poster potential%20for%20change
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https://foothillsri.ca/sites/default/files/Poster-Potential%20for%20Change.pdfTRANSCRIPT
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Growth Form Response
Potential For Change After Mountain Pine Beetle (MPB) Attack: Ecosystem Dynamics During the Early Red Attack Phase
Drs. Anne C.S. McIntosh1 & S. Ellen Macdonald2, 1Alberta Biodiversity Monitoring Institute, 2University of Alberta, Edmonton, AB
• MPB, Dendroctonus ponderosae, is a native bark beetle of western North America pine forests
• However, MPB has expanded its range north & east into Alberta - changing the disturbance regimes for attacked lodgepole pine forests in Alberta
• We are studying relationships between the overstory, understory, & below-ground dynamics of western Alberta lodgepole pine stands (near Robb, AB) with different simulated MPB attack levels and/or forest management:
i. Control
ii. 50% MBP mortality
iii. 100% MPB mortality
iv. Clearcut salvage harvest after MPB attack
• MPB attack was simulated using glyphosate herbicide (applied summer 2009)
• We used a repeated measures randomized block design; overstory, understory, and below-ground data were collected each of 3 summers: pre-treatment (2008), treatment (2009), and post-treatment (2010)
II. RESULTS*
* Subset of results - error bars are SEs, Multivariate plots are non-metric multidimensional scaling ordinations.
5) ACKNOWLEDGEMENTS
For more information contact: [email protected]
V. ACKNOWLEDGEMENTS
• There was short-term resistance to MPB for most understory & below-ground properties during red attack
• Dynamics in the salvage harvested stands followed patterns expected post-harvest and were not resistant
• Salvage logging will push these stands in a potentially very different direction than will the modified
natural disturbance regime that includes MPB
III. CONCLUSIONS
Forest Floor Microbial Community
Understory Plant Community
I. INTRODUCTION & METHODS
Understory
Below-ground
Overstory
Ecosystem Dynamics: Above- & Below- ground Linkages
50% Kill
Clearcut
100% Kill
Control
x 3 Replicate Blocks
Downed Wood
Treatment/Year
Control 50%kill 100%kill Salvage YearDo
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10
20
30
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50
60
70 Pre-treatment
Treatment
Post-treatment
A
AB
B
• McIntosh, A.C.S., Macdonald, S.E.. In press. Short-term
resistance of ecosystem properties and processes to simulated mountain pine beetle attack in a novel region. Ecosphere.
• McIntosh, A.C.S., Macdonald, S.E.. 2013. Potential for lodgepole pine regeneration after mountain pine beetle attack in newly invaded Alberta stands. Forest Ecology and Management, 295: 11-19.
IV. REFERENCES
MPB
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Overstory Basal Area
Community Response
Biomass
Respiration