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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Partitioning of net primary production in Eucalyptus and Acacia stands and in mixed-species plantations: Two case-studies in contrasting tropical environments

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Autor(es):
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Epron, Daniel [1, 2, 3] ; Nouvellon, Yann [1, 4] ; Mareschal, Louis [1] ; Moreira e Moreira, Rildo [5] ; Koutika, Lydie-Stella ; Geneste, Blandine [1] ; Delgado-Rojas, Juan Sinforiano [5] ; Laclau, Jean-Paul [1, 6] ; Sola, Gael [1] ; de Moraes Goncalves, Jose Leonardo [5] ; Bouillet, Jean-Pierre [5, 1]
Número total de Autores: 11
Afiliação do(s) autor(es):
[1] CIRAD, UMR Ecol Fonct & Biogeochim Sols & Agroecosyst 11, F-34060 Montpellier - France
[2] Univ Lorraine, UMR Ecol & Ecophysiol Forestieres 1137, Fac Sci, F-54500 Vandoeuvre Les Nancy - France
[3] INRA, UMR Ecol & Ecophysiol Forestieres 1137, Ctr Nancy, F-54280 Champenoux - France
[4] Univ Sao Paulo, Dept Ciencias Atmosfer, IAG, BR-05508900 Sao Paulo - Brazil
[5] Univ Sao Paulo, ESALQ, BR-13418900 Piracicaba, SP - Brazil
[6] Univ Estadual Paulista, UNESP, BR-18610307 Botucatu, SP - Brazil
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: FOREST ECOLOGY AND MANAGEMENT; v. 301, n. SI, p. 102-111, AUG 1 2013.
Citações Web of Science: 39
Resumo

The introduction of nitrogen fixing species (NFS) in fast-growing tree plantations is an alternative option to reduce fertilizer inputs. However, the success of mixed-species plantations depends on the balance between positive interactions among species (resulting from facilitation and/or complementarity) and the negative effects of interspecific competition. Using a carbon budget approach and coupling measurements of standing biomass, aboveground litterfall and soil CO2 efflux, we assessed the influence of replacing half of eucalypt trees by Acacia mangium on total belowground carbon flux (TBCF), net primary production (NPP) and its partitioning between above- and belowground growth at two tropical sites in Brazil (Itatinga) and in Congo (Kissoko) exhibiting contrasting climates, edaphic conditions and wood productions. Annual soil CO2 efflux (F-S) was significantly lower in the acacia monocultures than in eucalypt monocultures and mixed-species stands at both sites. Annual F-S was significantly lower at Itatinga compared to Kissoko for all stands while TBCF was significantly lower in the eucalypt stands only. In the eucalypt monocultures we found a significantly lower aboveground NPP (ANPP) and wood production (wood NPP) at Kissoko compared to Itatinga that was almost fully balanced by a significantly higher belowground NPP (BNPP), leading to similar NPP. Similarly, acacia monocultures exhibited significantly higher ANPP and wood NPP at Itatinga than at Kissoko. The mixed-species stands exhibited a significantly lower wood NPP and ANPP than the eucalypt monocultures at the Brazilian site while NPP of the mixture was not significantly different than the average NPP of the two monocultures. At the Congolese site, NPP of the mixture was significantly higher than the average NPP of the two monocultures. NPP was similar in the mixed-species stand and the eucalypt monoculture with a significantly lower partitioning of NPP to belowground production, leading to a one third higher wood biomass at harvest in the mixed-species stand. A positive effect of growing eucalypts with the nitrogen fixing acacia trees on stand wood production occurred at Kissoko but not at Itatinga. Mixed-species plantations with NFS can be advocated at sites where the productive gains resulting from nitrogen fixation are not compromised by other resource limitations. (c) 2012 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 10/16623-9 - Intensificação ecológica de plantações de eucaliptos pela associação com espécies leguminosas arbóreas fixadoras de nitrogênio
Beneficiário:José Leonardo de Moraes Gonçalves
Linha de fomento: Auxílio à Pesquisa - Temático