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Gaseous exchanges

Gaseous exchanges measurement of young trees

Gaseous exchanges measurement system

 

By day time, the tree captures (CO2) from the air by PHOTOSYNTHESIS and throws back water (H2O) by TRANSPIRATION. The measurements of this GASEOUS EXCHANGES provide information on the plant functioning and status.

Measurement principle

Measurement principle

 

• By photosynthesis and transpiration, the air that gets out of the bag is poorer in carbonic gas CO2 but richer in water H2O.

• From the air flow Q that circulates, and the concentration difference D [CO2]and D[H2O] in and out the bag , we can calculate the gaseous exchanges :

Photosynthesis = Q*Δ[CO2]

Transpiration = Q*Δ[H2O]

Results

 

Irradiation
photosynthesis
Transpiration

 

 

 

Fax : 04 43 76 14 10

Boris.Adam@inrae.fr

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