Anais do XXXIV Congresso Brasileiro de Ciência do Solo

BACTERIA AND DENITRIFYING COMMUNITIES AS PREDICTORS OF LONG-TERM LAND-USE CHANGE IN BRAZILIAN SUB-TROPICS

DENNIS GOSS DE SOUZA⁽¹⁾; CLOVIS DANIEL BORGES⁽²⁾; PAULA CRUZ LOPES⁽²⁾; MARIA JULIA DE LIMA BROSSI⁽²⁾; DILMAR BARETTA⁽³⁾; SIU MUI TSAI⁽²⁾;
1 - UNIVERSIDADE DE SÃO PAULO - USP; 2 - USP; 3 - UDESC;

This study aimed to evaluate size of total Bacteria and denitrifying community through quantitative-PCR and diversity of soil Bacteria through T-RFLP, along seasons and gradient of land-use change. Size of all communities evaluated varied between winter and summer and also varied along LUC. Richness increased in summer with average of 117 phylotypes against 80 in winter and also increased as more intensified as LUC in summer. Even with less Richness, Forest was more diverse than other land-use systems in winter and equally diverse in summer, which points to a simplification of total Bacteria community the extent to which land-use became more intensified. There was an increase in relative frequency of the most common phylotypes as more intensified as land-use. Factors that most significantly shaped variability of Bacteria and denitrifying sizes were season, clay content and soil acidity. Bacteria structure was most significantly affected by season, location and LUC.

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