Plant Ecology

, Volume 218, Issue 2, pp 225–239 | Cite as

Unraveling the ecosystem functions in the Amazonia–Cerrado transition: evidence of hyperdynamic nutrient cycling

  • Bianca de Oliveira
  • Ben Hur Marimon Junior
  • Henrique A. Mews
  • Marco Bruno X. Valadão
  • Beatriz S. Marimon
Article

Abstract

The contact between savanna and forest in the Amazonia–Cerrado transition zone is characterized by the hyperdynamics of the vegetation (recruitment vs. mortality). However, the related nutrient dynamics under these conditions are not well understood. We determined for the first time the biogeochemical cycles of the vegetation in the zone of transition estimating the litterfall, nutrient input, decomposition rates, and nutrient release in cerradão and cerrado plots. We examine the hypothesis that nutrient cycling is strongly associated with the vegetation dynamics. The litterfall was sampled in 30 traps placed within 1-ha vegetation plots for 2 years. The release of nutrients from the litterfall back to the soil was also estimated using decomposition bags in the two areas. The decomposition rates did not vary between areas, although in the cerradão the input of total biomass (9.27 Mg ha−1 year−1) and total nutrients (219.17 kg ha−1 year−1), the decomposition of the total biomass, and the cycling of most nutrients through litterfall and decomposition were at least twice higher than in the cerrado. These results confirmed the hypothesis concerning the differences between vegetation types in nutrient cycling, suggesting for the first time that the hyperdynamics observed in both vegetations were also reflected in the biogeochemical cycle, particularly in the cerradão. Thus, it is likely that the rapid and effective cycling of nutrients observed in the cerradão might be a key condition guaranteeing the ability of the cerradão to colonize new areas previously occupied by the typical cerrado.

Keywords

Nutrient cycling Leaf litter Cerrado Ecosystem functions Hyperdynamic 

Notes

Acknowledgements

The authors would like to thank the UNEMAT Plant Ecology Laboratory at Nova Xavantina for assistance in the field. This study was financially supported through the following projects: PELD-CNPq403725/2012-7 (UNEMAT), RAINFOR (University of Leeds), GEM (University of Oxford), and CNPq-PPBio (457602/2012-0) (UNEMAT). The authors would also like to thank PROCAD UnB/UNEMAT for financial support; the Coordination for Higher Education Training (CAPES) for the concession of a graduate stipend to Bianca de Oliveira; and the Brazilian National Council for Scientific and Technological Development (CNPq) for research productivity grants (PQ-2) to B.H. Marimon-Junior and B.S. Marimon.

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Bianca de Oliveira
    • 1
  • Ben Hur Marimon Junior
    • 1
  • Henrique A. Mews
    • 1
  • Marco Bruno X. Valadão
    • 1
  • Beatriz S. Marimon
    • 1
  1. 1.Programa de Pós-Graduação em Ecologia e ConservaçãoUniversidade do Estado de Mato Grosso - UNEMATNova XavantinaBrazil

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