Anais do XXXV Congresso Brasileiro de Ciência do Solo

ISOTOPIC COMPOSITION SHIFTS OF SOIL REGARDING SUGARCANE EXPANSION INTO PASTURES AREAS IN SOUTH-CENTRAL BRAZIL

DENER MÁRCIO DA SILVA OLIVEIRA⁽¹⁾; ANDRESSA GONÇALVES CERQUEIRA⁽¹⁾; AMANDA ROCHA FIALLOS⁽¹⁾; AMANDA CORRÊA CAPELLARI⁽²⁾; THALITA PEREIRA LAVORENTI⁽²⁾; CARLOS EDUARDO PELLEGRINO CERRI⁽¹⁾;
1 - ESCOLA SUPERIOR DE AGRICULTURA LUIZ DE QUEIROZ - UNIVERSIDADE DE SÃO PAULO; 2 - ESCOLA DE ENGENHARIA DE PIRACICABA;

The most pervasive scenario of sugarcane expansion in Brazil is into areas previously used as pasture. Changes in soil organic matter (SOM) have raised controversies about the environmental sustainability of biofuels crops. To further elucidate changes in C and N dynamics at superficial and deeper soil layers resulting from sugarcane expansion in South-Central Brazil, we examined the effects of land use change (LUC) on C and N isotopic composition of soil. Soil sampling was carried out in three study sites (LAT_17S; LAT_21S and LAT_23S) and isotope composition of C and N were determined using an elemental analyzer and mass spectrometer. The LUC caused shifts on isotopic composition of soil in areas of South-Central Brazil. In areas undergoing the conversion native vegetation - pasture, alterations in δ15N and δ13C were more noticeable in shallow layers, while in conversion pasture - sugarcane the shifts extend to deeper soil layers.

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