Skip to Main Content
Leaf photosynthetic traits scale with hydraulic conductivity and wood density in Panamanian forest canopy trees.Author(s): L.S. Santiago; G. Goldstein; F.C. Meinzer; J.B. Fisher; K. Maehado; D. Woodruff; T. Jones
Source: Oecologia. 140: 543-550
Publication Series: Scientific Journal (JRNL)
PDF: View PDF (619 KB)
DescriptionWe investigated how water transport capacity, wood density and wood anatomy were related to leaf photosynthetic traits in two lowland forests in Panama. Leaf-specific hydraulic conductivity (kL) of upper branches was positively correlated with maximum rates of net CO2, assimilation per unit leaf area (Aarea) and stomatal conductance (gs) across 20 species of canopy trees. Maximum kL showed stronger correlation with Aarea than initial kL suggesting that allocation to photosynthetic potential is proportional to maximum water transport capacity. Terminal branch kL was negatively correlated with Aarea/gs and positively correlated with photosynthesis per unit N, indicating a trade off of efficient use of water against efficient use of N in photosynthesis as water transport efficiency varied. Specific hydraulic conductivity calculated from xylem anatomical characteristics (ktheoretical) was positively related to Aarea and kL, consistent with relationships among physiological measurements. Branch wood density was negatively correlated with wood water storage at saturation, kL, Aarea, net CO2 assimilation per unit leaf mass (Amass), and minimum leaf water potential measured on covered leaves, suggesting that wood density constrains physiological function to specific operating ranges. Kinetic and static indices of branch water transport capacity thus exhibit considerable co-ordination with allocation to potential carbon gain. Our results indicate that understanding tree hydraulic architecture provides added insights to comparisons of leaf level measurements among species, and links photosynthetic allocation patterns with branch hydraulic processes.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- 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.
CitationSantiago, L.S.; Goldstein, G.; Meinzer, F.C.; Fisher, J.B.; Maehado, K.; Woodruff, D.; Jones, T. 2004. Leaf photosynthetic traits scale with hydraulic conductivity and wood density in Panamanian forest canopy trees. Oecologia. 140: 543-550
KeywordsLeaf nitrogen, leaf specific conductivity - stomatal conductance, tropical forest, xylem anatomy
- Integrated responses of hydraulic architecture, water and carbon relations of western hemlock to dwarf mistletoe infection.
- Size-dependent mortality in a Neotropical savanna tree: the role of height-related adjustments in hydraulic architecture and carbon allocation
- Leaf-level gas-exchange uniformity and photosynthetic capacity among loblolly pine (Pinus taeda L.) genotypes of contrasting inherent genetic variation
XML: View XML