DATA
Two cores were sampled in 2017 from each individual at north and south sides of the stem with an increment borer at approximately 0.5 m stem height to capture growth data since the late 1980s while coring well above areas of growth influenced by the root collar. Ring width values from the two cores per tree were averaged prior to statistical analysis(Sang et. al., 2019). Climate data for provenance origins were based on a 1961-1990 climate 21 normal period that was generated for point locations using the ClimateNA v5.10 software package, available at http://tinyurl.com/ClimateNA, based on methodology described by Wang et al. (2016). Data analysis was carried out using R statistical software.
The box plots reflected the variations within the regions. Lower and upper limits of boxes represent the 25th and 75th percentiles, respectively. The line within the box represents the median of the data. Whiskers represent the largest value no further than 1.5 interquartile range. Data outside the range of the whiskers are considered outliers and are plotted as circles above their respective boxes. There was generally little inconsistency among the DBH and height in all the regions. BC showed the higher inconsistency in the survival rate data reflected by the length of the box. The data also shows that the seedlings from Northern Alberta had somewhat the same survival rate, from the very short box in the data.
The bar charts shows that there were differences in the height of trees and also DBH of trees at 27 years old across the regions reflected by the length of the bars . Generally, the data showed all the trees from the various regions faired relatively well in the common garden for the bar plot of the survival rate of the trees.
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Disclaimer: Part of the data used in this study were fabricated for RENR 580
References
Wang, T. L., Hamann, A., Spittlehouse, D., & Carroll, C. (2016). Locally downscaled and spatially customizable climate data for historical and future periods for North America. PLoS ONE, 11(6), e0156720. https ://doi.org/10.1371/journal.pone.0156720
Sang Z, Sebastian‐Azcona J, Hamann A, Menzel A, Hacke U. Adaptive limitations of white spruce populations to drought imply vulnerability to climate change in its western range. Evol Appl. 2019;12:1850–1860.
Wang, T. L., Hamann, A., Spittlehouse, D., & Carroll, C. (2016). Locally downscaled and spatially customizable climate data for historical and future periods for North America. PLoS ONE, 11(6), e0156720. https ://doi.org/10.1371/journal.pone.0156720
Sang Z, Sebastian‐Azcona J, Hamann A, Menzel A, Hacke U. Adaptive limitations of white spruce populations to drought imply vulnerability to climate change in its western range. Evol Appl. 2019;12:1850–1860.