Natural causes of the tundra-taiga boundary
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Updated: Sep 29, 2026

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
Published on: July 3, 2016
Bjartmar Sveinbjörnsson1, Annika Hofgaard, Andrea Lloyd
1Department of Biological Sciences, University of Alaska Anchorage, 3211 Providence Drive, Anchorage, AK 99508, USA. afbs@uaa.alaska.edu
Abstract:
The tundra-taiga interface is characterized by a change in tree cover or density, tree size and shape, tree growth, and reproduction. Generally, trees get denser, taller, and less damaged as one moves from the tundra into the taiga proper. The environmental covariates and possible mechanisms resulting in these patterns are addressed in the paper. Low seed rain density, lack of safe sites caused by microclimatic variation, low surface substrate moisture, and low soil nutrient availability may limit the density of the tree species. Tree growth may be limited by a short growing season and further diminished, by shoot and root damage reducing carbon and nutrient stores as well as by reducing carbon and nutrient uptake capacities. Positive and negative feedbacks of tree density on tree growth exist at treeline. Increased tree density leads to increased air temperature and decreased wind damage, but also to lower soil temperature, reduced nutrient availability, and greater nutrient competition.
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