Crescimento, nutrição e fixação biologica de nitrogênio em plantios mistos de eucalipto e leguminosas arboreas

De Freitas Coelho Selma Regina, De Moraes Gonçalves Jose Leonardo, De Miranda Mello Sergio Luis, Moreira e Moreira Rildo, Da Silva Eduardo Vinicius, Laclau Jean-Paul. 2007. Crescimento, nutrição e fixação biologica de nitrogênio em plantios mistos de eucalipto e leguminosas arboreas. Pesquisa Agropecuária Brasileira, 42 (6) : 759-768.

https://doi.org/10.1590/S0100-204X2007000600001

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Titre anglais : Growth, nutrition and biological fixation of nitrogen in mixed-species plantations of eucalyptus with leguminous trees

Résumé : The objective of this work was to assess interactions between species on the above and belowground growth, nitrogen uptake and biological nitrogen fixation (BNF) in mixed stands of Eucalyptus grandis and native leguminous N2-fixing trees. A complete randomized block design was installed with seven treatments and three blocks. Within the lines of the E. grandis seedlings, native leguminous N2-fixing trees - Peltophorum dubium, Inga sp., Mimosa scabrella, Acacia polyphylla, Mimosa caesalpiniaefolia - and one exotic leguminous plant, Acacia mangium, were intercropped. E. grandis was also solely planted. Mimosa scabrella and A. mangium were the legume trees that presented the highest growth. Although E. grandis showed a lower growth when combined with M. scabrella, this mixed-species stand exhibited the highest biomass accumulation. Eucalyptus grandis fine root densities (FRD) were 6-20 times higher than the FRD of the leguminous species in the upper soil layer (0-10 cm) 24 months after planting. The FRD of M. scabrella and M. caesalpiniaefolia in the 30-50 cm soil layer was higher than in the 10-30 cm layer. The [delta]'5N values of M. scabrella indicated that 90% of stocked N is derived from BNF.

Mots-clés Agrovoc : Eucalyptus grandis, Mimosa scabrella, Acacia

Mots-clés géographiques Agrovoc : Sao Paulo

Mots-clés complémentaires : Mimosa caesalpiniaefolia

Classification Agris : F62 - Physiologie végétale - Croissance et développement
P34 - Biologie du sol

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

De Freitas Coelho Selma Regina, USP (BRA)
De Moraes Gonçalves Jose Leonardo, USP (BRA)
De Miranda Mello Sergio Luis, USP (BRA)
Moreira e Moreira Rildo, USP (BRA)
Da Silva Eduardo Vinicius, USP (BRA)
Laclau Jean-Paul, CIRAD-PERSYST-UPR Ecosystèmes de plantations (BRA) ORCID: 0000-0002-2506-214X