Soil biological attributes in pastures of different ages in a crop-livestock integrated system

Pesquisa Agropecuária Brasileira

Luciano Cavalcante Muniz¹  Beata Emöke Madari¹  José Benedito De Freitas Trovo¹  Ilka South De Lima Cantanhêde¹  Pedro Luiz Oliveira De Almeida Machado¹  Tarcísio Cobucci¹  Aldi Fernandes De Souza França² 

[1] ,Universidade Federal de Goiás Escola de Veterinária Goiânia GO

关键词: metabolic quotient;    microbial biomass carbon;    microbial quotient;    soil respiration;    quociente metabólico;    carbono da biomassa microbiana;    quociente microbiano;    respiração do solo;   

DOI  :  10.1590/S0100-204X2011001000021

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the effect of the pasture (Urochloa brizantha) component age on soil biological properties, in a crop-livestock integrated system. The experiment was carried out in a Brazilian savannah (Cerrado) area with 92 ha, divided into six pens of approximately 15 ha. Each pen represented a different stage of the pasture component: formation, P0; one year, P1; two years, P2; three years, P3; and final with 3.5 years, Pf. Samples were taken in the 0-10 cm soil depth. The soil biological parameters - microbial biomass carbon (MBC), microbial biomass respiration (C-CO2), metabolic quotient (qCO2), microbial quotient (q mic), and total organic carbon (TOC) - were evaluated and compared among different stages of the pasture, and between an adjacent area under native Cerrado and another area under degraded pasture (PCD). The MBC, q mic and TOC increased and qCO2 reduced under the different pasture stages. Compared to PCD, the pasture stages had higher MBC, q mic and TOC, and lower qCO2. The crop-livestock integrated system improved soil microbiological parameters and immobilized carbon in the soil in comparison to the degraded pasture.

【 授权许可】

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