Search Results

1 results returned.
To copy the URL of a document, Right Click on the document title, select "Copy Shortcut/Copy Link", then paste as needed. Only documents available to the public have this feature enabled.
Title Sort descending Sort ascending Primary
Author Sort ascending Sort descending
Date Sort ascending Sort descending
Abstract / Details
View
Hard
copy
Ectomycorrhizae and networks: their role in facilitating Douglas-fir regeneration under water, site and climatic stresses Simard, Suzanne W.
2007
A
D

39K
Abstract: This project fits the FSP 'Timber Growth and Value' program, '1.0 Basic Research on tree growth and stand development' theme and '1.1 Complex stands' topic. This project investigates the role of ectomycorrhizae (ECM) and common mycorrhizal networks (CMNs) in facilitating Douglas-fir regeneration, growth and young stand development in the Interior Cedar Hemlock and Interior Douglas-fir zones of British Columbia. It includes four graduate student studies under the joint supervision of the core team members. Study 1: The role of common mycelial networks in facilitating artificial and natural regeneration of Douglas-fir This study is being carried out as part of François Teste?s PhD research under the supervision of Simard, Durall, Jones, and Berch. The specific objectives are: (1) to examine the influence of green tree size and proximity on Douglas-fir regeneration, and (2) to determine whether the importance of the common mycorrhizal network to Douglas-fir establishment increases with site disturbance. To meet objective 1 in Study 1, Douglas-fir was planted and seeded into forest gaps in the neighbourhood of (1) advance regeneration that varied in size, or (2) retained trees that varied in proximity. The size study is being conducted in a clearcut opening, and the proximity study in six separate Douglas-fir openings north of Kamloops, BC. Non-mycorrhizal (NM) Douglas-fir seedlings grown at UBC were out-planted in April, 2004, along with seed in treatments with and without mesh barriers that restricted ECM hyphae (to separate CMN from non-CMN effects). In each experiment the following treatments were applied: (1) size effects - located in the neighbourhood of different sized advance Douglas-fir regeneration; and (2) proximity effects - located at different distances from mature Douglas-fir trees. Over the next two growing seasons, we will measure seedling water stress, photosynthesis, transpiration, and relative growth rate. After the third growing season, we will apply dual isotope (13C/14C) labeling to quantify bi-directional transfer between Douglas-fir and neighbours. We will harvest the remaining replicates for biomass, nutrient content, wood NA 13C, root morphology, and ECM using morphological and molecular techniques. Data will be analyzed using the regression and model selection approaches. For objective 2 in Study 1, we are using the Long-Term Soil Productivity Study (LTSP) to test CMN effects on seedling establishment across levels of soil disturbance in a drought-limited environment. Seedlings, with and without CMN-restricting mesh, were planted into three treatments: (a) no compaction (C)/no forest floor removal (FFR), (b) no C/FFR, (c) no C/FFR and mineral soil removed, representing gradients of increasing organic matter removal. In May, 2004, NM Douglas-fir were out-planted into these treatments near (0.5 m) transplanted advance Douglas-fir. Near the end of each of two growing seasons, we will assess seedling water stress, foliar nutrients, and growth. We will then quantify bi-directional C transfer using 13C/14C as above, and the remaining pairs will be harvested for biomass, nutrient content, wood NA 13C, root morphology, and ECM using morphological and molecular techniques. Data will be analysed using Mixed Model Procedure for a split-plot design. Study 2: The role of ectomycorrhizal fungi in interspecific carbon transfer between birch and Douglas-fir This study is being carried out as part of Leanne Philip?s PhD research under the supervision of Drs. Simard and Jones. The specific objectives are: (1) To determine the importance of hyphal pathways relative to other pathways in the transfer of carbon between paper birch and Douglas-fir in the lab and field, (2) To determine whether the magnitude and direction of carbon transfer between paper birch and Douglas-fir changes with the phenology of the tree species. Achieving these objectives involved two lab studies, one where two-way carbon transfer was examined ...
 
Simard, Suzanne W., Teste, Francois P.; Karst, Justine; Jones, Melanie D.; Durall, Daniel M.; Hagerman, Shannon M.; Sachs, Donald L.; Heineman, Jean L.; Mather, W. Jean; Vyse, Alan. 2007. Ectomycorrhizae and networks: their role in facilitating Douglas-fir regeneration under water, site and climatic stresses. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2007MR369
 
Topic: FLNRORD Research Program
Keywords: Forest, Investment, Account, (FIA), Ectomycorrhizae, Pseudotsuga, Menziesii, Reproduction, British, Columbia, Interior, Growth
ISSN:  Scientific Name: 
ISBN:  English Name: 
Other Identifier: 
 
To copy the URL of a document, Right Click on the document title, select "Copy Shortcut/Copy Link", then paste as needed. Only documents available to the public have this feature enabled.

EIRS Search Options

Useful Contacts