A note on carbon dioxide profiles in canopies of mature tea and sugar cane in Uganda

Abstract

Measurements of carbon dioxide concentrations were made at three heights, two inside and one above tea and sugar-cane plantations in Uganda, using an infra-red gas analyser. No systematic difference in CO2 concentration in the atmosphere above and within the tea canopy was observed. There was a large diurnal variation in CO2 concentration above sugar-cane, but the maximum drop in CO2 concentration in the top 30 cm. of the canopy was 25 p.p.m. below atmospheric. The CO2 profiles obtained over sugar-cane were similar to those observed in tall grass and beans (Monteith, 1962) and in corn (Lemon, 1960).