Publications des scientifiques de l'IRD

Silva da M. L., Desjardins Thierry, Sarrazin Max, Melo de V. S., Martins P. F. D., Santos E. R., Carvalho de C. J. R. (2009). Carbon content in amazonian oxisols after forest conversion to pasture. Revista Brasileira de Ciencia do Solo, 33 (6), p. 1603-1611. ISSN 0100-0683.

Titre du document
Carbon content in amazonian oxisols after forest conversion to pasture
Année de publication
2009
Type de document
Article référencé dans le Web of Science WOS:000273736900009
Auteurs
Silva da M. L., Desjardins Thierry, Sarrazin Max, Melo de V. S., Martins P. F. D., Santos E. R., Carvalho de C. J. R.
Source
Revista Brasileira de Ciencia do Solo, 2009, 33 (6), p. 1603-1611 ISSN 0100-0683
Soil plays an important role in the C cycle, and substitution of tropical forest by cultivated land affects C dynamic and stock. This study was developed in an area of expansion of human settlement in the Eastern Amazon, in Itupiranga, State of Para, to evaluate the effects of native forest conversion to Brachiaria brizantha pasture on C contents of a dystrophic Oxisol. Soil samples were collected in areas of native forest (NF), of 8 to 10 year old secondary forest (SF), 1 to 2 year old SF (P1-2), 5 to 7 year old SF (P5-7), and of 10 to 12 year old SF (P10-12), and from under pastures, in the layers 0-2, 2-5 and 5-10 cm, to evaluate C levels and stocks and carry out separation of OM based on particle size. After deforestation, soil density increased to a depth of 5 cm, with greater increase in older pastures. Variation in C levels was greatest in the top soil layer; C contents increased with increasing pasture age. In the layers 2-5 and 5-10 cm, C content proved to be stable for the types of plant cover evaluated. Highest C concentrations were found in the silt fraction; however, C contents were highest in the clay fraction, independent of the plant cover. An increase in C associated with the sand fraction in the form of little decomposed organic residues was observed in pastures, confirming greater sensitivity of this fraction to change in soil use.
Plan de classement
Pédologie [068]
Localisation
Fonds IRD [F B010049257]
Identifiant IRD
fdi:010049257
Contact