Growth dynamics of fine Hevea brasiliensis roots along a 4.5-m soil profile

Abstract : To monitor root growth dynamics of rubber trees (RRIM 600) along a deep soil profile, a permanent access-well ~ 4.5 m deep was built and operated since the end of 2006. This facility allows the direct observation of root growth dynamics using so-called “root windows”, through which roots can be observed at regular time intervals. Using this access-well, we could estimate root length density and the decay of root tissues at various soil depths. Initial results were based on a 17-month observation. Some root incubations were also conducted for one year. Result from these experiments indicated that: A root growth peak occurred between May and June at a soil depths shallower than 150 cm, while it generally did not occur before November deeper in the soil profile; - Fine roots growing at all depths had a life expectancy of months rather than weeks and a large proportion survived for 12 to 17 months without showing any clear sign of senescence; - Fine root length density decreased by more than one order of magnitude from 5 to 50 cm while fine root biomass found below 100 cm still accounted for more than a third of the overall fine root biomass of the studied rubber trees; - The decay rate of dead root material at a soil depth of 400 cm was slow, with a half-life on the order of 21 months. Together with long fine roots' survival, this indicates that the residence time of carbon originating from fine rubber tree roots spans several years.
Type de document :
Article dans une revue
Khon Kaen Agriculture Journal, 2010, 37, pp.265-276
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Contributeur : Alain Pierret <>
Soumis le : jeudi 25 novembre 2010 - 11:17:26
Dernière modification le : jeudi 22 novembre 2018 - 14:09:35


  • HAL Id : bioemco-00539807, version 1


Santimaitree Gonkhamdee, Jean-Luc Maeght, Frederic Do, Alain Pierret. Growth dynamics of fine Hevea brasiliensis roots along a 4.5-m soil profile. Khon Kaen Agriculture Journal, 2010, 37, pp.265-276. 〈bioemco-00539807〉



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