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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.
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https://hal-bioemco.ccsd.cnrs.fr/bioemco-00539807
Contributor : Alain Pierret <>
Submitted on : Thursday, November 25, 2010 - 11:17:26 AM
Last modification on : Tuesday, June 30, 2020 - 3:04:03 PM

Identifiers

  • HAL Id : bioemco-00539807, version 1
  • PRODINRA : 246954

Citation

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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