with 50 kg urea N¨ha´1 (BC + UR), the yields obtained were similar to those with 100 kg urea N¨ha´1 alone. The GL with urea N (GL + UR) treatment had reduced crop yield and N uptake compared to urea alone in the year of application attributed to N immobilization, but had a positive residual effect in the second year due to remineralization. Both GL and GL + UR treatments enhanced dehydrogenase activity compared to other treatments whereas BC + UR tended to decrease microbial biomass C. The crop and soil response to application of biochar was less than observed in previous studies conducted elsewhere. Direct and residual effects of glycerol addition on the crop were more evident. An application rate greater than 2.8 t¨ha´1 and 3.5 t¨ha´1 for BC and GL, respectively, may be required to induce larger responses.

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Section: Discussionmentioning

confidence: 95%

Application of Two Bioenergy Byproducts with Contrasting Carbon Availability to a Prairie Soil: Three-Year Crop Response and Changes in Soil Biological and Chemical Properties

Alotaibi

Schoenau

2016

Agronomy

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“…Soil microorganisms convert fresh organic matter (FOM) entering the soil into chemically stable, biologically inactive organic matter via the so-called humification process (Brookes et al, 2008). This process is comprised of discrete steps, during which the organic matter is exposed to microbial activity.…”

Section: Introductionmentioning

confidence: 99%

Endogeic earthworms shape bacterial functional communities and affect organic matter mineralization in a tropical soil

et al. 2011

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Priming effect (PE) is defined as a stimulation of the mineralization of soil organic matter (SOM) following a supply of fresh organic matter. This process can have important consequences on the fate of SOM and on the management of residues in agricultural soils, especially in tropical regions where soil fertility is essentially based on the management of organic matter. Earthworms are ecosystem engineers known to affect the dynamics of SOM. Endogeic earthworms ingest large amounts of soil and assimilate a part of organic matter it contains. During gut transit, microorganisms are transported to new substrates and their activity is stimulated by (i) the production of readily assimilable organic matter (mucus) and (ii) the possible presence of fresh organic residues in the ingested soil. The objective of our study was to see (i) whether earthworms impact the PE intensity when a fresh residue is added to a tropical soil and (ii) whether this impact is linked to a stimulation/inhibition of bacterial taxa, and which taxa are affected. A tropical soil from Madagascar was incubated in the laboratory, with a 13 C wheat straw residue, in the presence or absence of a peregrine endogeic tropical earthworm, Pontoscolex corethrurus. Emissions of 12 CO 2 and 13 CO 2 were followed during 16 days. The coupling between DNA-SIP (stable isotope probing) and pyrosequencing showed that stimulation of both the mineralization of wheat residues and the PE can be linked to the stimulation of several groups especially belonging to the Bacteroidetes phylum. The ISME Journal (2012) 6, 213-222; doi:10.1038/ismej.2011; published online 14 July 2011 Subject Category: microbial ecology and functional diversity of natural habitats

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“…This could be interpreted by that, on the one hand, chemical fertilizers including N, P and K were always applied more in the medium fertility field, which could infiltrate and disperse in carborundum tube and result in high mineralization rate of corn stalk (Chivenge et al, 2011), on the other hand, microbial community structure, changing with different fertility, was also a regulating factor in the mineralization rate of plant-derived substance (Grayston et al, 2004). Of cause, the basis of microbial community structure and activity being consider as determinants of SOM mineralization rate have been questioned (Brookes et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Changes of the components and energy of corn stalk during decomposition process in cropland with different fertility

Liu¹,

Ni²,

Wang³

2013

Afr. J. Agric. Res.

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In order to discuss the effect of soil fertility on components transformation and energy change of corn stalk during decomposition, carborundum tube was used to study the decomposition of corn stalk buried in different soils with high, medium and low fertility for 480 days. The decomposition rate and change of energy state of corn stalk were revealed. The results showed that the fractions of alcoholbenzene soluble and water soluble decreased in the decomposition process. The concentration of semi cellulose and cellulose increased firstly and then decreased. However, the concentration of lignin increased. The change of energetic state of corn stalk throughout the whole process could be divided into three stages such as fluctuating stage, decreasing stage and stable stage. Totally, the humification was a process of energy release and the relationship of combustion heat and components of corn stalk could be expressed by linear regression. For 480 days of decomposition, the decomposition rate was highest in soil with medium fertility and lowest in soil with low fertility among three type of fertility. The decomposition of water soluble factions and lignin were promoted in medium fertile soil. However, alcohol-benzene soluble fractions, and semi cellulose and cellulose fractions were decayed accelerated in soil with high fertility. Furthermore, more humic substance was formed and energy state of decayed corn stalk was high in soil with high fertility.

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The mineralisation of fresh and humified soil organic matter by the soil microbial biomass

Cited by 57 publications

References 18 publications

Application of Two Bioenergy Byproducts with Contrasting Carbon Availability to a Prairie Soil: Three-Year Crop Response and Changes in Soil Biological and Chemical Properties

Application of Two Bioenergy Byproducts with Contrasting Carbon Availability to a Prairie Soil: Three-Year Crop Response and Changes in Soil Biological and Chemical Properties

Endogeic earthworms shape bacterial functional communities and affect organic matter mineralization in a tropical soil

Changes of the components and energy of corn stalk during decomposition process in cropland with different fertility

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