How Climate and Vegetation Influence the fire Regime of the Alaskan Boreal Biome: The Holocene Perspective

Hu, Feng Sheng; Brubaker, Linda B.; Gavin, Daniel G.; Higuera, Philip E.; Lynch, Jason A.; Rupp, T. Scott; Tinner, Willy (2006). How Climate and Vegetation Influence the fire Regime of the Alaskan Boreal Biome: The Holocene Perspective. Mitigation and Adaptation Strategies for Global Change, 11(4), pp. 829-846. Springer 10.1007/s11027-005-9015-4

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We synthesize recent results from lake-sediment studies of Holocene fire-climate-vegetation interactions in Alaskan boreal ecosystems. At the millennial time scale, the most robust feature of these records is an increase in fire occurrence with the establishment of boreal forests dominated by Picea mariana: estimated mean fire-return intervals decreased from ≥300 yrs to as low as ∼80 yrs. This fire-vegetation relationship occurred at all sites in interior Alaska with charcoal-based fire reconstructions, regardless of the specific time of P. mariana arrival during the Holocene. The establishment of P. mariana forests was associated with a regional climatic trend toward cooler/wetter conditions. Because such climatic change should not directly enhance fire occurrence, the increase in fire frequency most likely reflects the influence of highly flammable P. mariana forests, which are more conducive to fire ignition and spread than the preceding vegetation types (tundra, and woodlands/forests dominated by Populus or Picea glauca). Increased lightning associated with altered atmospheric circulation may have also played a role in certain areas where fire frequency increased around 4000 calibrated years before present (BP) without an apparent increase in the abundance of P. mariana. When viewed together, the paleo-fire records reveal that fire histories differed among sites in the same modern fire regime and that the fire regime and plant community similar to those of today became established at different times. Thus the spatial array of regional fire regimes was non-static through the Holocene. However, the patterns and causes of the spatial variation remain largely unknown. Advancing our understanding of climate-fire-vegetation interactions in the Alaskan boreal biome will require a network of charcoal records across various ecoregions, quantitative paleoclimate reconstructions, and improved knowledge of how sedimentary charcoal records fire events.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Palaeoecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Tinner, Willy

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

1381-2386

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

13 Jul 2016 13:25

Last Modified:

13 Jul 2016 13:25

Publisher DOI:

10.1007/s11027-005-9015-4

Uncontrolled Keywords:

Alaska; boreal forests; charcoal records; climate change; fire regime; Holocene

BORIS DOI:

10.7892/boris.84197

URI:

https://boris.unibe.ch/id/eprint/84197

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