Allometry measurements and species biomass curve coefficients for the oaks of the Americas 
by Matthew A. Kaproth1,2^; Brett W. Fredickensen1; Antonio González-Rodríguez3; and Jeannine Cavender-Bares1# 

1) Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN 55108, USA
2) Department of Biological Sciences, Minnesota State University Mankato, Mankato, MN 56001, USA
3) Instituto de Investigaciones en Ecosistemas y Sustentabilidad, Universidad Nacional Aut
onoma de Mexico, Antigua Carretera a Patzcuaro No. 8701, Col. Ex Hacienda de San Jose de la Huerta, Morelia, Michoacan 58190, Mexico

^matthew.kaproth@mnsu.edu; #cavender@umn.edu (corresponding authors)

Use with files:
1) Allometry Final Harvest 2012-2015 - measured traits and biomass.csv
Description: Trait and biomass data used to generate allometric equations for modeling growth

2) Allometry Regression Equations 2012-2015.csv
Description: Allometric equations used for modeling plant growth in experimental conditions

To estimate total dry biomass from living aboveground traits, this data set includes equations for 45* American oak species (including hybrids) using up to four functional traits.

Aboveground traits measured per stem: 
1) Longest leaf length (cm) "LL",
2) Number of leaves (total # of leaves across all stems used for allometric models),
3) Stem diameter at root collar (cm) "Stem Diam",
4) Height (cm).

Dry biomass measured:
1) Aboveground (g)
2) Belowground (g),
3) Total (g).

Unless otherwise noted below, all traits were measured using functional trait methods outlined in Cornelissen et al. 2003 Handbook for functional traits or Tyree & Ewers 1991. Zeroes are measured values. Empty cells have no entries (no information to provide). Empty cells are not the same as zeroes. Seedlings were grown under uniform greenhouse conditions, in a mix of potting mix and sand similar to the well-watered treatments described in Kaproth and Cavender-Bares (2016). Plants were destructively harvested over the growing seasons, at different ages, to capture the development of traits over the ontogeny of seedling to 3-year old sapling stages. The majority of plants were planted in 2012 and 2013, and harvested between 2012 and 2015.

Species allometric equations were determined from a minimum of six individuals for all but one species*, with a mean of 26.1 ± 2.5 (SE) individuals per species. Individual traits from the tallest stem (stem 1), and a full factorial product of the four traits, were utilized in the model building. Additionally, all traits were natural log-transformed (LN in an Excel spreadsheet, LOG in SAS). Models fitting total biomass from aboveground traits were determined via stepwise model selection in SAS JMP (v.11). The most biologically-relevant equation was chosen among the lowest of 2 AICc (or BIC) model values. Of the selected models, mean total biomass R-squared fits = 0.84, with a standard error (SE) of ± 0.02. Almost all models had a p-value < 0.0001 (two had p-values > 0.01).

*Q. rugosa had four individuals.

At this date, these data have been used in:
1) Kaproth, M. A., Fredericksen, B. W., González‐Rodríguez, A., Hipp, A. L., & Cavender‐Bares, J. (2023). Drought response strategies are coupled with leaf habit in 35 evergreen and deciduous oak (Quercus) species across a climatic gradient in the Americas. New Phytologist, 239(3), 888–904. https://doi.org/10.1111/nph.19019
2) Kaproth, M. A. & Cavender-Bares J. (2016). Drought tolerance and climatic distributions of the American oaks. International Oaks 27:49-60 https://www.researchgate.net/profile/Matthew_Kaproth/publication/320624057_Drought_Tolerance_and_Climatic_Distributions_of_the_American_Oaks/links/59f209b70f7e9beabfcc5860/Drought-Tolerance-and-Climatic-Distributions-of-the-American-Oaks.pdf

Acknowledgements:
This work was funded by NSF 1146488: Phylogeny of the New World oaks: Diversification of an ecologically important clade across the tropical-temperate divide, awarded to A. Hipp, J. Cavender-Bares, P. Manos, J. Romero-Severson, A. Gonzalez-Rodriguez. We thank these researchers as well as A. Scollard, S. Schnifer, S. Seramur, J. Nockwicki, B. Fredericksen, N. McMann, G. Perez, J. A. Ramirez-Valiente.

Citations noted in descriptions above:

1) Cornelissen J. H. C. , Lavorel S. , Garnier E. , Díaz S. , Buchmann N. , Gurvich D. E. , Reich P. B. , Steege H. ter , Morgan H. D. , Heijden M. G. A. van der , Pausas J. G. Poorter H. (2003) A handbook of protocols for standardised and easy measurement of plant functional traits worldwide. Australian Journal of Botany 51, 335-380. https://doi.org/10.1071/BT02124
2) Tyree, M. T. & Ewers. F. W. (1991). The hydraulic architecture of trees and other woody plants.” New Phytologist 119: 345-360.