Carbon stock and its compartments in a subtropical oxisol under long-term tillage and crop rotation systems

dc.contributor.authorde Campos, B. H. C.en
dc.contributor.authorAmado, T. J. C.en
dc.contributor.authorBayer, C.en
dc.contributor.authorda S. Nicoloso, R.en
dc.contributor.authorFiorin, J. E.en
dc.contributor.departmentSustainable Agriculture and Natural Resource Management (SANREM) Knowledgebaseen
dc.coverage.spatialCruz Altaen
dc.coverage.spatialSouthern Brazilen
dc.coverage.temporal1985 - 2004en
dc.date.accessioned2016-04-19T20:29:20Zen
dc.date.available2016-04-19T20:29:20Zen
dc.date.issued2011en
dc.description.abstractSoil organic matter (SOM) plays a crucial role in soil quality and can act as an atmospheric C-CO2 sink under conservationist management systems. This study aimed to evaluate the long-term effects (19 years) of tillage (CT-conventional tillage and NT-no tillage) and crop rotations (R0 - monoculture system, R1 - winter crop rotation, and R2 - intensive crop rotation) on total, particulate and mineral-associated organic carbon (C) stocks of an originally degraded Red Oxisol in Cruz Alta, RS, Southern Brazil. The climate is humid subtropical Cfa 2a (Köppen classification), the mean annual precipitation 1,774 mm and mean annual temperature 19.2°C. The plots were divided into four segments, of which each was sampled in the layers 0-0.05, 0.05-0.10, 0.10-0.20, and 0.20-0.30 m. Sampling was performed manually by opening small trenches. The SOM pools were determined by physical fractionation. Soil C stocks had a linear relationship with annual crop C inputs, regardless of the tillage systems. Thus, soil disturbance had a minor effect on SOM turnover. In the 0-0.30 m layer, soil C sequestration ranged from 0 to 0.51 Mg ha-1 yr-1, using the CT R0 treatment as base-line; crop rotation systems had more influence on soil stock C than tillage systems. The mean C sequestration rate of the cropping systems was 0.13 Mg ha-1 yr-1 higher in NT than CT. This result was associated to the higher C input by crops due to the improvement in soil quality under long-term no-tillage. The particulate C fraction was a sensitive indicator of soil management quality, while mineral-associated organic C was the main pool of atmospheric C fixed in this clayey Oxisol. The C retention in this stable SOM fraction accounts for 81 and 89% of total C sequestration in the treatments NT R1 and NT R2, respectively, in relation to the same cropping systems under CT. The highest C management index was observed in NT R2, confirming the capacity of this soil management practice to improve the soil C stock qualitatively in relation to CT R0. The results highlighted the diversification of crop rotation with cover crops as a crucial strategy for atmospheric C-CO2 sequestration and SOM quality improvement in highly weathered subtropical Oxisols. (Cab Abstracts)en
dc.format.mimetypetext/htmlen
dc.identifier5264en
dc.identifier.citationRevista Brasileira de Ciência do Solo 35(3): 805 - 817en
dc.identifier.doihttps://doi.org/10.1590/S0100-06832011000300016en
dc.identifier.issn0100-0683en
dc.identifier.other5264_Campos_Carbon_stock_and_its_compartments.pdfen
dc.identifier.urihttp://hdl.handle.net/10919/69912en
dc.language.isoen_USen
dc.publisherSociedade Brasileira de Ciência do Soloen
dc.relation.urihttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300016&lng=en&nrm=iso&tlng=enen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.holderAll the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectSoil organic matteren
dc.subjectCarbon sequestrationen
dc.subjectSoil managementen
dc.subjectConservation tillageen
dc.subjectRed oxisolen
dc.subjectCruz altaen
dc.subjectBrazilen
dc.subjectNo-tillen
dc.subjectConventional tillageen
dc.subjectField Scaleen
dc.titleCarbon stock and its compartments in a subtropical oxisol under long-term tillage and crop rotation systemsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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