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Plant and Soil

, Volume 424, Issue 1–2, pp 203–220 | Cite as

Consequences of mixing Acacia mangium and Eucalyptus grandis trees on soil exploration by fine-roots down to a depth of 17 m

  • Amandine Germon
  • Iraê Amaral Guerrini
  • Bruno Bordron
  • Jean-Pierre Bouillet
  • Yann Nouvellon
  • José Leonardo de Moraes Gonçalves
  • Christophe Jourdan
  • Ranieri Ribeiro Paula
  • Jean-Paul Laclau
Original Paper

Abstract

Background and aims

Fine-root functioning is a major driver of plant growth and strongly influences the global carbon cycle. While fine-root over-yielding has been shown in the upper soil layers of mixed-species forests relative to monospecific stands, the consequences of tree diversity on fine-root growth in very deep soil layers is still unknown. Our study aimed to assess the consequences of mixing Acacia mangium and Eucalyptus grandis trees on soil exploration by roots down to the water table at 17 m depth in a tropical planted forest.

Method

Fine roots (diameter < 2 mm) were sampled in a randomized block design with three treatments: monospecific stands of Acacia mangium (100A), Eucalyptus grandis (100E), and mixed stands with 50% of each species (50A50E). Root ingrowth bags were installed at 4 depths (from 0.1 m to 6 m) in the three treatments within three different blocks, to study the fine-root production over 2 periods of 3 months.

Results

Down to 17 m depth, total fine-root biomass was 1127 g m−2 in 50A50E, 780 g m−2 in 100A and 714 g m−2 in 100E. Specific root length and specific root area were 110–150% higher in 50A50E than in 100A for Acacia mangium trees and 34% higher in 50A50E than in 100E for Eucalyptus grandis trees. Ingrowth bags showed that the capacity of fine roots to explore soil patches did not decrease down to a depth of 6 m for the two species.

Conclusions

Belowground interactions between Acacia mangium and Eucalyptus grandis trees greatly increased the exploration of very deep soil layers by fine roots, which is likely to enhance the uptake of soil resources. Mixing tree species might therefore increase the resilience of tropical planted forests through a better exploration of deep soils.

Keywords

Plantation Forest Deep root Fine-root density Root traits Diversity Over-yielding Brazil 

Notes

Acknowledgements

We are truly grateful to Daise Silva Ferreira for the huge work carried out in the field and in the laboratory. We would like to thank Agence national de la recherche (Intens&fix Project ANR-2010-STRA-004-03) and São Paulo Research foundation (FAFESP, projects 2015/24911-8 and 2011/20510-8) for their financial support. The study belongs to the SOERE F-ORE-T, which is supported annually by Ecofor, Allenvi and the French National Research Infrastructure ANAEE-F (http://www.anaee-france.fr/fr/). We are grateful of the technical support of Rildo M. Moreira and the staff of Itatinga Research Station (ESALQ/USP) as well as Eder Araujo da Silva (http://www.floragroapoio.com.br).

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Amandine Germon
    • 1
    • 2
  • Iraê Amaral Guerrini
    • 1
  • Bruno Bordron
    • 3
  • Jean-Pierre Bouillet
    • 2
    • 3
    • 4
  • Yann Nouvellon
    • 2
    • 3
    • 4
  • José Leonardo de Moraes Gonçalves
    • 3
  • Christophe Jourdan
    • 2
    • 4
  • Ranieri Ribeiro Paula
    • 3
    • 5
  • Jean-Paul Laclau
    • 1
    • 2
    • 3
    • 4
  1. 1.Departamento de Solos e Recursos AmbientaisUniversidade Estadual Paulista ‘Júlio de Mesquita Filho’BotucatuBrazil
  2. 2.Eco&Sols, INRA, CIRAD, IRD, Montpellier SupAgroUniversity of MontpellierMontpellierFrance
  3. 3.ESALQ, Universidade de São PauloPiracicabaBrazil
  4. 4.CIRAD, Eco&SolsMontpellierFrance
  5. 5.Departamento de Ciências Florestais e da MadeiraUniversidade Federal do Espírito SantoJerônimo MonteiroBrazil

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