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Annals of Forest Science

, Volume 70, Issue 3, pp 229–239 | Cite as

Distribution of coarse and fine roots of Theobroma cacao and shade tree Inga edulis in a cocoa plantation

  • Pekka Nygren
  • Humberto A. Leblanc
  • Miaoer Lu
  • Cristino A. Gómez Luciano
Original Paper

Abstract

• Context

Cocoa (Theobroma cacao L.) is often cultivated below legume shade trees, but root interactions between the species are not well known. The first step in understanding these interactions is the description of spatial root system distribution of cocoa and shade trees.

• Aims

We studied the root distributions of cocoa and Inga edulis Mart. (inga) in an agroforestry plantation in the humid tropics of Costa Rica.

• Methods

Fine roots were sampled by soil coring, and a fractal root architecture model parameterised with data from partial root excavations was used for determining coarse root distribution.

• Results

Fine root length in the 0–50 cm soil layer was 26,762 and 22,026 km ha−1 for cocoa and inga, respectively, with 24 % and 23 % of fine root length of cocoa and inga, respectively, in the 0–2 cm layer. Horizontally, root distributions of the two species with cocoa at 3 × 3 m and inga at 9 × 9 m spacing overlapped strongly, while inga did not cover all points at 18 × 18 m spacing.

• Conclusion

Both species seem to efficiently capture nutrients released from the litter layer on the soil surface, and nutrient leaching in shaded cocoa plantations is unlikely. The proximity of root systems may facilitate N exchange between the N2-fixing inga and cocoa, but competition for other nutrients is likely.

Keywords

Agroforestry Fractal networks Organic farming Resource sharing Root architecture Root length 

Notes

Acknowledgments

We thank Mr. Ricardo Palacios, the farm manager, for accommodating our research with cocoa cultivation in the plantations, Mr. Miika Kurppa for supervising the coarse root measuring team and Mr. Oscar Gayle for assisting in fine root sampling and processing.

Funding

The study was funded by the Academy of Finland (grant 129166) and the EARTH University Research Committee.

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Copyright information

© INRA and Springer-Verlag France 2012

Authors and Affiliations

  • Pekka Nygren
    • 1
    • 4
  • Humberto A. Leblanc
    • 2
  • Miaoer Lu
    • 3
  • Cristino A. Gómez Luciano
    • 2
    • 5
  1. 1.Department of Forest SciencesUniversity of HelsinkiHelsinkiFinland
  2. 2.EARTH UniversityLas Mercedes de GuácimoCosta Rica
  3. 3.ESRI Support ServiceRedlandsUSA
  4. 4.Finnish Society of Forest ScienceVantaaFinland
  5. 5.Loma de CabreraDominican Republic

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