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A field portable gas‐exchange system for measuring carbon dioxide and water vapour exchange rates of leaves during fumigation with SO 2
Author(s) -
ATKINSON C. J.,
WINNER W. E.,
MOONEY H. A.
Publication year - 1986
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1986.tb02103.x
Subject(s) - cuvette , carbon dioxide , water vapor , chemistry , transpiration , humidity , fumigation , analytical chemistry (journal) , relative humidity , photosynthesis , carbon monoxide , environmental chemistry , thermodynamics , agronomy , biochemistry , physics , organic chemistry , quantum mechanics , catalysis , biology
A field portable, steady‐state gas‐exchange system which measures both CO 2 and water vapour exchange of single intact leaves during fumigations with SO 2 is described. Within the leaf cuvette temperature, light, humidity and both CO 2 and SO 2 concentrations are controlled to preset levels. Gas flow and concentrations are controlled by mass flow controllers. Photosynthetic uptake of CO 2 can be determined either by differential depletion or null balance measurement. Water vapour exchange is measured differentially and transpiration and conductance to water vapour determined. Sulphur dioxide is measured directly within the cuvette exhaust gas line by UV‐pulse fluorescence. The performance of this system under field conditions is described and the physiological measurements compared with those obtained with other systems.