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Leaf physiology does not predict leaf habit; examples from tropical dry forest

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Brodribb, TJ and Holbrook, NM (2005) Leaf physiology does not predict leaf habit; examples from tropical dry forest. Trees -Structure and Function, 19. pp. 290-295. ISSN 0931-1890

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Abstract

Leaf structure and physiology are thought to be closely linked to leaf longevity and leaf habit. Here we compare the seasonal variation in leaf hydraulic conductance (kleaf ) andwater potential of two evergreen tree species with contrasting leaf life spans, and two species with similar leaf longevity but contrasting leaf habit, one being deciduous and the other evergreen. One of the evergreen species, Simarouba glauca, produced relatively short-lived leaves that maintained high hydraulic conductance year round by periodic flushing. The other evergreen species, Quercus oleoides, produced longer-lived leaves with lower kleaf and as a result minimum leaf water potential was much lower than in S. glauca (−2.8 MPa vs −1.6 MPa). Associated with exposure to lower water potentials, Q. oleoides leaves were harder, had a higher modulus of elasticity, and were less vulnerable to cavitation than S. glauca leaves. Both species operate at water potentials capable of inducing 20 (S. glauca) to 50% (Q. oleoides) loss of kleaf during the dry season although no evidence of cumulative losses in kleaf were observed in either species suggesting regular repair of embolisms. Leaf longevity in the deciduous species Rhedera trinervis is similar to that of S. glauca, although maximum kleaf was lower. Furthermore, a decline in leaf water potential at the onset of the dry season led to cumulative losses in kleaf in R. trinervis that culminated in leaf shedding.

Item Type: Article
Keywords: Embolism . Leaf hydraulic conductance . Leaf water potential . Phenology . Tropical dry forest
Journal or Publication Title: Trees -Structure and Function
Page Range: pp. 290-295
ISSN: 0931-1890
Identification Number - DOI: 10.1007/s00468-004-0390-3
Additional Information: (The original publication is available at www.springerlink.com)
Date Deposited: 29 Nov 2007 21:39
Last Modified: 18 Nov 2014 03:25
URI: http://eprints.utas.edu.au/id/eprint/2594
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