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Author McCulloh, Katherine ♦ Sperry, John S. ♦ Lachenbruch, Barbara ♦ Meinzer, Frederick C. ♦ Reich, Peter B. ♦ Voelker, Steven
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher Wiley
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Life sciences; biology ♦ Physiology & related subjects ♦ Biochemistry ♦ Natural history of organisms ♦ Technology ♦ Medicine & health ♦ Human anatomy, cytology, histology ♦ Human physiology ♦ Pharmacology and therapeutics
Subject Domain (in MeSH) Plant Structures ♦ Anatomy ♦ Eukaryota ♦ Organisms ♦ Inorganic Chemicals ♦ Chemicals and Drugs ♦ Physical Phenomena ♦ Biological Phenomena ♦ Biological Sciences
Subject Keyword Discipline Botany ♦ Coniferophyta ♦ Physiology ♦ Trees ♦ Tropical Climate ♦ Water ♦ Diffusion ♦ Plant Leaves ♦ Plant Stems ♦ Porosity ♦ Wood ♦ Xylem ♦ Comparative Study ♦ Journal Article ♦ Research Support, U.s. Gov't, Non-p.h.s.
Abstract *Coniferous, diffuse-porous and ring-porous trees vary in their xylem anatomy, but the functional consequences of these differences are not well understood from the scale of the conduit to the individual. *Hydraulic and anatomical measurements were made on branches and trunks from 16 species from temperate and tropical areas, representing all three wood types. Scaling of stem conductivity (K(h)) with stem diameter was used to model the hydraulic conductance of the stem network. *Ring-porous trees showed the steepest increase in K(h) with stem size. Temperate diffuse-porous trees were at the opposite extreme, and conifers and tropical diffuse-porous species were intermediate. Scaling of K(h) was influenced by differences in the allometry of conduit diameter (taper) and packing (number per wood area) with stem size. *The K(h) trends were mirrored by the modeled stem-network conductances. Ring-porous species had the greatest network conductance and this value increased isometrically with trunk basal area, indicating that conductance per unit sapwood was independent of tree size. Conductances were lowest and most size-dependent in conifers. The results indicate that differences in conduit taper and packing between functional types propagate to the network level and have an important influence on metabolic scaling concepts.
Description Country affiliation: United States
Author Affiliation: McCulloh K ( Department of Wood Science and Engineering, Oregon State University, Corvallis, OR 97330, USA. kate.mcculloh@oregonstate.edu)
ISSN 0028646X
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2010-04-01
Publisher Place Great Britain (UK)
e-ISSN 14698137
Journal New Phytologist
Volume Number 186
Issue Number 2


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Source: WHO-Global Index Medicus