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Forests 2016, 7(4), 83; doi:10.3390/f7040083

Burn Severity Dominates Understory Plant Community Response to Fire in Xeric Jack Pine Forests

Natural Resources Canada, Canadian Forest Service, Northern Forestry Centre Edmonton, Edmonton, AB T6H 3S5, Canada
Author to whom correspondence should be addressed.
Academic Editors: Yves Bergeron and Sylvie Gauthier
Received: 29 February 2016 / Revised: 24 March 2016 / Accepted: 9 April 2016 / Published: 15 April 2016
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Fire is the most common disturbance in northern boreal forests, and large fires are often associated with highly variable burn severities across the burnt area. We studied the understory plant community response to a range of burn severities and pre-fire stand age four growing seasons after the 2011 Richardson Fire in xeric jack pine forests of northern Alberta, Canada. Burn severity had the greatest impact on post-fire plant communities, while pre-fire stand age did not have a significant impact. Total plant species richness and cover decreased with disturbance severity, such that the greatest richness was in low severity burns (average 28 species per 1-m2 quadrat) and plant cover was lowest in the high severity burns (average 16%). However, the response of individual plant groups differed. Lichens and bryophytes were most common in low severity burns and were effectively eliminated from the regenerating plant community at higher burn severities. In contrast, graminoid cover and richness were positively related to burn severity, while forbs did not respond significantly to burn severity, but were impacted by changes in soil chemistry with increased cover at pH >4.9. Our results indicate the importance of non-vascular plants to the overall plant community in this harsh environment and that the plant community is environmentally limited rather than recruitment or competition limited, as is often the case in more mesic forest types. If fire frequency and severity increase as predicted, we may see a shift in plant communities from stress-tolerant species, such as lichens and ericaceous shrubs, to more colonizing species, such as certain graminoids. View Full-Text
Keywords: Pinus banksiana; burn severity; composite burn index; revegetation; forest regeneration; lichen Pinus banksiana; burn severity; composite burn index; revegetation; forest regeneration; lichen

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pinno, B.D.; Errington, R.C. Burn Severity Dominates Understory Plant Community Response to Fire in Xeric Jack Pine Forests. Forests 2016, 7, 83.

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