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Physiological and isotopic (delta(13)C and delta(18)O) responses of three tropical tree species to water and nutrient availability

Cernusak, Lucas A., Winter, K. and Turner, Benjamin L. (2009). Physiological and isotopic (delta(13)C and delta(18)O) responses of three tropical tree species to water and nutrient availability. Plant, Cell and Environment,32(10):1441-1455.

Document type: Journal Article
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Title Physiological and isotopic (delta(13)C and delta(18)O) responses of three tropical tree species to water and nutrient availability
Author Cernusak, Lucas A.
Winter, K.
Turner, Benjamin L.
Journal Name Plant, Cell and Environment
Publication Date 2009
Volume Number 32
Issue Number 10
ISSN 0140-7791   (check CDU catalogue  open catalogue search in new window)
Start Page 1441
End Page 1455
Total Pages 15
Place of Publication UK
Publisher Wiley-Blackwell Publishing Ltd.
HERDC Category C1 - Journal Article (DEST)
Abstract Water-use efficiency and stable isotope composition were studied in three tropical tree species. Seedlings of Tectona grandis, Swietenia macrophylla and Platymiscium pinnatum were grown at either high or low water supply, and with or without added fertilizer. These three species previously exhibited low, intermediate and high whole-plant water-use efficiency (TE) when grown at high water supply in unfertilized soil. Responses of TE to water and nutrient availability varied among species. The TE was calculated as experiment-long dry matter production divided by cumulative water use. Species-specific offsets were observed in relationships between TE and whole-plant (13)C discrimination (Delta(13)C(p)). These offsets could be attributed to a breakdown in the relationship between Delta(13)C(p) and the ratio of intercellular to ambient CO(2) partial pressures (c(i)/c(a)) in P. pinnatum, and to variation among species in the leaf-to-air vapour pressure difference (v). Thus, a plot of v.TE against c(i)/c(a) showed a general relationship among species. Relationships between delta(18)O of stem dry matter and stomatal conductance ranged from strongly negative for S. macrophylla to no relationship for T. grandis. Results suggest inter-specific variation among tropical tree species in relationships between stable isotope ratios (delta(13)C and delta(18)O) and the gas exchange processes thought to affect them.
 
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Created: Wed, 24 Mar 2010, 14:28:22 CST by Sarena Wegener