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Forests 2018, 9(1), 1; https://doi.org/10.3390/f9010001

Site- and Species-Specific Influences on Sub-Alpine Conifer Growth in Mt. Rainier National Park, USA

1
Department of Biology, University of Washington, Seattle, WA 98195, USA
2
Carnegie Institution for Science, Global Ecology, Stanford, CA 94305, USA
3
Arnold Arboretum of Harvard University, Boston, MA 02130, USA
4
Department of Biology, Tufts University, Medford, MA 02155, USA
*
Author to whom correspondence should be addressed.
Received: 2 October 2017 / Revised: 15 December 2017 / Accepted: 18 December 2017 / Published: 22 December 2017
(This article belongs to the Special Issue Treeline Ecotone Dynamics)
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Abstract

Identifying the factors that influence the climate sensitivity of treeline species is critical to understanding carbon sequestration, forest dynamics, and conservation in high elevation forest/meadow ecotones. Using tree cores from four sub-alpine conifer species collected from three sides of Mt. Rainier, WA, USA, we investigated the influences of species identity and sites with different local climates on radial growth–climate relationships. We created chronologies for each species at each site, determined influential plant-relevant annual and seasonal climatic variables influencing growth, and investigated how the strength of climate sensitivity varied across species and location. Overall, similar climate variables constrained growth on all three sides of the mountain for each of the four study species. Summer warmth positively influenced radial growth, whereas snow, spring warmth, previous summer warmth, and spring humidity negatively influenced growth. We discovered only a few subtle differences in the climate sensitivity of co-occurring species at the same site and between the same species at different sites in pairwise comparisons. A model including species by climate interactions provided the best balance between parsimony and fit, but did not lead to substantially greater predictive power relative to a model without site or species interactions. Our results imply that at treeline in moist temperate regions like Mt. Rainier, the same climatic variables drive annual variation in growth across species and locations, despite species differences in physiology and site differences in mean climates. View Full-Text
Keywords: high elevation conifers; climate sensitivity; tree rings; climatic context; Mt. Rainier National Park; Washington high elevation conifers; climate sensitivity; tree rings; climatic context; Mt. Rainier National Park; Washington
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Legendre-Fixx, M.; Anderegg, L.D.L.; Ettinger, A.K.; HilleRisLambers, J. Site- and Species-Specific Influences on Sub-Alpine Conifer Growth in Mt. Rainier National Park, USA. Forests 2018, 9, 1.

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