Ecosystem productivity and carbon cycling in intact and annually burnt forest at the dry southern limit of the Amazon rainforest (Mato Grosso, Brazil)

Background: The impact of fire on carbon cycling in tropical forests is potentially large, but remains poorly quantified, particularly in the locality of the transition forests that mark the boundaries between humid forests and savannas. Aims: To present the first comprehensive description of the im...

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Vydáno v:	Plant ecology & diversity Ročník 7; číslo 1-2; s. 25 - 40
Hlavní autoři:	Rocha, Wanderley, Metcalfe, Daniel B., Doughty, Chris E., Brando, Paulo, Silvério, Divino, Halladay, Kate, Nepstad, Daniel C., Balch, Jennifer K., Malhi, Yadvinder
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Abingdon Taylor & Francis 01.01.2014 Taylor & Francis Ltd
Témata:	allocation Amazonia Brazil Carbon Carbon cycle carbon cycling Climate change CUE Dry forests Earth and Related Environmental Sciences Ecosystems Environmental impact fire experiment Forest Science Forests Geovetenskap och relaterad miljövetenskap GPP Natural Sciences Naturgeografi Naturvetenskap NPP Physical Geography primary productivity Productivity Rainforests savannas Skogsvetenskap soil Soil fertility Tanguro Tropical forests tropical seasonally dry rainforest understory Brazil Amazonia
ISSN:	1755-0874, 1755-1668, 1755-1668
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Shrnutí:	Background: The impact of fire on carbon cycling in tropical forests is potentially large, but remains poorly quantified, particularly in the locality of the transition forests that mark the boundaries between humid forests and savannas. Aims: To present the first comprehensive description of the impact of repeated low intensity, understorey fire on carbon cycling in a semi-deciduous, seasonally dry tropical forest on infertile soil in south-eastern Amazonia. Methods: We compared an annually burnt forest plot with a control plot over a three-year period (2009-2011). For each plot we quantified the components of net primary productivity (NPP), autotrophic (R a ) and heterotrophic respiration (R h ), and estimated total plant carbon expenditure (PCE, the sum of NPP and R a ) and carbon-use efficiency (CUE, the quotient of NPP/PCE). Results: Total NPP and R a were 15 and 4% lower on the burnt plot than on the control, respectively. Both plots were characterised by a slightly higher CUE of 0.36-0.39, compared to evergreen lowland Amazon forests. Conclusions: These measurements provide the first evidence of a distinctive pattern of carbon cycling within this transitional forest. Overall, regular understorey fire is shown to have little impact on ecosystem-level carbon fluxes.
Bibliografie:	SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	1755-0874 1755-1668 1755-1668
DOI:	10.1080/17550874.2013.798368