Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 572, Issue -, Pages 157-168Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2016.07.177
Keywords
Biogeochemical; Environmental impact; Flooding; Land use; Terra firme; Rainforest
Categories
Funding
- Brazilian Government through Instituto Chico Mendes de Conservacao da Biodiversidade and Reserva Biologica do Uatuma (ICMBio/REBIO-Uatuma)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (MEC/CAPES)
- Matheus Bastos e Joelson Nogueira
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Extensive areas in the Brazilian Amazon have been flooded for the construction of hydroelectric dams. However, the water regime of these areas affects the dynamics of igarapes (streams) in adjacent terra firme (upland forests). When the reservoirs are filled, the water levels of streams rise above the normal levels and upland bank forests are flooded. We investigated how this flooding affects the litterfall and nutrient input in the upland forests upstream of a hydroelectric dam reservoir in the Central Amazonia. When the reservoir was filled, the forests were flooded and produced more than twice the litter (8.80 Mg . ha(-1) yr(-1)), with three times more leaves (6.36 Mg . ha(-1) yr(-1)) than when they were not flooded (4.20 and 1.92 Mg . ha(-1) yr(-1), respectively). During flooding, the decomposition rate was four times lower in flooded forests (0.328 g . g(-1) yr(-1)) than in control forests (1.460 g . g(-1) yr(-1)). Despite this, the flooding did not favor litter or nutrient accumulation. Therefore, dam construction changes the organic matter and nutrient cycling in upland Amazon rainforests. This may influence the important role that they play in organic matter dynamics and could have consequences for the regional carbon balance and, ultimately, global climate. (C) 2016 Elsevier B.V. All rights reserved.
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