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Effects of experimental fires on litter decomposition in a seasonally dry Amazonian forest

Published online by Cambridge University Press:  08 October 2009

Juliana M. Silveira ,
Jos Barlow ,
Alex V. Krusche ,
Kate H. Orwin ,
Jennifer K. Balch  and
Paulo Moutinho
Juliana M. Silveira*
Affiliation:
Universidade Federal de Lavras-UFLA, Minas Gerais, 37200-000, Brazil Museu Paraense Emilio Goeldi-MPEG, Belém, Pará, 66017-970, Brazil
Jos Barlow
Affiliation:
Museu Paraense Emilio Goeldi-MPEG, Belém, Pará, 66017-970, Brazil Lancaster University, Lancaster Environment Centre, LA1 4YQ, UK
Alex V. Krusche
Affiliation:
Centro de Energia Nuclear na Agricultura – CENA, São Paulo, 13400-970, Brazil
Kate H. Orwin
Affiliation:
Lancaster University, Lancaster Environment Centre, LA1 4YQ, UK
Jennifer K. Balch
Affiliation:
Woods Hole Research Center, Falmouth, USA Yale University, School of Forestry and Environmental Studies, New Haven, USA
Paulo Moutinho
Affiliation:
Instituto de Pesquisa Ambiental da Amazônia – IPAM, 71503-505 Brasília, Brazil
*
1Corresponding author. Email: [email protected]
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Abstract:

Litter decomposition is a fundamental process for nutrient cycling but we have a limited understanding of this process in disturbed tropical forests. We studied litter decomposition over a 10-mo period in a seasonally dry Amazon forest in Mato Grosso, Brazil. The study plots (50 ha each) included unburned forest (UF), once-burned (BF1) and forest burned annually for 3 y (BF3). We measured understorey density, litter depth, canopy openness, temperature and relative humidity in the plots. Decomposition experiments took place using 720 litterbags filled with approximately 10 g of natural abscised oven-dried leaves. To test the effects of fire on soil meso- and macrofauna, the litterbags had either a fine (2 mm) or coarse (with 1-cm holes in side) mesh size. Litterbags were collected and reweighed 2, 4, 6 and 8 mo after being placed on the forest floor. All forest structure variables were significantly different across plots: BF3 was hotter, less humid, had the highest degree of canopy openness, lowest understorey density and the shallowest litter depth. Litter decomposition (mass loss) was similar in the once-burned and unburned plots, but declined more slowly in BF3. In addition, decomposition was slower in fine-mesh litterbags than coarse-mesh litterbags in BF3, but there was no difference between mesh sizes in BF1 and UF. It is likely that changes in forest structure and microclimate explain the lower decomposition rates in BF3. These results show the importance of recurrent fires, but suggest that single understorey fires may not have long-term negative effects on some ecological processes in seasonally dry Amazonian forests.

Keywords

AmazonarthropodsBrazildecompositionfireorganic matter
Type
Research Article
Information
Journal of Tropical Ecology , Volume 25 , Issue 6 , November 2009 , pp. 657 - 663
Copyright
Copyright © Cambridge University Press 2009

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