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Figure S1. Total importance value (IV) covered across the eastern United State under current (a), future low CO2 emissions (b), and future high CO2 emissions climate scenarios (c). Lower numbers (red areas) occur in areas where less of the total forest trees were included in the analysis and higher numbers (green areas) occur in areas where more of the total forest trees were included in the analysis.

Figure S2. Relative model confidence for estimates of forest fine root lifespan and turnover rate across the eastern United State under current (a), future low CO2 emissions (b), and future high CO2 emissions climate scenarios (c). Lower numbers (green areas) represent greater confidence while higher numbers (red areas) represent less confidence.

Table S1. Table of all lifespan and turnover estimates for each species along with citations and justification. CDi is the DISTRIB model reliability score and CRi is the confidence estimate for estimates of fine root turnover over and lifespan. Where CRi equals one, the lifespan and or turnover values were taken directly from published literature reporting root dynamics for that species. Where CRi equals two, lifespan estimates were based on estimates from available congeneric species and may have then been adjusted higher or lower based on plant traits (growth rate and/or wood density). Where CRi equals three, first approximations of root lifespan and turnover were generated based on root and whole-plant traits. Original turnover estimates were generated based directly on Eqn (1). Final Adjusted estimates took Eqn (2) into account where appropriate.

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