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Influence of trees on soil nutrient pools in a silvopastoral system in the Brazilian Savannah

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Abstract

Silvopastoral systems (SPS) have been suggested as an approach to reduce pasture degradation and, consequently, reduce the deforestation of new areas in the Brazilian cerrado (savanna). This study assessed the contribution of trees to soil fertility in a silvopastoral system in Lagoa Santa, Minas Gerais State, Brazil, 19° 35′ 36″ S, 43° 51′ 56″ W; altitude 747 m. The SPS has developed since 1984, through the use of natural regeneration of the native species Zeyheria tuberculosa Vell. Bur., with a density of 160 trees ha−1. The forage component of the system was Brachiaria brizantha cv. Marandu. The control treatment was a pasture adjacent to SPS with the same forage but without the influence of trees. In 2005, the litterfall of trees (leaves, fruits, and stems) was collected monthly, and the dry matter yield and nutrient content were measured. Soil profile samples were collected in February 2006. The litterfall of trees represented considerable inputs of nitrogen (N), potassium (K), and calcium (Ca2+). In the soil, organic matter (OM) and K reduced with depth. At this planting density, this tree species contributed mainly to amelioration of soil acidity, in the 0–2 cm layer and/or in the profile as a whole. In contrast, there were no significant differences in N, P, and K content of the control and SPS soil. This can be related to the high C/N and lignin/N ratios of the litter inputs. Agroforestry systems are complex and the site specific interactions among the components (tree, forage, and animal) must be understood to develop locally adapted systems and optimize productive efficiency. Consequently simple prescriptions for the implementation of SPS by land managers are unlikely.

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Acknowledgements

The authors gratefully acknowledge Drs. Yolanda Viana, Drs. Virgílio Viana (owners), and Sr. Luis (manager) of the Grota Funda farm for the use of farm facilities and personnel to conduct the trial, all the lab staff and the colleagues of Guilherme Rocha Moreira and Luciano Fernandes de Sousa for their assistance, Professor Gilberto Fernandes Corrêa and Professor Elias Nascentes Borges for their important suggestions, and Professor Ivan Sampaio for his kind review of the manuscript. This research was part of the first author’s MSc dissertation and was supported by CAPES, FAPEMIG, and CNPq.

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Authors and Affiliations

  1. Federal University of Minas Gerais, Veterinarian School, Cx.P. 567, 30123-970, Belo Horizonte, MG, Brazil

    Guilherme Lanna Reis, Ângela Maria Quintão Lana, Iran Borges & Talmir Quinzeiro Neto

  2. Ezequiel Dias Foundation (FUNED), Rua Conde Pereira Carneiro, 80, 30 510 010, Belo Horizonte, MG, Brazil

    Rogério Martins Maurício

  3. Federal University of Uberlândia, Av. Amazonas, s/n – Bloco 4C, Sala 102, Campus Umuarama, Uberlândia, MG, Brazil

    Regina Maria Quintão Lana

  4. Federal University of Minas Gerais, Institute of Biology Sciences, Cx.P. 567, 30123-970, Belo Horizonte, MG, Brazil

    Rodrigo Matta Machado

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  1. Guilherme Lanna Reis
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  2. Ângela Maria Quintão Lana
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  3. Rogério Martins Maurício
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  4. Regina Maria Quintão Lana
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  5. Rodrigo Matta Machado
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  6. Iran Borges
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  7. Talmir Quinzeiro Neto
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Correspondence to Guilherme Lanna Reis.

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Responsible Editor: Elizabeth (Liz) A. Stockdale.

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Reis, G.L., Lana, Â.M.Q., Maurício, R.M. et al. Influence of trees on soil nutrient pools in a silvopastoral system in the Brazilian Savannah. Plant Soil 329, 185–193 (2010). https://doi.org/10.1007/s11104-009-0144-5

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