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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.)

Nutrient supply modulates species interactions belowground: dynamics and traits of fine roots in mixed plantations of Eucalyptus and Acacia mangium

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Autor(es):
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Bordron, B. [1, 2] ; Germon, A. [3, 4] ; Laclau, J-P [5, 3, 4] ; Oliveira, I. R. [1] ; Robin, A. [5, 4, 6] ; Jourdan, C. [4] ; Paula, R. R. [7] ; Pinheiro, R. C. [3] ; Guillemot, J. [5, 4, 1] ; Goncalves, J. L. M. [1] ; Bouillet, J-P [5, 4, 1]
Número total de Autores: 11
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, ESALQ, Forest Sci Dept, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Loraine, AgroParisTech, INRAE, UMR Silva, F-54000 Nancy - France
[3] Sao Paulo State Univ UNESP, Sch Agr, BR-18610307 Botucatu, SP - Brazil
[4] Univ Montpellier, Eco & Sols, CIRAD, INRA, IRD, Montpellier SupAgro, Montpellier - France
[5] CIRAD, UMR Eco & Sols, F-34060 Montpellier - France
[6] Univ Sao Paulo, ESALQ, Soil Sci Dept, BR-13418900 Piracicaba, SP - Brazil
[7] UFES, Ctr Ciencias Agr & Engn, Alto Univ S-N, BR-29500000 Alegre, ES - Brazil
Número total de Afiliações: 7
Tipo de documento: Artigo Científico
Fonte: PLANT AND SOIL; v. 460, n. 1-2 JAN 2021.
Citações Web of Science: 1
Resumo

Aims Belowground interactions are still poorly understood in mixed-species forests. We investigated the effects of soil fertility on belowground processes in mixed planted forests. Methods The dynamics and traits of Eucalyptus and Acacia mangium fine roots (diameter < 2 mm) in plantations with 50% of each species were studied in a randomized block design established in a nutrient depleted soil. Stands with NPK fertilization applied at planting (F+) were compared to unfertilized stands (F-). Results In the 0-15 cm soil layer, Eucalyptus root mass density (RMD) was higher than Acacia RMD by 50% in F+ and 10% in F-, considering both ages. At 34 months of age, Eucalyptus RMD was 94% higher near Acacia trees than near Eucalyptus trees in F-. In this layer, Eucalyptus specific root length (SRL) was 21% higher than Acacia SRL at 16 months of age and was 10% higher in F- than in F+ at 34 months of age. The cumulative Eucalyptus fine root length production between 16 and 34 months was 66% higher in F- than in F+ in the 0-1 m soil layer. Conclusions Fertilization increased the competition between species and led to a partial exclusion of Acacia fine roots from the nutrient-rich topsoil. Soil exploration by Eucalyptus roots in the vicinity of Acacia trees was higher in F- than in F+, which suggests that unfertilized trees benefited from facilitation through higher soil N availability and direct N transfer from Acacia trees. (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
Modalidade de apoio: Auxílio à Pesquisa - Temático