Skip to Main Content
Leaf hydraulic architecture correlates with regeneration irradiance in tropical rainforest treesAuthor(s): Lawren Sack; Melvin T. Tyree; N. Michele Holbrook; N. Michele Holbrook
Source: New Phytologist. 167: 403-413.
Publication Series: Miscellaneous Publication
PDF: Download Publication (857.37 KB)
DescriptionThe leaf hydraulic conductance (Kleaf)s a major determinant of plant water transport capacity. Here, we measured Kleaf, and its basis in the resistances of leaf components, for fully illuminated leaves of five tree species that regenerate in deep shade, and five that regenerate in gaps or clearings, in Panamanian lowland tropical rainforest. We also determined coordination with stomatal characters and leaf mass per area. Kleaf varied 10-fold across species, and was 3-fold higher in sun- than in shade-establishing species. On average, 12% of leaf hydraulic resistance (=l/Kleaf) was located in the petiole, 25% in the major veins, 25% in the minorveins, and 39% outside the xylem. Sun-establishing species had a higher proportion of leaf resistance in the xylem. Across species, component resistances correlated linearly with total leaf resistance. Kleaf correlated tightly with indices of stomatal pore area, indicating a coordination of liquid- and vapor-phase conductances shifted relative to that of temperate woody species. Leaf hydraulic properties are integrally linked in the complex of traits that define differences in water use and carbon economy across habitats and vegetation zones.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationSack, Lawren; Tyree, Melvin T.; Holbrook, N. Michele. 2005. Leaf hydraulic architecture correlates with regeneration irradiance in tropical rainforest trees. New Phytologist. 167: 403-413.
KeywordsBarro Colorado Island (BCI), biological networks, high pressure flowmeter (HPFM), leaf hydraulics, shade tolerance, vasculature
- Midday stomatal conductance is more related to stem rather than leaf water status in subtropical deciduous and evergreen broadleaf trees
- Evidence for xylem embolism as a primary factor in dehydration-induced declines in leaf hydraulic conductance
- Stem and leaf hydraulics of congeneric tree species from adjacent tropical savanna and forest ecosystems
XML: View XML