Anais do XXXV Congresso Brasileiro de Ciência do Solo

EUCALYPTUS SP. HARVEST RESIDUES: IMPACTS ON THE DYNAMICS OF MICROBIAL COMMUNITY OF SOILS IN PAMPA BIOME

GABRIEL WILLIAM DIAS FERREIRA⁽¹⁾; FERNANDA CRISTINA CAPARELLI DE OLIVEIRA⁽¹⁾; ALINE DE ALMEIDA VASCONCELOS⁽²⁾; JENNIFER A J DUNGAIT⁽³⁾; IVO RIBEIRO DA SILVA⁽¹⁾; ELIAS FRANK ARAÚJO⁽⁴⁾;
1 - UNIVERSIDADE FEDERAL DE VIÇOSA; 2 - -; 3 - NORTH WYKE ROTHAMSTED RESEARCH; 4 - CMPC CELULOSE RIOGRANDENSE;

The composition and activity of soil microbial community are among the most important forces driving SOM mineralization process. The use of isotopic techniques on biomarkers of soil microbial community allows a linking between microbial community structure and your specific role on the process of SOM formation. The aim of this study was to assess the succession of soil community, through phospholipid fatty acids (PLFA) combined with 13C-PLFA, mediating the decomposition of Eucalyptus sp. harvest residue on soil of Pampa Biome. The treatments were arranged as a randomized block design with four field replications. Treatments consisted of 3 residue management (no residue added or addition of residue without bark or with bark presence) and 2 levels of N fertilization (0 and 200 kg ha-1). Soil samples were analysed in three different periods of residue decomposition: 3, 6 and 12 months. We used Principal Components Analysis (PCA) to elucidate PLFA and δ13C-PLFA groups overtime. We found 24 PLFAs which account for an average concentration of 1.42 µg C-PLFA g 1 of dry soil. The mean of δ13C-PLFA was -21.7 ‰. Differences on soil microbial community concentration caused by eucalyptus harvest residue were time dependent. Fungi was the most responsible for residue decomposition and G+ve and Actino less ones.

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