DISTRIBUTION OF CARBON IN SIZE-FRACTIONS OF A PASTURE SOIL 26 MONTHS AFTER ADDING BIOCHAR

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dc.citation.issueOccasional Report No. 31en_US
dc.contributor.authorCalvelo Pereira, Ren_US
dc.contributor.authorCamps-Arbestain, Men_US
dc.contributor.authorSaiz Rubio, Ren_US
dc.contributor.authorKong, Yen_US
dc.contributor.authorShen, Qen_US
dc.contributor.editorCurrie, LDen_US
dc.contributor.editorChristensen, CLen_US
dc.coverage.spatialPalmerston North, New Zealanden_US
dc.date.available2018en_US
dc.date.finish-date9/02/2018en_US
dc.date.issued2018en_US
dc.date.start-date7/02/2018en_US
dc.description.abstractFractionating soils according to size and/or density of particles improves our understanding of the importance of interactions between organic and inorganic soil components on the turnover of soil organic carbon (SOC). Conventional soil physical fractionation methodologies misrepresent the contribution of pyrogenic C (e.g., biochar-derived C) to the total SOC because of the relative long turnover time of this fraction, regardless the physical SOC physical fraction in which this is found. In this study, a combination of particle size fractionation and wet sieving, as well as chemical analysis (dichromate oxidation) was tested to isolate meaningful SOC fractions in a set of 34 soils with C content ranging from 19.1–43.0 g SOC/kg soil. Topsoil and subsoil samples were obtained after 26 months of simulating cultivation at pasture renewal including pine biochar (10 t/ha) as amendment (below 10 cm depth) and growth of contrasted plant species (ryegrass vs a mixture of red clover and cocksfoot) in a lysimeter experiment using a silt loam soil (Tokomaru soil, a Pallic soil with limited drainage at depth). Across all the soils considered, the allocation of SOC in size-fractions (i.e., 2000-200, 250-53 and <53 m) was obtained by conventional wet sieving. Additionally, the total content of resistant forms of SOC (i.e.both alkyl C forms and pyrogenic C from biochar) was calculated as the sum of the dichromate-resistant C obtained in the different size-fractions. This sum of all dichromate-resistant C pools can be used as a proxy to estimate contribution of pyrogenic C to the total SOC in the soils studied. The different C fractions isolated by the appropriate combination of methodologies (particle size fractionation, wet chemistry) is proposed as an alternative to obtain the particulate, humus and resistant organic carbon fractions (POC, HOC and ROC, respectively) used in models (e.g. RothC). The developed methodology will help to improve the prediction of SOC dynamics and any impact of climate change on SOC stocks when these contain pyrogenic C.en_US
dc.description.confidentialFALSEen_US
dc.description.place-of-publicationPalmerston North, New Zealanden_US
dc.format.extent? - ? (11)en_US
dc.identifierhttps://www.massey.ac.nz/~flrc/workshops/18/workshop2018.htmlen_US
dc.identifier.citationFarm environmental planning – Science, policy and practice, 2018, (Occasional Report No. 31), pp. ? - ? (11)en_US
dc.identifier.eissn2230-3944en_US
dc.identifier.elements-id441733
dc.identifier.harvestedMassey_Dark
dc.identifier.issn0112-9902en_US
dc.identifier.urihttps://hdl.handle.net/10179/16221
dc.publisherFarmed Landscapes Research Centre (FLRC), Massey Universityen_US
dc.publisher.urihttps://www.massey.ac.nz/~flrc/workshops/18/workshop2018.htmlen_US
dc.relation.isPartOfFarm environmental planning – Science, policy and practiceen_US
dc.relation.urihttp://flrc.massey.ac.nz/workshops/18/Manuscripts/Paper_Calvelo_Pereira_2_2018.pdfen_US
dc.sourceFarm Environment Planning – Science, Policy and Practice 31st Annual FLRC Workshopen_US
dc.titleDISTRIBUTION OF CARBON IN SIZE-FRACTIONS OF A PASTURE SOIL 26 MONTHS AFTER ADDING BIOCHARen_US
dc.typeConference Paper
pubs.notesNot knownen_US
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
pubs.organisational-group/Massey University/College of Sciences/School of Agriculture & Environment
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