CHANGES IN PHYSICAL PROPERTIES OF SOILS WITH LAND USE TIME IN THE BRAZILIAN SAVANNA ENVIRONMENT

Autor(es)

Trabaquini, Kleber ^[1] ; Formaggio, Antonio Roberto ^[1] ; Galvao, Lenio Soares ^[1]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais INPE, Div Sensoriamento Remoto, BR-12245970 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: LAND DEGRADATION & DEVELOPMENT; v. 26, n. 4, p. 397-408, MAY 2015.
• Citações Web of Science: 19

Resumo

Soils from central Brazil have been intensively used over the last decades because of the rapid conversion of savannas (Cerrado) into corn/soybean fields. The objective of this work is to study modifications in the physical properties of soils in the Rio Verde watershed, as a function of the land use time for agriculture, determined from classification of Landsat satellite images between 1980 and 2010. Soil samples were collected at surface (0-20cm) and subsurface (20-40cm) horizons for the different classes of land use time (<10, 10-20, 20-30, and >30years). The following physical properties were measured: bulk density (BD), air permeability (K-a), penetration resistance (PR), microporosity (MI), macroporosity (MA), and total porosity (TP). Results showed a strong expansion with time of agriculture that occupied 353% (1980), 374% (1990), 513% (2000), and 609% (2010) of the watershed area. When properties were compared with those from the reference areas (preserved soils under native vegetation), significant differences were observed for all the physical attributes of soils for a land use time higher than 20years. Overall, BD and PR increased with land use time, and the opposite was verified for K-a, MA, and TP. Some physical properties presented values (e.g., 154gcm(-3) for BD and 0.06cm(3)cm(-3) for MA) close to the critical ones reported to affect crop development, but they were not still impacting on local soybean yield. Copyright (c) 2013 John Wiley \& Sons, Ltd. (AU)

• Processo FAPESP: 09/01894-0 - Modelagem ambiental e geotecnologias para avaliação do impacto antrópico e da sustentabilidade da substituição do bioma Cerrado por agricultura intensiva no Brasil Central
• Beneficiário: Kleber Trabaquini
• Linha de fomento: Bolsas no Brasil - Doutorado