Lakehead University Library Logo
    • Login
    View Item 
    •   Knowledge Commons
    • Electronic Theses and Dissertations
    • Retrospective theses
    • View Item
    •   Knowledge Commons
    • Electronic Theses and Dissertations
    • Retrospective theses
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    quick search

    Browse

    All of Knowledge CommonsCommunities & CollectionsBy Issue DateAuthorTitleSubjectDisciplineAdvisorCommittee MemberThis CollectionBy Issue DateAuthorTitleSubjectDisciplineAdvisorCommittee Member

    My Account

    Login

    Statistics

    View Usage Statistics

    Seasonal changes in gas exchange and foliar nitrogen of three conifer species growing on an Ontario boreal mixedwood site

    Thumbnail

    View/Open

    AndersonA2003m-1b.pdf (14.05Mb)

    Date

    2003

    Author

    Anderson, Amberley J.

    Degree

    Master of Science

    Discipline

    Forestry and the Forest Environment

    Subject

    Ecophysiology (Ontario, Northwestern)
    Seedling growth
    Photosynthesis
    Stomatal conductance
    Foliar nitrogen concentration
    Nitrogen use efficiency
    Canadian boreal forest
    Mixedwood management
    Jack pine, black spruce and white spruce

    Metadata

    Show full item record

    Abstract

    Jack pine, black spruce and white spruce are three vital species of the Ontario boreal mixedwood forest. The purpose of this study is to compare and contrast the ecophysiological characteristics of each species and to examine changes that occur in these characteristics over a growing season. Ecophysiological measurements (photosynthesis, stomatal conductance and transpiration) were taken on six trees each of jack pine, black spruce and white spruce from three blocks, at three times during the growing season (July, August and September). Foliar N concentration was also determined for each measured seedling in July and September. For all three species, photosynthetic rates were highest in September and lowest in July. Overall, rates were consistently highest for jack pine, even in partially shaded conditions. White spruce had its best performance in the lower light conditions, likely due to its shade tolerance. Black spruce performed in between the jack pine and white spruce. Jack pine had the lowest specific leaf areas, nitrogen use efficiencies and the highest water use efficiencies. For all three species, water use efficiency was lowest in July. Foliar nitrogen concentration and photosynthesis were only weakly correlated in this study.

    URI

    http://knowledgecommons.lakeheadu.ca/handle/2453/4025

    Collections

    • Retrospective theses

    Lakehead University Library
    Contact Us | Send Feedback

     


    Lakehead University Library
    Contact Us | Send Feedback