Biological functioning of Brazilian Cerrado soils under different vegetation types |
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Authors: | Ieda de Carvalho Mendes Marcelo Ferreira Fernandes Guilherme Montandon Chaer Fábio Bueno dos Reis Junior |
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Institution: | 1. Embrapa - Centro de Pesquisa Agropecuária dos Cerrados, Caixa Postal 08223, Planaltina, DF, Brazil, 73310-970 2. Embrapa Tabuleiros Costeiros, Av. Beira Mar 3250, Aracaju, SE, Brazil, 49025-040 3. Embrapa Agrobiologia, Rodovia BR 465, Km7, Seropédica, RJ, Brazil, 23890-000
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Abstract: | Aims Over a 2?year period, we compared the soil biological functioning (SBF) of Cerrado physiognomies ranging from grassland-savannic to forest formations, sampling in the middle of the dry and rainy seasons. Methods Soil samples were collected at two depths (0 to 5?cm and 5 to 20?cm) under the following physiognomies: Campo Sujo, Cerrado Ralo, Cerrado sensu stricto, Cerrad?o and Mata de Galeria. The SBF was represented by the simultaneous analyses of microbial biomass carbon, soil basal respiration and the activity of enzymes linked to the C, P and S cycles (β-glucosidase, acid phosphatase and arylsulfatase, respectively). Results The results demonstrated that Cerrado physiognomies are a major determinant of SBF patterns. The forest-like physiognomies (Mata de Galeria and Cerrad?o) presented the highest biomass and activity compared to the grassland (Campo Sujo) and savanna physiognomies (Cerrado Ralo and Cerrado sensu stricto). These differences were more evident in the topsoil layer (0 to 5?cm), and the seasonal effect on the SBF of the Mata de Galeria and Cerrad?o was more pronounced than on the other physiognomies. Conclusions These results provide a benchmark for evaluating changes in SBF and related processes in Cerrado areas due to shifts toward agriculture and cattle production. |
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