tundra to forest transitions in alfresco
DESCRIPTION
Tundra to forest transitions in ALFRESCO. ALFRESCO 1.0. ALFRESCO 2.0. Tundra to Forest Transition. Tundra to Forest Transition. Colonization of tundra by spruce is a two- step process consisting of: seed dispersal - PowerPoint PPT PresentationTRANSCRIPT
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Tundra to forest transitions in ALFRESCO
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ALFRESCO 1.0
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ALFRESCO 2.0
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Tundra to Forest Transition
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Tundra to Forest Transition
Colonization of tundra by spruce is a two-step process consisting of:
1) seed dispersal2) seedling establishment
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Tundra to Forest Transition
Once established, infilling of tundra by spruce is also a two-step process consisting of:
1) tree growth2) colonization from within
a pixel and/or from neighboring white spruce pixels
Photo: T. Jorgenson
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Tundra to Forest Transition
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Tundra to Forest Transition
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Tundra to Forest Transition
If a fire occurred in the past 3 years, modify seed:seedling ratio by severity:• Low, moderate & high canopy, low surface set to 1:50• High canopy, high surface set to 1:10 (Johnstone & Chapin 2006)
All else in undisturbed tundra set to 1:10 (Hobbie & Chapin 1998)
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Tundra to Forest Transition
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Tundra to Forest Transition
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Tundra to Forest Transition