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CO2 and water fluxes over a rubber tree ecosystem

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Academic year: 2021

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CO2 and water fluxes over a rubber tree ecosystem

Philippe

haler', Pon an

SriPortzpakdeekd, Poonpipope Kasernsop2, Summit f i n j e c

glP

Narueirat C'hairungsee , Boonthida ~ o a i t s u ~ ~ , Olivier ~ o u ~ s u r d ' , Arak ~ h a n t u r n a ~ and Jean- Marc 30nnefond

Abstract :

In Thailand, rubber is the major tree crop covering more

than

2 millions hectares. Its impact on environment, and particularly COz balance and water use, is a major issue.

A complete flux-measuring system has been installed in a 13 years old rubber plantation (clone RRlM 600) in eastern Thailand (Chachoengsao Rubber Research Center, RRIT-DOA) in 2006. Carbon fluxes of rubber plantation ecosystem are continuously meacured by eddy-covariance method (COz exchanges between the ecosystem and the atmosphere). Evapo-transpiration (ET) are measured by eddy-covariance and water balance together and partitioned between tree transpiration and soil evaporation. Sapflow is measured by heat dissipation method (Granier 1985, 1987) using home-made 20 rnm-long radial probes, continuously heated (0.2 W). Meanwhile, amounts of C stored in the trees are evaluated by measuring biomass increment along the life cycle of the plantation, in combination with estimations of the carbon content of the different compartments. These measurements will provide the annual balance of C within plantations at different ages.

Results obtained at ecosystem scale by these methods will be compared to gas exchanges measured at the level of the different comparbnents (canopy, trunk, root system, soil.. .). Particularly, Farquhar' s photosynthesis model (Farquhar et al. 1 980) is parameterized across the canopy. Leaf water potential, sapflow and canopy transpiration are computed to calculate canopy conductivity.

Thereby, validated C 0 2 and H 2 0 fluxes will be used to model gas exchanges of rubber plantation ecosystem according to climate and other environmental parameters as well as crop management.

1 Cirad, UR Plantation Ecosystems, Montpellier France I DORAS Center, Kasetsart University, 10900 Bangkok, Thailand

2 Faculty of Agriculture, Kasetsart University, 10900 Bangkok, Thailand.

3 Chachoengsao Rubber Research Center, RRIT-DOA, Sanam Chai Ket, Thailand 4 INRA, UR EPHYSE, Bordeaux, France.

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