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UBC Theses and Dissertations
Quantifying the effects of different clear-cut sizes on ectomycorrhizal fungi at a subalpine forest : persistence and diversity Hagerman, Shannon Marie
Abstract
The overall objective of this thesis was to assess the influence of different clear-cut sizes on the survival of ectomycorrhizal fungi one and two growing seasons after logging. A comparative study involving a greenhouse bioassay and a survey of ectomycorrhizal roots from soil cores detected very different assemblages of the ectomycorrhizal fungal community one growing season after host removal. These differences are thought to be the result of variation in fungal activity and differences in epidemiology. Two growing seasons after host removal, a survey of ectomycorrhizal roots from soil cores revealed that both the numbers of active ectomycorrhizae and the diversity of ectomycorrhizae were significantly reduced at clear-cut plots relative to the undisturbed forest. Specifically, there was a significant decrease in diversity with increasing distance from the block edge. There were no differences in diversity at the same distance from the edge of different sized clear-cuts. A field bioassay showed that the diversity of ectomycorrhizal fungi capable of colonizing young spruce seedlings two growing seasons after host removal was significantly reduced with distance from the block edge. The critical distance beyond which diversity decreased was 16 - 25m. As with the results of the survey of ectomycorrhizae from soil cores, there were no differences in diversity at the same distance from the edge of different sized clear-cuts. These results suggest that, in clear-cuts ranging in size from 0.1 to 10 ha, distance from the edge, or proximity to overstory trees, is more important to patterns of ectomycorrhizal persistence and diversity than opening size. The use of vital stains revealed that fungal tissue associated with 'active' mycorrhizae is viable yet not metabolically active.
Item Metadata
Title |
Quantifying the effects of different clear-cut sizes on ectomycorrhizal fungi at a subalpine forest : persistence and diversity
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1997
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Description |
The overall objective of this thesis was to assess the influence of different clear-cut
sizes on the survival of ectomycorrhizal fungi one and two growing seasons after
logging. A comparative study involving a greenhouse bioassay and a survey of
ectomycorrhizal roots from soil cores detected very different assemblages of the
ectomycorrhizal fungal community one growing season after host removal. These
differences are thought to be the result of variation in fungal activity and differences in
epidemiology. Two growing seasons after host removal, a survey of ectomycorrhizal
roots from soil cores revealed that both the numbers of active ectomycorrhizae and the
diversity of ectomycorrhizae were significantly reduced at clear-cut plots relative to the
undisturbed forest. Specifically, there was a significant decrease in diversity with
increasing distance from the block edge. There were no differences in diversity at the
same distance from the edge of different sized clear-cuts. A field bioassay showed that
the diversity of ectomycorrhizal fungi capable of colonizing young spruce seedlings
two growing seasons after host removal was significantly reduced with distance from
the block edge. The critical distance beyond which diversity decreased was 16 - 25m.
As with the results of the survey of ectomycorrhizae from soil cores, there were no
differences in diversity at the same distance from the edge of different sized clear-cuts.
These results suggest that, in clear-cuts ranging in size from 0.1 to 10 ha, distance
from the edge, or proximity to overstory trees, is more important to patterns of
ectomycorrhizal persistence and diversity than opening size. The use of vital stains
revealed that fungal tissue associated with 'active' mycorrhizae is viable yet not
metabolically active.
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Extent |
7082831 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-25
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0087801
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1997-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.