Cropping systems, carbon sequestration and erosion in Brazil, a review
| Autor: | Mariana Pavei, Martial Bernoux, Tantely Razafimbelo, Eric Scopel, Marcos Siqueira Neto, Eleanor Milne, Carlos Eduardo Pellegrino Cerri, Anne-Sophie Perrin, Carlos Clemente Cerri, Marisa de Cássia Piccolo, Didier Blavet, Aurélie Metay |
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| Přispěvatelé: | Revues Inra, Import |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
[SDV.SA]Life Sciences [q-bio]/Agricultural sciences
Semis direct Soil biodiversity F08 - Systèmes et modes de culture Stockage 010501 environmental sciences Carbon sequestration 01 natural sciences stocks Non-travail du sol Soil management 2. Zero hunger [SDV.EE]Life Sciences [q-bio]/Ecology environment F07 - Façons culturales [SDV.SA] Life Sciences [q-bio]/Agricultural sciences 04 agricultural and veterinary sciences 6. Clean water fluxes séquestration du carbone Pratique culturale [SDV.EE] Life Sciences [q-bio]/Ecology environment greenhouse gas P01 - Conservation de la nature et ressources foncières Gaz à effet de serre Brazil P33 - Chimie et physique du sol Carbone Environmental Engineering no-tillage No-till farming no tillage Soil retrogression and degradation 0105 earth and related environmental sciences Sol Érosion mulch Soil organic matter Soil carbon 15. Life on land Soil structure Agronomy 13. Climate action 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Système de culture Plante de culture Agronomy and Crop Science |
| Zdroj: | Agronomy for Sustainable Development Sustainable agriculture: volume 1 Agronomy for Sustainable Development, Springer Verlag/EDP Sciences/INRA, 2006, 26 (1), pp.1-8 Sustainable Agriculture ISBN: 9789048126651 |
| ISSN: | 1774-0746 1773-0155 |
| Popis: | International audience; Soils represent a large carbon pool, approximately 1500 Gt, which is equivalent to almost three times the quantity stored in terrestrial biomass and twice the amount stored in the atmosphere. Any modification of land use or land management can induce variations in soil carbon stocks, even in agricultural systems that are perceived to be in a steady state. Tillage practices often induce soil aerobic conditions that are favourable to microbial activity and may lead to a degradation of soil structure. As a result, mineralisation of soil organic matter increases in the long term. The adoption of no-tillage systems and the maintenance of a permanent vegetation cover using Direct seeding Mulch-based Cropping system or DMC, may increase carbon levels in the topsoil. In Brazil, no-tillage practices (mainly DMC), were introduced approximately 30 years ago in the south in the Paraná state, primarily as a means of reducing erosion. Subsequently, research has begun to study the management of the crop waste products and their effects on soil fertility, either in terms of phosphorus management, as a means of controlling soil acidity, or determining how manures can be applied in a more localised manner. The spread of no-till in Brazil has involved a large amount of extension work. The area under no-tillage is still increasing in the centre and north of the country and currently occupies ca. 20 million hectares, covering a diversity of environmental conditions, cropping systems and management practices. Most studies of Brazilian soils give rates of carbon storage in the top 40 cm of the soil of 0.4 to 1.7 t C ha-1 per year, with the highest rates in the Cerrado region. However, caution must be taken when analysing DMC systems in terms of carbon sequestration. Comparisons should include changes in trace gas fluxes and should not be limited to a consideration of carbon storage in the soil alone if the full implications for global warming are to be assessed. |
| Databáze: | OpenAIRE |
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