Abstract
PREMISE: A comparison of methods using different materials to exclude light from stems to prevent stem CO(2) exchange (i.e., photosynthesis), without affecting stem conductance to water vapor, surface temperature, and relative humidity, was conducted on stems of avocado trees in California. METHODS AND RESULTS: The experiment featured three materials: aluminum foil, paper-based wrap, and mineral-based paint. We examined stem CO(2) exchange with and without the light exclusion treatments. We also examined stem surface temperature, relative humidity, and photosynthetic active radiation (PAR) under the cover materials. All materials reduced PAR and stem CO(2) exchange. However, aluminum foil reduced stem surface temperature and increased relative humidity. CONCLUSIONS: Methods used to study stem CO(2) exchange through light exclusion have historically relied on methods that may induce experimental artifacts. Among the methods tested here, mineral-based paint effectively reduced PAR without affecting stem surface temperature and relative humidity around the stem.