Biomassa e atividade microbiana de solo sob vegetação nativa e diferentes sistemas de manejos

• Published in: Acta scientiarum. Agronomy Vol. 33; no. 2; p. 341
• Main Authors: Alves, Tatiane Dos Santos, Campos, Lizia Lenza, Elias Neto, Nicolau, Matsuoka, Marcia, Loureiro, Maria Fatima
• Format: Journal Article
• Language: English; Spanish
• Published: Universidade Estadual de Maringa 11.04.2011
• ISSN: 1679-9275; 1807-8621
• DOI: 10.4025/actasciagron.v33i2.4841

Biomass and soil microbial activity under native vegetation and different soil managements. The purpose of the present study is to evaluate the influence of different handling systems, the microbial population and its activity. To that end, soil samples were collected in October 2006 and March 2007, at Fazenda Sereno in the city of Jaciara, Mato Grosso State. The samples were removed at 0-10 cm deep with four replications in five areas with different handling systems: agriculture-livestock integration, corn/soy fields, pastures, native vegetation, and native vegetation under recovery. The method of Chloroform Fumigation-Incubation (CFI) was used to evaluate microbial biomass carbon (MBC) and microbial respiration (MR). The qC[O.sub.2] was obtained through the relationship between MR and MBC. The averages were compared through the Scott-Knott test at 5%. During the analyses, it was observed that the different agricultural practices substantially affect the soil, causing disturbances in the microbial community, which may influence the biogeochemical processes occurring on the soil. The data obtained also makes it possible to conclude that: in the agriculture-livestock integration and pasture systems, the microbial population is influenced by collection times. In this work, in the field-livestock integration system, the microbial activity is constant at the different collection times and management systems influence the metabolic activity of microorganisms in the soil. Keywords: soil microorganisms, chloroform fumigation-incubation, bioindicators, metabolic quotient, agriculture-livestock integration. O presente trabalho tem como objetivo avaliar a influencia de diferentes sistemas de manejos, a populacao microbiana e sua atividade. Para tal, foram coletadas, em outubro de 2006 e marco de 2007, amostras de solo na Fazenda Sereno no Municipio de Jaciara, Estado do Mato Grosso. Retirou-se amostras de solo na profundidade de 0-10 cm, com quatro repeticoes em cinco areas com diferentes sistemas de manejos: integracao lavoura-pecuaria, lavoura de milho/soja, pastagens, vegetacao nativa e vegetacao nativa em recuperacao. Para avaliar o carbono da biomassa microbiana (CBM) e a respiracao microbiana (RM) foi utilizado o metodo do Cloroformio Fumigacao-Incubacao (CFI). Ja o qC[O.sub.2] foi obtido pela relacao entre a RM e o CBM. As medias foram comparadas pelo teste de Scott-Knott a 5%. No decorrer das analises, pode-se observar que as diferentes praticas agricolas afetam fortemente o solo causando disturbios na comunidade microbiana que podem, por sua vez, influenciar os processos biogeoquimicos que nele ocorrem. Os dados obtidos permitem, ainda, concluir que: nos sistemas Integracao lavoura-pecuaria e pecuaria a populacao microbiana e influenciada pelas epocas de coletas. Nesse trabalho, no sistema Integracao lavoura-pecuaria a atividade microbiana e constante nas diferentes epocas de coleta e os diferentes sistemas de manejos influenciam a atividade metabolica dos microrganismos presentes no solo. Palavras-chave: microrganismos do solo, cloroformio fumigacao-incubacao, bioindicadores, quociente metabolico, integracao lavoura-pecuaria.