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The Role of Climate Niche, Geofloristic History, Habitat Preference, and Allometry on Wood Density within a California Plant Community

1
Department of Biology, School of Humanities and Sciences, Stanford University, Stanford, CA 94305, USA
2
Department of Integrative Biology, College of Natural Sciences, University of Texas at Austin, Austin, TX 78712, USA
3
Department of Global Ecology, Carnegie Institution for Science, Stanford, CA 94305, USA
4
School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia
5
Department of Integrative Biology, College of Letters & Science, University of California, Berkeley, CA 94720, USA
*
Author to whom correspondence should be addressed.
Forests 2020, 11(1), 105; https://doi.org/10.3390/f11010105
Received: 1 December 2019 / Revised: 21 December 2019 / Accepted: 7 January 2020 / Published: 14 January 2020
(This article belongs to the Special Issue Relationship between Forest Ecophysiology and Environment)
Research Highlights: To better understand within-community variation in wood density, our study demonstrated that a more nuanced approach is required beyond the climate–wood density correlations used in global analyses. Background and Objectives: Global meta-analyses have shown higher wood density is associated with higher temperatures and lower rainfall, while site-specific studies have explained variation in wood density with structural constraints and allometry. On a regional scale, uncertainty exists as to what extent climate and structural demands explain patterns in wood density. We explored the role of species climate niche, geofloristic history, habitat specialization, and allometry on wood density variation within a California forest/chaparral community. Materials and Methods: We collected data on species wood density, climate niche, geofloristic history, and riparian habitat specialization for 20 species of trees and shrubs in a California forest. Results: We found a negative relationship between wood density and basal diameter to height ratio for riparian species and no relationship for non-riparian species. In contrast to previous studies, we found that climate signals had weak relationships with wood density, except for a positive relationship between wood density and the dryness of a species’ wet range edge (species with drier wet range margins have higher wood density). Wood density, however, did not correlate with the aridity of species’ dry range margins. Geofloristic history had no direct effect on wood density or climate niche for modern California plant communities. Conclusions: Within a California plant community, allometry influences wood density for riparian specialists, but non-riparian plants are ‘overbuilt’ such that wood density is not related to canopy structure. Meanwhile, the relationship of wood density to species’ aridity niches challenges our classic assumptions about the adaptive significance of high wood density as a drought tolerance trait.
Keywords: wood density; allometry; functional traits; climate niches wood density; allometry; functional traits; climate niches
MDPI and ACS Style

Nelson, R.A.; Francis, E.J.; Berry, J.A.; Cornwell, W.K.; Anderegg, L.D. The Role of Climate Niche, Geofloristic History, Habitat Preference, and Allometry on Wood Density within a California Plant Community. Forests 2020, 11, 105.

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