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Understanding Tundra to Forest Transitions: Spruce Colonization Dynamics

This article explores the two-step process of tundra to forest transitions, emphasizing the colonization of tundra by spruce. The process involves seed dispersal and seedling establishment, leading to tree growth and infilling by neighboring spruce pixels. Fire history plays a crucial role, requiring modifications to seed-seedling ratios based on fire severity. This investigation provides insights into ecological dynamics, essential for understanding climate change impacts on northern ecosystems. Key references include studies by Johnstone & Chapin (2006) and Hobbie & Chapin (1998).

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Understanding Tundra to Forest Transitions: Spruce Colonization Dynamics

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  1. Tundra to forest transitions in ALFRESCO

  2. ALFRESCO 1.0

  3. ALFRESCO 2.0

  4. Tundra to Forest Transition

  5. Tundra to Forest Transition Colonization of tundra by spruce is a two-step process consisting of: • seed dispersal • seedling establishment

  6. Photo: T. Jorgenson Tundra to Forest Transition Once established, infilling of tundra by spruce is also a two-step process consisting of: • tree growth • colonization from within a pixel and/or from neighboring white spruce pixels

  7. Tundra to Forest Transition

  8. Tundra to Forest Transition

  9. Tundra to Forest Transition • If a fire occurred in the past3years, 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)

  10. Tundra to Forest Transition

  11. Tundra to Forest Transition

  12. Tundra to Forest Transition

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