A portable, modular porometer for whole-plant or canopy photosynthetic and respiratory gas exchange estimation is described. The system features within-chamber light and temperature measurement and in its present configuration permits analysis of carbon dioxide and water vapour exchange by an extension of the syringe-based "CO 2 depletion" technique. Operating characteristics of the system and potential modifications are discussed, along with limitations and applications.
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Daley et al. (1984) studied this question.
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