Abstract
To gain further insight into comparative ecophysiology of different leaf types, water-use efficiency (WUE) and internal leaf carbon dioxide concentration (Ci) were estimated in the field for juvenile leaves and phyllodes of Acacia koa by carbon dioxide and water vapor exchange using a closed system infrared gas analyzer and humidity sensor, and by δ13C measurements. Both methods indicate that phyllodes possessed higher WUE and lower Ci than juvenile leaves. However, Ci predicted by δ13C for juvenile leaves and phyllodes was lower than the average gas exchange estimated values of Ci and closer to minimal gas exchange estimated values of Ci. It is suggested that δ13C may be influenced more during times of maximal assimilation and leaf expansion than during maintenance.
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