+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Effects of branch height on leaf gas exchange, branch hydraulic conductance and branch sap flux in open-grown ponderosa pine

Effects of branch height on leaf gas exchange, branch hydraulic conductance and branch sap flux in open-grown ponderosa pine

Tree physiology 22(8): 575-581

Recent studies have shown that stomata respond to changes in hydraulic conductance of the flow path from soil to leaf. In open-grown tall trees, branches of different heights may have different hydraulic conductances because of differences in path length and growth. We determined if leaf gas exchange, branch sap flux, leaf specific hydraulic conductance, foliar carbon isotope composition (delta13C) and ratios of leaf area to sapwood area within branches were dependent on branch height (10 and 25 m) within the crowns of four open-grown ponderosa pine (Pinus ponderosa Laws.) trees. We found no difference in leaf gas exchange or leaf specific hydraulic conductance from soil to leaf between the upper and lower canopy of our study trees. Branch sap flux per unit leaf area and per unit sapwood area did not differ between the 10- and 25-m canopy positions; however, branch sap flux per unit sapwood area at the 25-m position had consistently lower values. Branches at the 25-m canopy position had lower leaf to sapwood area ratios (0.17 m(2) cm(-2)) compared with branches at the 10-m position (0.27 m(2) cm(-2)) (P = 0.03). Leaf specific conductance of branches in the upper crown did not differ from that in the lower crown. Other studies at our site indicate lower hydraulic conductance, sap flux, whole-tree canopy conductance and photosynthesis in old trees compared with young trees. This study suggests that height alone may not explain these differences.

(PDF emailed within 0-6 h: $19.90)

Accession: 003739520

Download citation: RISBibTeXText

PMID: 12045029

DOI: 10.1093/treephys/22.8.575

Related references

Hydraulic consequences of climate-driven variation in branch architecture of ponderosa pine. Bulletin of the Ecological Society of America 78(4 SUPPL ): 137, 1997

Effects of tree height on branch hydraulics, leaf structure and gas exchange in California redwoods. Plant, Cell & Environment 32(7): 743-757, 2009

Electrical activities recorded from stem and branch reveal photoperiodic motion and mutual dependence and independence between stem and branch or branch and branch. Plant & Cell Physiology 42(Supplement): s137, 2001

Genome-Wide Association Study Reveals Candidate Genes for Control of Plant Height, Branch Initiation Height and Branch Number in Rapeseed (iBrassica napus L.). Frontiers in Plant Science 8: 1246-1246, 2017

An anatomical assessment of branch abscission and branch-base hydraulic architecture in the endangered Wollemia nobilis. Annals of Botany 99(4): 609-623, 2007

Premature bovine parturition induced by ponderosa pine: effects of pine needles, bark and branch tips. Cornell Veterinarian 80(4): 329-338, 1990

(1) Science Branch: miscellaneous, (ii) Veterinary Services Branch: internal parasites, (iii) Pig Branch: North Queensland area. Report of the Department of Agriculture and Stock, Queensland, Queensland., 63, 69, 91, 1953

The descending septal branch (Bonapace's branch). A case report and literature review of this often forgotten branch. First description in vivo. European Heart Journal 16(10): 1443-1447, 1995

Hydrologic and hydraulic analyses at Akin Branch and Cayce Valley Branch in the Little Bigby Creek watershed, Columbia, Tennessee. Extended Abstracts from, 1992

Daily dynamics of leaf and soil-to-branch hydraulic conductance in silver birch (Betula pendula) measured in situ. Plant Physiology and Biochemistry 68: 104-110, 2014

Modeling for primary branch length and branch diameter of Mongolian Scots Pine trees. Bulletin of Botanical Research 28(2): 244-248, 2008

Spacing, branch size, branch longevity and wood quality in plantations of hoop pine at Yarraman. Technical Paper, Department of Forestry Queensland (12): 17, 1978

Sidebranch patency during main branch stenting: try to keep the branch open immediate and long-term!. Journal of Invasive Cardiology 14(9): 503-504, 2002

Estimating branch dry weight and leaf area from measurements of branch girth in Eucalyptus. Forest Sci 8(2): 132-141, 1962

Transformation of left bundle branch block into simulated bundle branch block after ablation of the right bundle in a patient with branch-to-branch reentry ventricular tachycardia. Archives des Maladies du Coeur et des Vaisseaux 91(1): 73-77, 1998