Journal of Oil Palm Research Vol. 11 No. 1  1999 June p.  33-40

Notes on oil palm productivity. IV. Carbon dioxide gradients and fluxes and evapotranspiration, above and below the canopy

Author(s): HENSON I E*

Continuous measurements of atmospheric COconcentrations made at various heights within and above a mature oil palm canopy showed that concentrations varied widely during the course of a 24-hour period – building up to high levels overnight within the canopy and falling rapidly with the onset of photosynthesis in the morning. Measurement of CO2 fluxes, both within the atmospheric boundary layer above the canopy and within the trunk space, allowed the relative contribution of CO2 supplied from the above and below-canopy atmosphere to the total canopy CO2 assimilation to be assessed. Similar assessment of water vapour fluxes provided a measure of the percentage of water lost as evapotranspiration (ET) which was channelled through the palms. Below-canopy CO2 uptake averaged 18.5% of the above-canopy flux and 15.6% to total flux. Evapotranspiration from the ground (from soil and ground flora) was almost 13% of total evapotranspiration, so that over 87% of ET took place directly from the palm canopy.

Keywords: , , ,

Author Information
* Palm Oil Research Institute of Malaysia, P.O. Box 10620, 50720 Kuala Lumpur, Malaysia.

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