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Comparison of water‐use efficiency and internal leaf carbon dioxide concentration in juvenile leaves and phyllodes of Acacia koa (leguminosae) from Hawaii, estimated by two methods
Author(s) -
Hansen David,
Steig Eric
Publication year - 1993
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1993.tb15343.x
Subject(s) - carbon dioxide , juvenile , biology , acacia , water vapor , ecophysiology , water use efficiency , relative humidity , botany , photosynthesis , humidity , ecology , chemistry , physics , organic chemistry , thermodynamics
To gain further insight into comparative ecophysiology of different leaf types, water‐use efficiency (WUE) and internal leaf carbon dioxide concentration (C i ) 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 δ 13 C measurements. Both methods indicate that phyllodes possessed higher WUE and lower C i than juvenile leaves. However, C i predicted by δ 13 C for juvenile leaves and phyllodes was lower than the average gas exchange estimated values of C i and closer to minimal gas exchange estimated values of C i . It is suggested that δ 13 C may be influenced more during times of maximal assimilation and leaf expansion than during maintenance.