Repository logo
  • Log In
    New user? Click here to register.Have you forgotten your password?
University College Dublin
    Colleges & Schools
    Statistics
    All of DSpace
  • Log In
    New user? Click here to register.Have you forgotten your password?
  1. Home
  2. UCD Theses
  3. College of Health and Agricultural Sciences
  4. Agriculture and Food Science Theses
  5. Morphological and physiological responses of Fagus sylvatica and Quercus robur seedlings to light availability
 
  • Details
Options

Morphological and physiological responses of Fagus sylvatica and Quercus robur seedlings to light availability

Author(s)
Sevillano, Ignacio  
Advisor(s)
O'Reilly, Conor  
Short, Ian  
Uri
http://hdl.handle.net/10197/8596
Date Issued
2016
Date Available
2017-06-14T08:51:11Z
Abstract
The need to develop forest management systems other than clearfelling has resulted in a requirement for improved understanding of the potential of continuous cover forestry (CCF). One suggested method for the conversion of forest stands into CCF systems and for bringing under-performing forests into productivity is thinning in conjunction with underplanting. This study was an attempt to provide information on species suitability for underplanting of two important trees in European forestry: pedunculate oak (Quercus robur L.) and European beech (Fagus sylvatica L.). To determine the morphological, physiological and growth responses of these two species to different light conditions, beech and oak seedlings previously grown at full light for two years were covered by shading nets that provide different shade levels (62%, 51% or 28% of full light) or continued to be exposed to full light. The different shade levels were intended to mimic a range of underplanted conditions and the process of acclimation to shade was studied to provide information on the ecology and adaptation of underplanted seedlings. In addition to the controlled-shade experiment another study to determine the physiological responses of beech natural regeneration to shade was conducted under natural light conditions (from open gaps to closed canopy).Both oak and beech displayed similar acclimation in response to shade for most of the traits investigated. At the plant level, seedling acclimation to shade included higher biomass allocation to above than below-ground parts and greater energy investment on height than diameter growth. At the leaf level, seedlings grown under shade reduced their leaf thickness and photosynthetic rates per unit area and increased their specific leaf area. This increase in specific leaf area seems to be one mechanism that allows seedlings to perform well under shade conditions. Another acclimation to low light conditions was to increase the efficiency of the photosystem II under shade. Photosynthetic rates were higher and leaves were retained for longer in seedlings grown at full light than under shade. Hence, this probably led to a greater growth in the full light than under shade. Despite this greater growth at full light, the results of this study suggest that beech and oak seedlings would be able to acclimate and perform well if underplanted below overstories that reduce the available light to as low as 28% of full light without having any significant adverse effect on the quality of the final crop.
Type of Material
Doctoral Thesis
Publisher
University College Dublin. School of Agriculture and Food Science
Qualification Name
Ph.D.
Copyright (Published Version)
2016 the author
Subjects

Fagus sylvatica

Growth

Light

Morphology

Physiology

Quercus robur

Web versions
http://dissertations.umi.com/ucd:10120
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
File(s)
Loading...
Thumbnail Image
Name

Sevillano_ucd_5090D_10120.pdf

Size

3.5 MB

Format

Adobe PDF

Checksum (MD5)

bb498e4fb8f081440db408864ccfcdf8

Owning collection
Agriculture and Food Science Theses

Item descriptive metadata is released under a CC-0 (public domain) license: https://creativecommons.org/public-domain/cc0/.
All other content is subject to copyright.

For all queries please contact research.repository@ucd.ie.

Built with DSpace-CRIS software - Extension maintained and optimized by 4Science

  • Cookie settings
  • Privacy policy
  • End User Agreement