Physical, chemical, and biochemical mechanisms of soil organic matter stabilization under conservation tillage systems: A central role for microbes and microbial by-products in C sequestration

Plaza, César; Courtier‐Murias, Denis; Fernández, José M.; Polo, Alfredo; Simpson, André J.

doi:10.1016/j.soilbio.2012.07.026

Cited by 205 publications

(164 citation statements)

References 49 publications

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“…The interaction of organic molecules occurs with polyvalent cations and mineral particles of the clay fraction and oxides, especially by iron oxides in the form of hematite (Fe 2 O 3 ) and goethite (FeOOH), predominant in the soil under study. These forms, in general, characterize occlusion of soil organic matter by physical-chemical mechanisms of protection, which, once established in the soil microaggregates, confer their trait of recalcitrance and limit the accessibility of decomposer microorganisms, enzymes, and the action of acid hydrolysis of the method used in this study (Passos et al, 2007;Plaza et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Organic Nitrogen in a Typic Hapludox Fertilized With Pig Slurry

Grohskopf

Cassol

Corrêa

et al. 2015

Rev. Bras. Ciênc. Solo

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The application of pig slurry may have a different effect on nitrogen dynamics in soil compared to mineral fertilization. Thus, the aim of this study was to determine the different forms of organic n in a latossolo Vermelho distroférrico (Typic Hapludox) and their relationship to n uptake by crops in response to 10 years of annual application of pig slurry and mineral fertilizer. The treatments were application rates of 0, 25, 50, 100, and 200 m 3 ha -1 of pig slurry, in addition to mineral fertilizer, organized in a randomized block design with four replications. The n contents were determined in the plant tissue and in the forms of total n and acid hydrolyzed fractions: ammonium-n, hexosamine-n, α-amino-n, amide-n, and unidentified-N. Annual application of pig slurry or mineral fertilizer increased the total-N content in the 0-10 cm depth layer. The main fractions of organic N in the soil were α-amino-N when pig slurry was applied and unidentified-N in the case of mineral fertilizers. Pig slurry increased the N fractions considered as labile: α-amino-N, ammonium-N, and amide-N. The increase in these labile organic n fractions in the soil through pig slurry application allows greater n uptake by the maize and oat crops in a no-tillage system.

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Section: Resultsmentioning

confidence: 99%

Organic Nitrogen in a Typic Hapludox Fertilized With Pig Slurry

Grohskopf

Cassol

Corrêa

et al. 2015

Rev. Bras. Ciênc. Solo

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“…The findings are consistent with previous observations (Plaza et al, 2013). This might result from the preferential enrichment of N-containing compounds (e.g., those of protein, microbial byproduct etc.)…”

Section: Discussionsupporting

confidence: 93%

Rehabilitation of organic carbon and microbial community structure and functions in Cu-Pb-Zn mine tailings for in situ engineering technosols

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Base metal mine tailings phytostabilisation has been severely hindered by the lack of growth media (soil and inert overburden), and associated hydrogeochemical instability, and phytotoxicity in the tailings. A new paradigm of in situ engineered pedogenesis of tailings into functional technosols has been proposed as a cost-effective and sustainable solution.This project aimed to understand critical factors and processes driving soil formation towards functional technosols in Cu-Pb-Zn tailings, which may be manipulated and stimulated by ecological engineering inputs (e.g., organic amendments, microbial inoculum, and pioneer plants). further accelerated technosols formation in the amended tailings, significantly stimulating OC stabilisation, microbial biomass and functions. While the amended tailings were far from reaching the desired hydrogeochemical stability, the pioneer native plant species were proven to be critical to the colonisation of heterotrophic bacteria and associated biogeochemical processes.Organic matter properties (e.g., labile OC, C: N ratio) induced biogeochemical changes in the tailings with different directions. In a 6-month microcosm experiment, the weathered and neutral Cu-Pb-Zn tailings were amended with plant litter (Acacia chisolmii) and biochar. Topsoil underneath native plant communities rich in microbial inoculums may be used to rapidly prime microbial diversity in the amended tailings. In an 8-week microcosm experiment, the weathered and neutral Cu-Pb-Zn tailings were inoculated with native soils, which had been amended with sugarcane as the base treatment. The colonisation of heterotrophic bacteria and fungi were observed in the tailings-soil mix, strongly linkedto the microbial biomass and functions. Microbial biomass and enzymatic activities increased by 1.5-8 folds in the tailings-soil mix compared to the control, depending on soil addition rates.25 % soil addition doubled the microbial diversity in the tailings-soil mix compared to the control. 50 % soil addition achieved a respiratory quotient, and C and N cycling processes similar to those of the native soil. Again, Proteobacteria and Bacteroidetes significantly stimulated in the tailings-soil mix. Stresses including EC (thus S) and total heavy metals (Pb, Zn) had negatively impacts on microbial community.Biogeochemical changes were investigated in fresh Cu-Mo-Au tailings (containing low levels of reactive minerals with stable hydrogeochemistry) in response to organic amendments (i.e., sugarcane and biochar) and introduction of native grass (Iseilema vaginiflorum) and leguminous shrub (Acacia chisholmii). Microbial diversity were 2-4 folds in all the amended/revegetated tailings compared to the control. Microbial biomass and enzymatic activities in sugarcane amended and revegetated tailings significantly increased by 4-25 folds, with stimulated abundance of Bacteroidetes and the dominance of heterotrophic bacteria (e.g., Algoriphagus sp. Sphingopyxis sp., Sediminibacterium sp., Planctomyces sp.), enhancing plants growth....

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“…OM has large specific surface, negative net charge dependent on pH, ease of imbibition of water and soil solution containing metals and capacity to form organic chelates (Plaza et al, 2013). Cu can be complexed to OM in insoluble organic forms, being little available.…”

Section: Resultsmentioning

confidence: 99%

Copper and zinc forms in soil fertilized with pig slurry in the bean crop

Grohskopf

Corrêa

Cassol

et al. 2016

Rev. bras. eng. agríc. ambient.

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The application of pig slurry may have different influence on copper (Cu) and zinc (Zn) dynamics in the soil compared with mineral fertilization. The aim of this research was to determine the different forms of Cu and Zn in soil and their uptake by bean plants in response to the application of mineral fertilizer and pig slurry (PS). The treatments were: mineral fertilizer (Cu and Zn oxides) and liquid pig slurry, at increasing rates (0/0, 1.7/6.0, 3.4/12.0 and 6.8/24.0 kg ha-1 Cu/Zn, respectively) applied in a Rhodic Kandiudox. PS increased the Cu content in soil in the exchangeable form, Fe oxides and residual, while the mineral fertilizer increased Cu contents in the fraction associated with soil organic matter. Soil Zn contents in the fractions available, exchangeable and SOM were highest under mineral fertilization, while in the soluble fraction the contents were highest under PS. The fertilizers had not impact on Cu and Zn contents associated with Al oxides, and these elements were mostly associated with Fe oxides in the soil. PS promoted the highest biomass production in shoots and roots of the bean plants, reflecting in the highest accumulation of Cu and Zn.

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Physical, chemical, and biochemical mechanisms of soil organic matter stabilization under conservation tillage systems: A central role for microbes and microbial by-products in C sequestration

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Cited by 205 publications

References 49 publications

Organic Nitrogen in a Typic Hapludox Fertilized With Pig Slurry

Organic Nitrogen in a Typic Hapludox Fertilized With Pig Slurry

Rehabilitation of organic carbon and microbial community structure and functions in Cu-Pb-Zn mine tailings for in situ engineering technosols

Copper and zinc forms in soil fertilized with pig slurry in the bean crop

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