Skip Navigation

This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow E-letters: Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when E-letters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (67)
Right arrowRequest Permissions
Right arrow Disclaimer
Google Scholar
Right arrow Articles by Pataki, D.
Right arrow Articles by Phillips, N.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Pataki, D.
Right arrow Articles by Phillips, N.
Agricola
Right arrow Articles by Pataki, D.
Right arrow Articles by Phillips, N.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Experimental Botany, Vol 49, 871-878, Copyright © 1998 by Oxford University Press

ARTICLES

Responses of sap flux and stomatal conductance of Pinus taeda L. trees to stepwise reductions in leaf area

D Pataki, R Oren and N Phillips
Nicholas School of the Environment, Duke University, Durham, NC 27708, USA; Corresponding author; e-mail: ramoren@duke.edu

Herbivory or artificial foliage removal has been shown to affect gas exchange and canopy water relations. In this study, canopy architecture and water relations in response to progressive defoliation were examined in a stand of 8-year-old loblolly pine (Pinus taeda L.) trees, a shade-intolerant, pioneer species common in the south-eastern USA. Sap flux was measured with constant heat sap flow gauges in order to estimate canopy stomatal conductance (Gs) while foliage in the 6 m high stand was harvested in 1 m increments from the bottom up. Leaf-level stomatal conductance and water potential data were also collected. Profiles of silhouette area ratio and specific leaf area showed no trends with crown height, reflecting an open canopy (leaf area index = 1.55). Therefore, short-term changes in Gs with foliage removal were attributed to hydraulic effects rather than influences of changes in mean microclimate conditions on Gs of remaining foliage. A large increase in Gs was observed during the 6 h pruning period which fully compensated for the reductions in foliage area down to 45%. Canopy stomatal conductance and whole plant liquid phase conductance as calculated from sap flux were both influenced by the rate of growth as indicated by the annual basal area increment.Keywords: Canopy stomatal conductance, defoliation, hydraulic conductance, sap flux, stomatal conductance.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 J Exp BotHome page
M. J. Clearwater, R. G. Lowe, B. J. Hofstee, C. Barclay, A. J. Mandemaker, and P. Blattmann
Hydraulic conductance and rootstock effects in grafted vines of kiwifruit
J. Exp. Bot., June 1, 2004; 55(401): 1371 - 1382.
[Abstract] [Full Text] [PDF]

Home page
 J Exp BotHome page
P. J. Schulte and J. R. Brooks
Branch junctions and the flow of water through xylem in Douglas-fir and ponderosa pine stems
J. Exp. Bot., June 1, 2003; 54(387): 1597 - 1605.
[Abstract] [Full Text] [PDF]

Home page
 Crop Sci.Home page
S. V. Angadi and M. H. Entz
Water Relations of Standard Height and Dwarf Sunflower Cultivars
Crop Sci., January 1, 2002; 42(1): 152 - 159.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.