Post-Fire Tree Establishment Patterns at the Alpine Treeline Ecotone: Mount Rainier National Park, Washington, USA

Post-Fire Tree Establishment Patterns at the Alpine Treeline Ecotone: Mount Rainier National Park, Washington, USA

Questions: Does tree establishment: (1) occur at a treeline depressed by fire, (2) cause the forest line to ascend upslope, and/or (3) alter landscape heterogeneity? (4) What abiotic and biotic local site conditions are most important in structuring establishment patterns? (5) Does the abiotic setti...

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Veröffentlicht in:Journal of Vegetation Science. - Opulus Press. - 20(2009), 1, Seite 107-120
1. Verfasser: Stueve, Kirk M. (VerfasserIn)
Weitere Verfasser: Cerney, Dawna L., Rochefort, Regina M., Kurth, Laurie L.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2009
Zugriff auf das übergeordnete Werk:Journal of Vegetation Science
Schlagworte:Abies lasiocarpa CORONA Hierarchical partitioning Landscape Pacific Northwest Seed dispersal Spatial autocorrelation Subalpine parkland Topography Biological sciences Physical sciences
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245 1 0 |a Post-Fire Tree Establishment Patterns at the Alpine Treeline Ecotone: Mount Rainier National Park, Washington, USA 
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520 |a Questions: Does tree establishment: (1) occur at a treeline depressed by fire, (2) cause the forest line to ascend upslope, and/or (3) alter landscape heterogeneity? (4) What abiotic and biotic local site conditions are most important in structuring establishment patterns? (5) Does the abiotic setting become more important with increasing upslope distance from the forest line? Location: Western slopes of Mount Rainier, USA. Methods: We performed classification analysis of 1970 satellite imagery and 2003 aerial photography to delineate establishment. Local site conditions were calculated from a LIDAR-based DEM, ancillary climate data, and 1970 tree locations in a GIS. We used logistic regression on a spatially weighted landscape matrix to rank variables. Results: Considerable establishment after 1970 caused forest line elevation to increase over 150 m in specific locations. Landscape heterogeneity increased with distance from the 1970 forest line. At a broad spatial context, we found establishment was most common near existing trees (0-50 m) and at low elevations (1250-1350 m). Slope aspect (W, NW, N, NE, and E), slope angle (40-60°) , and other abiotic factors emerged as important predictors of establishment with increasing upslope distance from the forest line to restricted spatial extents. Conclusions: Favorable climatic conditions likely triggered widespread tree establishment. Readily available seed probably enhanced establishment rates near sexually mature trees, particularly in the less stressful environment at low elevations. The mass effect of nearly ubiquitous establishment in these areas may have obscured the importance of the abiotic setting to restricted spatial extents. Topographic variability apparently produced favorable sites that facilitated opportunistic establishment with increasing upslope distance from the forest line, thereby enabling additional trees to invade the alpine tundra. 
540 |a Copyright 2009 International Addocation for Vegetation Science 
650 4 |a Abies lasiocarpa 
650 4 |a CORONA 
650 4 |a Hierarchical partitioning 
650 4 |a Landscape 
650 4 |a Pacific Northwest 
650 4 |a Seed dispersal 
650 4 |a Spatial autocorrelation 
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650 4 |a Topography 
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650 4 |a Biological sciences  |x Biology  |x Botany  |x Dendrology  |x Trees 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plant ecology  |x Forest ecology 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Topography  |x Topographical elevation 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Land  |x Landscapes 
650 4 |a Biological sciences  |x Ecology  |x Population ecology  |x Synecology  |x Biocenosis  |x Plant communities  |x Forests  |x Montane forests 
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650 4 |a Biological sciences  |x Biology  |x Botany  |x Plant ecology  |x Vegetation 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Topography  |x Topographical aspect 
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700 1 |a Cerney, Dawna L.  |e verfasserin  |4 aut 
700 1 |a Rochefort, Regina M.  |e verfasserin  |4 aut 
700 1 |a Kurth, Laurie L.  |e verfasserin  |4 aut 
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