Texture and organic carbon contents do not impact amount of carbon protected in Malagasy soils
AUTOR(ES)
Razafimbelo, Tantely, Chevallier, Tiphaine, Albrecht, Alain, Chapuis-Lardy, Lydie, Rakotondrasolo, Fela Nirina, Michellon, Roger, Rabeharisoa, Lilia, Bernoux, Martial
FONTE
Sci. agric. (Piracicaba, Braz.)
DATA DE PUBLICAÇÃO
2013-06
RESUMO
Soil organic carbon (SOC) is usually said to be well correlated with soil texture and soil aggregation. These relations generally suggest a physical and physicochemical protection of SOC within soil aggregates and on soil fine particles, respectively. Because there are few experimental evidences of these relations on tropical soils, we tested the relations of soil variables (SOC and soil aggregate contents, and soil texture) with the amount of SOC physically protected in aggregates on a set of 15 Malagasy soils. The soil texture, the SOC and water stable macroaggregate (MA) contents and the amount of SOC physically protected inside aggregates, calculated as the difference of C mineralized by crushed and intact aggregates, were characterized. The relation between these variables was established. SOC content was significantly correlated with soil texture (clay+fine silt fraction) and with soil MA amount while protected SOC content was not correlated with soil MA amount. This lack of correlation might be attributed to the highest importance of physicochemical protection of SOC which is demonstrated by the positive relation between SOC and clay+fine silt fraction.
Documentos Relacionados
- Aggregation agents and structural stability in soils with different texture and organic carbon contents
- Methods of soil organic carbon determination in Brazilian savannah soils
- Carbon Stocks and Pools in Relation to the Texture of Kaolinitic Soils from the Brazilian East Coast
- How does organic carbon operate in the pore distribution of fine-textured soils?
- TEMPORAL STABILITY OF TOTAL ORGANIC CARBON OF SOILS UNDER DIFFERENT USES IN THE CAATINGA BIOME