Non-labile plant C contributes to long-lasting macroaggregation of an Oxisol

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorMartins, Márcio R.
dc.creatorAngers, Denis A.
dc.creatorCorá, José E.
dc.date2014-05-27T11:28:34Z
dc.date2016-10-25T18:45:00Z
dc.date2014-05-27T11:28:34Z
dc.date2016-10-25T18:45:00Z
dc.date2013-03-01
dc.date.accessioned2017-04-06T02:15:16Z
dc.date.available2017-04-06T02:15:16Z
dc.identifierSoil Biology and Biochemistry, v. 58, p. 153-158.
dc.identifier0038-0717
dc.identifierhttp://hdl.handle.net/11449/74688
dc.identifierhttp://acervodigital.unesp.br/handle/11449/74688
dc.identifier10.1016/j.soilbio.2012.11.011
dc.identifierWOS:000317158300019
dc.identifier2-s2.0-84871648327
dc.identifierhttp://dx.doi.org/10.1016/j.soilbio.2012.11.011
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/895449
dc.descriptionDecomposition of plant material influences soil aggregation dynamics in ways that are still poorly understood, especially for Oxisols, in which oxides are believed to play a dominant role. In an incubation experiment, we investigated (i) the effect of plant material addition from selected monocot and dicot species on soil organic C (SOC), carbohydrate composition, fungal and total microbial biomass, and aggregation of an Oxisol; and (ii) the relationship among these properties and C mineralization patterns. The experiment was carried out at 25 °C for 180 d after addition of 11 plant materials (4 g C kg-1 soil) and a control (no plant material added). Mineralization of C during the incubation was described considering two pools of C (labile and non-labile) using a first-order plus linear fitting. Compared to the control, corn materials showed larger pentose input, greater mineralization rates for the non-labile C pool (k), greater soil pentose content (xylose + arabinose) and larger mean weight diameter of soil water-stable aggregates at 180 d of incubation. These effects were independent of changes in SOC content, suggesting that total C accrual and macroaggregation may be decoupled processes in this Oxisol. Our results support the hypothesis that the non-labile plant C pool contributes to the long-lasting stability of macroaggregates of this Oxisol and that this effect is mediated by plant and soil pentoses. We propose that plant pentose content and the decomposition rate of the slow pool (k) are useful parameters for the prediction of plant effects on aggregation dynamics of Oxisols and the selection of soil conservation practices. © 2012.
dc.languageeng
dc.relationSoil Biology and Biochemistry
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAggregate
dc.subjectCarbohydrates
dc.subjectCarbon pools
dc.subjectMineralization model
dc.subjectNon-labile carbon
dc.subjectOxisol
dc.subjectAggregation dynamics
dc.subjectC mineralization
dc.subjectCarbon pool
dc.subjectConservation practices
dc.subjectDecomposition rate
dc.subjectFirst-order
dc.subjectLinear fitting
dc.subjectLong lasting
dc.subjectMacroaggregates
dc.subjectMean weight diameter
dc.subjectMicrobial biomass
dc.subjectOxisols
dc.subjectPlant material
dc.subjectSoil aggregation
dc.subjectSoil organic C
dc.subjectAggregates
dc.subjectCarbon
dc.subjectDynamics
dc.subjectExperiments
dc.subjectForestry
dc.subjectMineralogy
dc.subjectOrganic carbon
dc.subjectSoil conservation
dc.subjectSoil moisture
dc.subjectLakes
dc.subjectbiomass
dc.subjectbiomineralization
dc.subjectcarbohydrate
dc.subjectdecomposition
dc.subjectmacroaggregate
dc.subjectsoil aggregate
dc.subjectsoil carbon
dc.subjectsoil conservation
dc.subjectsoil microorganism
dc.subjectsoil organic matter
dc.subjectDicotyledoneae
dc.subjectZea mays
dc.titleNon-labile plant C contributes to long-lasting macroaggregation of an Oxisol
dc.typeOtro


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